BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Dissipative Super Fluid Dynamics from Gravity
DTSTART;VALUE=DATE-TIME:20090217T103000Z
DTEND;VALUE=DATE-TIME:20090217T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1176@cern.ch
DESCRIPTION:We use the AdS/CFT correspondence to compute the effective equ
ations of super fluid dynamics in a particular model including dissipative
terms at first order in the derivative expansion and at non negligible su
perfluid velocities. Our results turn out not to quite fit within the appa
rently standard 13 parameter Putterman formalism for dissipative terms in
superfluidity. Purely within fluid dynamics we generalize Putterman's form
alism to a 14 parameter set of equations. Our gravitational results fit pe
rfectly into the revised formalism.\n\nhttps://indico.tifr.res.in/indico/c
onferenceDisplay.py?confId=1176
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1176
END:VEVENT
BEGIN:VEVENT
SUMMARY:Randomized Wilson loops\, reduced models and the large D expansion
DTSTART;VALUE=DATE-TIME:20090228T103000Z
DTEND;VALUE=DATE-TIME:20090228T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1207@cern.ch
DESCRIPTION:Oleg Evnin\n\nhttps://indico.tifr.res.in/indico/conferenceDisp
lay.py?confId=1207
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1207
END:VEVENT
BEGIN:VEVENT
SUMMARY: Godel space from wrapped M2-branes
DTSTART;VALUE=DATE-TIME:20091023T103000Z
DTEND;VALUE=DATE-TIME:20091023T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-156@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
156
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=156
END:VEVENT
BEGIN:VEVENT
SUMMARY:Calabi-Yau Metrics for Dummies
DTSTART;VALUE=DATE-TIME:20091026T103000Z
DTEND;VALUE=DATE-TIME:20091026T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-157@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
157
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=157
END:VEVENT
BEGIN:VEVENT
SUMMARY:One dimensional Large-N gauge theory in a 1/D expansion
DTSTART;VALUE=DATE-TIME:20091109T103000Z
DTEND;VALUE=DATE-TIME:20091109T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-191@cern.ch
DESCRIPTION:We study a dimensional reduction of d+D dimensional large-N YM
theory to d dimension\, especially d=0 and d=1 case. Then the theory is
described by d dimensional gauge field and D adjoint scalars. We take a l
arge D limit and evaluate the path-integral by expanding 1/D. Then we fin
d a non-trivial vacuum characterized by a mass gap for the adjoint scalars
.\n\nIn d=0 case\, we obtain an exact expression for the partition functio
n up to 1/D in finite N. In d=1 case\, we derived an effective action for
the gauge field and showed the existence of the confinement/deconfinment
phase transition. Remarkably we can sum over all loop correction in 1/D o
rder and our results reproduce numerical results even in the strong 'tHoof
t coupling region. We will also discuss the gravity interpretation of our
results.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId
=191
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=191
END:VEVENT
BEGIN:VEVENT
SUMMARY:Review of the papers by V.Pestun and S.Giombi `Wilson\, 't Hooft
loop correlators of N=4 SYM from bosonic 2d YM and matrix models' (arXiv:
0906.1572\, arXiv:0909.4272)
DTSTART;VALUE=DATE-TIME:20091113T103000Z
DTEND;VALUE=DATE-TIME:20091113T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-231@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
231
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=231
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-SUSY infrared perturbations to the warped deformed conifold an
d Holographic Gauge Mediation
DTSTART;VALUE=DATE-TIME:20091116T103000Z
DTEND;VALUE=DATE-TIME:20091116T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-232@cern.ch
DESCRIPTION:We present non-supersymmetric\, isometry-preserving perturbati
ons to the infrared region of the warped deformed conifold\, i.e. Klebanov
-Strassler solution. One of these solutions can be interpreted as placing
a number of anti D3-branes at the tip. We argue that perturbations cannot
break imaginary self-dual condition unless the internal geometry is "squas
hed". We also consider a relative of semi-direct gauge mediation where the
hidden sector exists at large 't Hooft coupling using the supersymmetry b
reaking solutions including the effect of anti D3. Such a scenario is diff
icult to describe using traditional field theory\, but is amendable to the
techniques of gauge/gravity duality.\n\nhttps://indico.tifr.res.in/indico
/conferenceDisplay.py?confId=232
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=232
END:VEVENT
BEGIN:VEVENT
SUMMARY:The non-relativistic limit of AdS/CFT
DTSTART;VALUE=DATE-TIME:20091210T103000Z
DTEND;VALUE=DATE-TIME:20091210T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-279@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
279
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=279
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giant Magnons for SYM and ABJM Theories
DTSTART;VALUE=DATE-TIME:20091211T103000Z
DTEND;VALUE=DATE-TIME:20091211T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-299@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
299
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=299
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black Holes in Fourth Order Gravity
DTSTART;VALUE=DATE-TIME:20091217T060000Z
DTEND;VALUE=DATE-TIME:20091217T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-338@cern.ch
DESCRIPTION:As we know\, in order to fit the standard model of cosmology\,
which is based on General Relativity coupled to standard matter (baryons
and radiation)\, the introduction of two dark components (matter and energ
y) are needed to achieve a consistent picture. To get over this problem of
having ``exotic matter fields''\, one of the theoretical proposals that h
as received a considerable amount of attention recently\, is that Dark Ene
rgy has a geometrical origin. Most of the work on this idea has focused on
``fourth order gravity''\, in which the standard Hilbert-Einstein action
is modified with terms that are at most of order four in the metric tensor
. However\, it is not very well understood as to how these modifications c
hange the standard spherically symmetric solutions of GR. In this talk I
would discuss a new covariant formalism to treat spherically symmetric spa
cetimes in $f(R)$ theories of gravity. Using this formalism we can determi
ne the\nconditions on the function $f$ for which the Schwarzschild metric
is the only vacuum solution with vanishing Ricci scalar. We can also show
that this general framework provides a clear way of showing that the Schw
arzschild solution is not a unique static spherically symmetric solution\,
providing some insights on how the current form of Birkhoff's theorem bre
aks down for these theories.\n\nhttps://indico.tifr.res.in/indico/conferen
ceDisplay.py?confId=338
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=338
END:VEVENT
BEGIN:VEVENT
SUMMARY:CFTS Dual to Charged BTZ black-hole
DTSTART;VALUE=DATE-TIME:20100120T060000Z
DTEND;VALUE=DATE-TIME:20100120T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-424@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
424
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=424
END:VEVENT
BEGIN:VEVENT
SUMMARY:Large N Volume Independence in Confining and Conformal Theories
DTSTART;VALUE=DATE-TIME:20100122T103000Z
DTEND;VALUE=DATE-TIME:20100122T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-423@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
423
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=423
END:VEVENT
BEGIN:VEVENT
SUMMARY:Universal Phenomena in Strongly Coupled Gauge Theories and Gravity
DTSTART;VALUE=DATE-TIME:20100122T093000Z
DTEND;VALUE=DATE-TIME:20100122T103000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-431@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
431
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=431
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic Anyons in the ABJM theory
DTSTART;VALUE=DATE-TIME:20100129T103000Z
DTEND;VALUE=DATE-TIME:20100129T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-460@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
460
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=460
END:VEVENT
BEGIN:VEVENT
SUMMARY:Indices for superconformal Chern-Simons theories
DTSTART;VALUE=DATE-TIME:20100201T103000Z
DTEND;VALUE=DATE-TIME:20100201T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-467@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
467
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=467
END:VEVENT
BEGIN:VEVENT
SUMMARY: Quiver Chern-Simons Theories\, D3-branes and Lorentzian Lie 3-alg
ebras
DTSTART;VALUE=DATE-TIME:20100202T060000Z
DTEND;VALUE=DATE-TIME:20100202T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-468@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
468
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=468
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Monopole Index for N=4 Chern-Simons Theories
DTSTART;VALUE=DATE-TIME:20100205T103000Z
DTEND;VALUE=DATE-TIME:20100205T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-469@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
469
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=469
END:VEVENT
BEGIN:VEVENT
SUMMARY:Giant Magnons for SYM and ABJM Theories (part 2)
DTSTART;VALUE=DATE-TIME:20100219T103000Z
DTEND;VALUE=DATE-TIME:20100219T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-518@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
518
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=518
END:VEVENT
BEGIN:VEVENT
SUMMARY:Large N reduction on group manifolds and coset spaces
DTSTART;VALUE=DATE-TIME:20100225T090000Z
DTEND;VALUE=DATE-TIME:20100225T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-538@cern.ch
DESCRIPTION:We show that the large N reduction holds on group manifolds. L
arge N field theories defined on group manifolds are equivalent to some co
rresponding matrix models. For instance\, gauge theories on S^3 can be reg
ularized in a gauge invariant and SO(4) invariant manner. In addition\, as
an extension of the large N reduction on group manifolds\, we show that l
arge N field theories on coset spaces are also described by certain corres
ponding matrix models.\n\nhttps://indico.tifr.res.in/indico/conferenceDisp
lay.py?confId=538
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=538
END:VEVENT
BEGIN:VEVENT
SUMMARY:Review of "String scattering in flat space and a scaling limit of
Yang-Mills correlators" by Okuda and Penedones
DTSTART;VALUE=DATE-TIME:20100226T103000Z
DTEND;VALUE=DATE-TIME:20100226T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-536@cern.ch
DESCRIPTION:The authors of this paper have derived a rather concrete relat
ion between flat-space scattering amplitudes for type IIB superstrings in
10d and a specific scaling limit of N=4 supersymmetric Yang-Mills correlat
ors in 4d. The speaker will try (possibly without success) to review this
paper.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=53
6
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=536
END:VEVENT
BEGIN:VEVENT
SUMMARY:Worldvolume superalgebra of Nambu-Poisson M5-brane
DTSTART;VALUE=DATE-TIME:20100401T103000Z
DTEND;VALUE=DATE-TIME:20100401T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-570@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
570
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=570
END:VEVENT
BEGIN:VEVENT
SUMMARY:Small Hairy Black Holes in Global AdS_5 \\times S^5
DTSTART;VALUE=DATE-TIME:20100409T103000Z
DTEND;VALUE=DATE-TIME:20100409T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-589@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
589
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=589
END:VEVENT
BEGIN:VEVENT
SUMMARY:Integrability\, supercosets and AdS/CFT
DTSTART;VALUE=DATE-TIME:20100419T103000Z
DTEND;VALUE=DATE-TIME:20100419T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-604@cern.ch
DESCRIPTION:I will review some recent progress in our understanding of the
AdS/CFT correspondence using integrability methods.\n\nhttps://indico.tif
r.res.in/indico/conferenceDisplay.py?confId=604
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=604
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-supersymmetric AdS Vacua in String Theory and Their Stability
DTSTART;VALUE=DATE-TIME:20100423T103000Z
DTEND;VALUE=DATE-TIME:20100423T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-616@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
616
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=616
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black hole degeneracy {\\it is} an index (but which one?)
DTSTART;VALUE=DATE-TIME:20100426T103000Z
DTEND;VALUE=DATE-TIME:20100426T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-620@cern.ch
DESCRIPTION:1. We argue that for black holes which preserve at least four
supersymmetries\, the Wald entropy always equals the logarithm of a supers
ymmetric index. We verify this in several examples by computing the Wald e
ntropy precisely and comparing with the exact microscopic counting. In all
examples\, when the microscopic degeneracy and index do not agree\, it is
the index that agrees with the macroscopic answer.\n\n2. The general pres
cription for computing this index in the microscopic theory is not known.
In simple situations in string theory\, modular symmetry provides strong c
onstrains on the black hole index. In situations with moduli dependence an
d wall-crossing\, this modular property is destroyed. We show that in N =
4 theories\, the black hole index is a {\\it mock} modular form.\n\nhttps:
//indico.tifr.res.in/indico/conferenceDisplay.py?confId=620
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=620
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the stability of Non-Supersymmetric AdS vacua
DTSTART;VALUE=DATE-TIME:20100430T090000Z
DTEND;VALUE=DATE-TIME:20100430T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-623@cern.ch
DESCRIPTION:In this talk\, I discuss the two infinite families of Non-Supe
rsymmetric AdS4 vacua\, called Type 2) and Type 3) vacua\, that arise in m
assive IIA supergravity with flux. Both families are perturbatively stabl
e. I also discuss non-perturbative decays of these vacua to other susy and
non-susy AdS4 vacua mediated by instantons in the thin wall approximatio
n. Many decays are ruled out because of the protection offered by AdS geo
metry. In fact\, within our approximations\, no decays of Type 2) vacua a
re allowed\, although some decays are only marginally forbidden. This can
be understood in terms of a "pairing symmetry" in the landscape which rel
ate Type 2) vacua with supersymmetric ones of the same energy.\n\nhttps://
indico.tifr.res.in/indico/conferenceDisplay.py?confId=623
LOCATION:Colaba Campus AG-69
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=623
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermodynamic bubble ansatz
DTSTART;VALUE=DATE-TIME:20100514T103000Z
DTEND;VALUE=DATE-TIME:20100514T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-635@cern.ch
DESCRIPTION:For computations of scattering amplitudes of gluons at strong
coupling\, one considers minimal area surfaces in AdS_5 which end on a nul
l polygonal contour at the boundary. A new method was developed by Alday\,
Gaiotto and Maldacena in which one doesn't need to solve for exact embedd
ing of worldsheet but instead one maps the problem to a Hitchin system. On
e then writes an integral equation which determines the area as a function
of the shape of the polygon. The equations are identical to those of the
Thermodynamic Bethe ansatz. The area is given by the free energy of this T
BA system. The working of this method will be shown for the case of hexago
n closely following the work of above authors in hep-th/0911.4708.\n\nhttp
s://indico.tifr.res.in/indico/conferenceDisplay.py?confId=635
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=635
END:VEVENT
BEGIN:VEVENT
SUMMARY:Review on the virtue of defects in 4D gauge theories and 2D CFTs-I
I
DTSTART;VALUE=DATE-TIME:20100602T103000Z
DTEND;VALUE=DATE-TIME:20100602T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-652@cern.ch
DESCRIPTION:In earlier talk\, We set up the M-theory background and introd
uced the relation between 4d gauge theories and 2d CFTs. In this talk\, I'
ll discuss the relation between non-local operators in 4d gauge theory and
ones in 2d CFTs. The 4d interpretations of topological defects and monodr
omy of degenerate fields in the 2d side will provide the way to calculate
the VEVs of Wilson-'t Hooft operators in the 4d side. Moore-Seiberg groupo
id describes monodromy of local operators in 2d CFTs.\n\nhttps://indico.ti
fr.res.in/indico/conferenceDisplay.py?confId=652
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=652
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higher derivative corrections in type IIB string theory
DTSTART;VALUE=DATE-TIME:20100603T023000Z
DTEND;VALUE=DATE-TIME:20100603T033000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-660@cern.ch
DESCRIPTION:I shall talk about a class of protected interactions in the lo
w energy effective action of type IIB string theory in 10 dimensions. Thes
e interactions are completely fixed by supersymmetry and duality.\n\nhttps
://indico.tifr.res.in/indico/conferenceDisplay.py?confId=660
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=660
END:VEVENT
BEGIN:VEVENT
SUMMARY:Review on the virtue of defects in 4D gauge theories and 2D CFTs-I
II
DTSTART;VALUE=DATE-TIME:20100604T103000Z
DTEND;VALUE=DATE-TIME:20100604T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-659@cern.ch
DESCRIPTION:In earlier talk\, We set up the M-theory background and introd
uced the relation between 4d gauge theories and 2d CFTs. In this talk\, I'
ll discuss the relation between non-local operators in 4d gauge theory and
ones in 2d CFTs. The 4d interpretations of topological defects and monodr
omy of degenerate fields in the 2d side will provide the way to calculate
the VEVs of Wilson-'t Hooft operators in the 4d side. Moore-Seiberg groupo
id describes monodromy of local operators in 2d CFTs.\n\nhttps://indico.ti
fr.res.in/indico/conferenceDisplay.py?confId=659
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=659
END:VEVENT
BEGIN:VEVENT
SUMMARY:When UV physics does not decouple from inflation
DTSTART;VALUE=DATE-TIME:20100607T103000Z
DTEND;VALUE=DATE-TIME:20100607T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-655@cern.ch
DESCRIPTION:In this talk\, we discuss several contexts in which heavy phys
ics does not decouple from the light sector that gives rise to inflation a
nd quantify modifications to CMB observables that result. One particular c
ontext is when the field manifold exhibits non-trivial curvature that dyna
mically mixes heavy and light directions as inflation progresses\, as is t
ypical in certain models of stringy inflation. Another context arises when
the adiabatic approximation is violated due to non-trivial dynamics in th
e heavy sector. The goal of the talk is to sketch an overview how these\,
and similar results can allow us a window into the UV complete theory in w
hich the putative inflaton field is embedded.\n\nhttps://indico.tifr.res.i
n/indico/conferenceDisplay.py?confId=655
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=655
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Black Holes\, Wall Crossing\, and Mock Modular Forms
DTSTART;VALUE=DATE-TIME:20100618T103000Z
DTEND;VALUE=DATE-TIME:20100618T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-678@cern.ch
DESCRIPTION:We show that the quantum degeneracies of single-centered black
holes in N = 4 theories are coefficients of a mock modular form. The fail
ure of modularity of such a form is of a very special type and is governed
by a holomorphic modular form called the shadow\, such that the sum of th
e mock modular form and a simple non-holomorphic\, real-analytic function
obtained from the shadow transforms like a modular form and is called its
completion. The shadow can be viewed as a holomorphic anomaly associated w
ith the completion. The spectral-flow invariant partition function of thes
e black holes is a mock Jacobi form.\n\nMock modularity is a consequence o
f the meromorphy of the generalized elliptic genus which is closely relate
d to the wall-crossing phenomenon. The completion makes manifest the modul
ar symmetries expected from holography and provides a starting point for a
Rademacher-type expansion of the degeneracies with implications for the e
xact quantum entropy and the Poincare series. Mock modular forms are thus
expected to provide a proper framework for AdS2/CFT1 and AdS3/CFT2 hologra
phy in the context of the MSW string for N = 2 black holes\, and more gene
rally have applications in other physical problems involving noncompact co
nformal field theories and meromorphic Jacobi forms.\n\nhttps://indico.tif
r.res.in/indico/conferenceDisplay.py?confId=678
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=678
END:VEVENT
BEGIN:VEVENT
SUMMARY:Viscosity of Strongly Interacting Fermi Gases
DTSTART;VALUE=DATE-TIME:20100628T103000Z
DTEND;VALUE=DATE-TIME:20100628T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-685@cern.ch
DESCRIPTION:Transport in strongly interacting systems\, which may not supp
ort well-defined quasiparticle excitations\, is a subject of great interes
t in diverse fields ranging from condensed matter\, atomic-molecular and n
uclear physics to string theory. I will begin with a brief review of the u
nitary Fermi gas which lies at the center of the BCS-to-BEC crossover. The
measured shear viscosity to entropy density ratio in the unitary\nFermi g
as comes close to saturating a conjectured lower bound.\n\nI will then des
cribe recent work [1] on the bulk and shear viscosity of non-relativistic
quantum fluids\, with a particular focus on strongly interacting ultracold
Fermi gases. I will discuss exact non-perturbative results based on spect
ral functions and sum rules\, and conclude with a proposal for a spectrosc
opic measurement of the shear viscosity spectral function in the unitary F
ermi gas.\n\n[1] E. Taylor and M. Randeria\, arXiv:1002:0869.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=685
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=685
END:VEVENT
BEGIN:VEVENT
SUMMARY:Proof that Unitarity implies Fuzzballs
DTSTART;VALUE=DATE-TIME:20100630T103000Z
DTEND;VALUE=DATE-TIME:20100630T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-689@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
689
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=689
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermodynamics of Large N Gauge Theories with Chemical Potentials
in a 1/D Expansion
DTSTART;VALUE=DATE-TIME:20100712T103000Z
DTEND;VALUE=DATE-TIME:20100712T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-673@cern.ch
DESCRIPTION:Thermodynamics of large N SYM theories with chemical potential
s associated with R-symmetry charges must be interesting\, since they will
be duals of rotating/charged black holes\, which have rich phase structur
es\, e.g. black hole/black ring transitions and/or black hole/hairy black
hole transitions. However these gauge theories usually involve perturbativ
ely massless adjoint scalars and it is difficult to consider the chemical
potentials\, since they cause perturbative instabilities. In order to inve
stigate this problem\, we study a one dimensional large N gauge theory (bo
sonic BFSS type model) as a first step. (This model is obtained through a
dimensional reduction of a 1+D dimensional SU(N) Yang-Mills theory.) I wil
l demonstrate that we can overcome the chemical potential problem by using
a 1/D expansion and show the phase structure of this model. I will also m
ention the application to higher dimensional gauge theories.\n\nhttps://in
dico.tifr.res.in/indico/conferenceDisplay.py?confId=673
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=673
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lifshitz spacetimes from AdS null and cosmological solutions
DTSTART;VALUE=DATE-TIME:20100714T103000Z
DTEND;VALUE=DATE-TIME:20100714T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-708@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
708
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=708
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nekrasov partition function and Pestun's Localization formula I
DTSTART;VALUE=DATE-TIME:20100716T103000Z
DTEND;VALUE=DATE-TIME:20100716T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-703@cern.ch
DESCRIPTION:Nekrasov used a $U(1)^2$ subgroup of the SO(4) Lorentz symmetr
y on $R^4$ to define a $U(1)^2$-equivariant version of the topological par
tition function\, or\, equivalently\, the partition function of the $N= 2$
supersymmetric gauge theory in the Omega-deformed background. The integra
l over the moduli space of instantons localizes at the fixed point set of
a group which acts on the moduli space by Lorentz rotations of the spaceti
me and gauge transformations at infinity. Pestun gave a new matrix integra
l which\, with all instanton corrections included\, is well defined in the
$N = 2$\, the $N = 2*$ and the $N = 4$ cases\, and gives the exact partit
ion function of these theories on S4. The expectation value of a supersymm
etric circular Wilson operator on S4 in an arbitrary representation is equ
al to the expectation value of the operator $Tr_R[exp(2\\pi ira)]$ in this
matrix model. In the first talk\, I will explain the Nekrasov partition f
unction and will talk about Pestun's localization method in the second tal
k.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=703
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=703
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nekrasov partition function and Pestun's Localization formula II
DTSTART;VALUE=DATE-TIME:20100719T103000Z
DTEND;VALUE=DATE-TIME:20100719T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-704@cern.ch
DESCRIPTION:Nekrasov used a $U(1)^2$ subgroup of the SO(4) Lorentz symmetr
y on $R^4$ to define a $U(1)^2$-equivariant version of the topological par
tition function\, or\, equivalently\, the partition function of the $N= 2$
supersymmetric gauge theory in the Omega-deformed background. The integra
l over the moduli space of instantons localizes at the fixed point set of
a group which acts on the moduli space by Lorentz rotations of the spaceti
me and gauge transformations at infinity. Pestun gave a new matrix integra
l which\, with all instanton corrections included\, is well defined in the
$N = 2$\, the $N = 2*$ and the $N = 4$ cases\, and gives the exact partit
ion function of these theories on S4. The expectation value of a supersymm
etric circular Wilson operator on S4 in an arbitrary representation is equ
al to the expectation value of the operator $Tr_R[exp(2\\pi ira)]$ in this
matrix model. In the first talk\, I will explain the Nekrasov partition f
unction and will talk about Pestun's localization method in the second tal
k.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=704
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=704
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards Quantum Quench in ADS/CFT
DTSTART;VALUE=DATE-TIME:20100802T103000Z
DTEND;VALUE=DATE-TIME:20100802T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-722@cern.ch
DESCRIPTION:We study time dependent couplings in conformal field theories
using rotating probe branes in AdS X S spacetimes. We find that induced me
trics on the brane worldvolumes develop horizons with characteristic Hawki
ng temperatures even when there is no black hole in the bulk. This framewo
rk is used to obtain toy models for quantum quench.\n\nhttps://indico.tifr
.res.in/indico/conferenceDisplay.py?confId=722
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=722
END:VEVENT
BEGIN:VEVENT
SUMMARY:A discussion on Erik Verlinde's Proposal that gravity is an entrop
ic force (arXiv 1001.0785).
DTSTART;VALUE=DATE-TIME:20100805T103000Z
DTEND;VALUE=DATE-TIME:20100805T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-740@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
740
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=740
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic RG flows
DTSTART;VALUE=DATE-TIME:20101015T090000Z
DTEND;VALUE=DATE-TIME:20101015T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-867@cern.ch
DESCRIPTION:I will discuss some recent papers on the above subject\, espec
ially Heemskerk and Polchinski (1010.1264) which discusses RG by integrati
ng over slices of AdS space. I will also discuss the Semi-holographic mode
ls by Faulkner and Polchinski (1001.5049) and Nickel and Son (1009.3094) w
hich discuss RG flows from AdS(4) to AdS(2) using phenomenological models.
\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=867
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=867
END:VEVENT
BEGIN:VEVENT
SUMMARY:Glueball Spectra from Gauge-Gravity Duality
DTSTART;VALUE=DATE-TIME:20101129T103000Z
DTEND;VALUE=DATE-TIME:20101129T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-990@cern.ch
DESCRIPTION:In this talk\, we present a very general formalism for the hol
ographic computation of glueball spectra that is applicable to a large num
ber of systems\, either obtainable from string theory\, or within the cont
ext of bottom-up effective field theory constructions. Using this formalis
m\, we study a few examples (both from string theory as well as simpler to
y models) chosen so as to be of relevance to theories with so-called walki
ng behaviour\, i.e. theories for which the gauge coupling stays approximat
ely constant over a large intermediate energy regime. In particular\, we a
ddress the question of whether the spectra of such theories contain a para
metrically light scalar\, present due to the spontaneous breaking of appro
ximate scale invariance.\n\nhttps://indico.tifr.res.in/indico/conferenceDi
splay.py?confId=990
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=990
END:VEVENT
BEGIN:VEVENT
SUMMARY:Infra red effects in de Sitter space
DTSTART;VALUE=DATE-TIME:20101203T103000Z
DTEND;VALUE=DATE-TIME:20101203T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1006@cern.ch
DESCRIPTION:I will discuss infra red effects in de Sitter space\, in parti
cular the much-discussed and confusing issues of divergences in interactin
g massive theories in a background de Sitter space.\n\nI will aim to reach
and cover the two recent papers:\n\n1) The IR stability of de Sitter QFT:
results at all orders. Donald Marolf\, Ian A. Morrison\, . Oct 2010. Temp
orary entry e-Print: rXiv:1010.5327 [gr-qc]\nand\n2) Correlators\, Feynma
n diagrams\, and quantum no-hair in deSitter spacetime.\nStefan Hollands\,
. Oct 2010. 45pp. Temporary entry e-Print: arXiv:1010.5367 [gr-qc]\n\nAs
an (extended) background\, I will try to review the following papers:\n\n-
- A. M. Polyakov 0709.2899 [hep-th]\, 0912.5503 [hep-th]\;\n-- S. Weinberg
\, hep-th/0506236 and hep-th/0605244\;\n-- (If time permits)\nStarobinsky
and Yokoyama astro-ph/9407016\,\nRiotto and Sloth 0801.1845 [hep-ph]\;\nB
urgess\, Holman\, Leblond\, Shandera\, 0912.1608 [hep-th]\n\nA review of s
ome of these issues may be found in\nAntoniadis\, Mazur\, Mottola gr-qc/06
12068\n\nand interesting further reading is:\nBurgess\, Holman\, Leblond\,
Shandera\, 1005.3551 [hep-th]\nand Rajaraman\, 1008.1271 [hep-th].\n\nA s
lightly orthogonal\, but nice review is in:\nSpradlin\, Strominger\, Volov
ich\, hep-th/0110007\n\nhttps://indico.tifr.res.in/indico/conferenceDispla
y.py?confId=1006
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1006
END:VEVENT
BEGIN:VEVENT
SUMMARY:IR effects in de Sitter space 2 -- massless fields
DTSTART;VALUE=DATE-TIME:20101209T103000Z
DTEND;VALUE=DATE-TIME:20101209T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1026@cern.ch
DESCRIPTION:After recapitulating the discussion of last week on how to def
ine sensible correlation functions for massive fields on de Sitter space\,
I will move on to the more interesting case of massless fields.\n\nI will
begin by discussing how there are no dS invariant vacua for free massless
fields\, and then discuss the breakdown of perturbation theory for intera
cting theories in the Bunch- avies vacuum (Burgess\, Holman\, Leblond\, Sh
andera\, 1005.3551 [hep-th]). I will briefly discuss the resummation of l
eading logs using a Boltzmann type equation (Starobinsky and Yokoyama astr
o-ph/9407016\, Riotto and Sloth 0801.1845 [hep-ph])\, and finally discuss
some recent work (Rajaraman\, arXiv:1008.1271 [hep-th]) on how to recover
the resumed answer using a correct path integral treatment of massless int
eracting fields.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py
?confId=1026
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1026
END:VEVENT
BEGIN:VEVENT
SUMMARY:Unravelling the novel Higgs mechanism
DTSTART;VALUE=DATE-TIME:20101227T103000Z
DTEND;VALUE=DATE-TIME:20101227T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1029@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
1029
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1029
END:VEVENT
BEGIN:VEVENT
SUMMARY:Comments on Vasiliev Theory
DTSTART;VALUE=DATE-TIME:20110112T103000Z
DTEND;VALUE=DATE-TIME:20110112T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1091@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
1091
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1091
END:VEVENT
BEGIN:VEVENT
SUMMARY:Supersymmetry\, Localization and Quantum Entropy Function
DTSTART;VALUE=DATE-TIME:20110113T103000Z
DTEND;VALUE=DATE-TIME:20110113T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1082@cern.ch
DESCRIPTION:AdS_2/CFT_1 correspondence leads to a prescription for computi
ng the degeneracy of black hole states in terms of path integral over stri
ng fields living on the near horizon geometry of the black hole. In this t
alk\, I will discuss about how to make use of the enhanced supersymmetries
of the near horizon geometry and localization techniques to argue that th
e path integral receives contribution only from a special class of string
field configurations which are invariant under a subgroup of the supersymm
etry transformations. I will identify saddle points which are invariant un
der this subgroup. I will also use this analysis to show that the integrat
ion over infinite number of zero modes generated by the asymptotic symmetr
ies of AdS_2 generate a finite contribution to the path integral.\n\nhttps
://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1082
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1082
END:VEVENT
BEGIN:VEVENT
SUMMARY:String Field Theory - Liberating Right and Left Movers
DTSTART;VALUE=DATE-TIME:20110117T103000Z
DTEND;VALUE=DATE-TIME:20110117T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1089@cern.ch
DESCRIPTION:We put forward a new proposal of a string field theory. Our pr
oposal deviates from other formulations\, such as those of Kakku and ikkaw
a and Witten\, in that we do NOT distinguish certain string configurations
which are considered as distinct in the other formulations. The states of
the ``Fock space'' representing the several strings are described by the
images on the target space-time light cone. One of the tricks is to treat
in a "lattice regularized" version of $\\tau_R = \\tau - \\sigma$ the eve
n numbered and odd numbered points differently. If our proposal is right\,
string theory is essentially a solved (solvable) model.\n\nhttps://indico
.tifr.res.in/indico/conferenceDisplay.py?confId=1089
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1089
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chronology protection and the stringy exclusion principle
DTSTART;VALUE=DATE-TIME:20110120T103000Z
DTEND;VALUE=DATE-TIME:20110120T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1102@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
1102
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1102
END:VEVENT
BEGIN:VEVENT
SUMMARY:Turning on interactions in the D1D5 CFT
DTSTART;VALUE=DATE-TIME:20110131T103000Z
DTEND;VALUE=DATE-TIME:20110131T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1122@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
1122
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1122
END:VEVENT
BEGIN:VEVENT
SUMMARY:Blackfolds
DTSTART;VALUE=DATE-TIME:20110203T103000Z
DTEND;VALUE=DATE-TIME:20110203T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1128@cern.ch
DESCRIPTION:The blackfold approach is a recently developed method for cons
tructing approximate analytic black hole solutions in any space-time dimen
sion and background. The main idea consists in wrapping flat black membran
es around specific submanifolds\, which turns out to have a simple fluid i
nterpretation. The theoretical foundations of this method will be explaine
d and\, through examples\, shown how to use it to scan the space of allowe
d black hole solutions in flat space as well as in (A)dS backgrounds. Char
ged generalizations as well as thermal generalizations of string theory so
lutions will be discussed.\n\nBased on the papers: arXiv:0910.1601\; arXiv
:0912.2352\; arXiv: 1012.5081\; arXiv: 1012.1494\; arXiv:1012.4517\n\nhttp
s://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1128
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1128
END:VEVENT
BEGIN:VEVENT
SUMMARY:M2 and M5 branes
DTSTART;VALUE=DATE-TIME:20110214T103000Z
DTEND;VALUE=DATE-TIME:20110214T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1177@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
1177
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1177
END:VEVENT
BEGIN:VEVENT
SUMMARY:Planck Mission: Goals\, Early Results and Analysis Challenges
DTSTART;VALUE=DATE-TIME:20110217T103000Z
DTEND;VALUE=DATE-TIME:20110217T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1181@cern.ch
DESCRIPTION:Precise measurement of the Cosmic Microwave Background (CMB) a
nisotropies can accurately constrain many cosmological models and paramete
rs. Over the last decade measurements of CMB anisotropy has spearheaded th
e remarkable transition of cosmology into a precision science. Nevertheles
s\, much more information about the universe remains to be extracted from
CMB anisotropy\, specially from polarization. The current and future CMB m
issions are aimed to probe the early universe\, in particular cosmological
inflation\, at unprecedented accuracy. However\, extracting maximum amoun
t of science from these high-resolution-low-noise data-rich experiments al
so pose a stiff challenge to current analysis techniques. The analysis tec
hniques must not only be computationally fast to contend with the huge siz
e of the datasets\, but the higher sensitivity also limits the simplifying
assumptions which could then be invoked to achieve the desired speed with
out compromising the final precision goals. The effect of asymmetric beams
is perhaps the most important and challenging systematic effect in the cu
rrent and future CMB missions. We have developed and implemented a very fa
st pixel based method to account for this systematic effect in Planck anal
yses. This presentation will broadly describe the Planck mission\, its goa
ls\, analysis challenges and the early astrophysical results announced on\
nJanuary 11\, 2011\, with special emphasis on the systematic effect of asy
mmetric beams.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?c
onfId=1181
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1181
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coupling fermions to quantum gravity via spectral triples
DTSTART;VALUE=DATE-TIME:20110221T103000Z
DTEND;VALUE=DATE-TIME:20110221T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1190@cern.ch
DESCRIPTION:In my talk I will first review the construction of a semi-fini
te spectral triple over a configuration space of connections. This spectra
l triple involves a noncommutative algebra of holonomy loops and a Dirac t
ype operator\, which resembles a functional derivation operator. The inter
action between the algebra and the Dirac type operator reproduces the Pois
son structure of general relativity when formulated in terms of Ashtekar v
ariables. This means that the spectral triple captures the kinematics of q
uantum gravity. I will show that within this spectral triple construction
natural\, semi-classical states exist on which the expectation value of th
e Dirac type operator gives the Dirac Hamiltonian in 3+1 dimensions in a s
emi-classical limit. These states have\, thus\, a natural interpretation a
s one-particle states. Finally\, I will show how also many-particle states
might also emerge from the construction.\n\nhttps://indico.tifr.res.in/in
dico/conferenceDisplay.py?confId=1190
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1190
END:VEVENT
BEGIN:VEVENT
SUMMARY:Probing a Stochastic Gravitational Wave Background using a Network
of Laser Interferometric Detectors
DTSTART;VALUE=DATE-TIME:20110222T090000Z
DTEND;VALUE=DATE-TIME:20110222T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1186@cern.ch
DESCRIPTION:Gravitational Wave (GW) detectors are coming close to the long
awaited direct detection of sources. LIGO and Virgo detectors are operati
ng at either better or close to their first generation goal sensitivity. M
ore ground based and space based detectors are expected in a decade. An ex
citing new window of astronomy is about to be opened.\n\nGW astronomy aims
to probe different kinds of sources\, Stochastic Gravitational Wave Backg
round (SGWB) is one of the most interesting ones. The universe is expected
to have an SGWB generated by unmodeled/unresolved astrophysical and cosmo
logical sources. Statistically isotropic cosmological SGWB has already cau
ght lot of attention\, as it is a direct probe of slow roll nflation. On t
he other hand\, anisotropic SGWB\, generated by unmodeled/unresolved astro
physical sources in the nearby universe\, dominates the background by seve
ral orders of magnitude and can provide important information about the ne
arby universe not accessible to electro-magnetic astronomy. A gravitationa
l wave radiometer algorithm is well suited for probing SGWB. We present a
general analysis framework to efficiently probe SGWB in any given basis us
ing a network of detectors. We study the performance of a network using di
fferent figures of merit. Simplicity of this method leads to results which
are relatively straightforward to compute\, yet provide vital understandi
ng of the overall network performance.\n\nhttps://indico.tifr.res.in/indic
o/conferenceDisplay.py?confId=1186
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1186
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finding higher-dimensional supergravity solutions
DTSTART;VALUE=DATE-TIME:20110307T103000Z
DTEND;VALUE=DATE-TIME:20110307T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1218@cern.ch
DESCRIPTION:We review various techniques for finding solutions in ten and
eleven-dimensional supergravity. In particular\, we focus on G-structures\
, consistent truncations and Non-Abelian T-duality\, the latter of which i
s only now being understood in a supergravity setting.\n\nhttps://indico.t
ifr.res.in/indico/conferenceDisplay.py?confId=1218
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1218
END:VEVENT
BEGIN:VEVENT
SUMMARY:On The Geometry of Heterotic String Compactifications
DTSTART;VALUE=DATE-TIME:20110317T103000Z
DTEND;VALUE=DATE-TIME:20110317T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1237@cern.ch
DESCRIPTION:I will discuss the properties of heterotic string compactifica
tions on manifolds which are complex and have vanishing first Chern class\
, but which are not Kahler. I will describe how these are connected to the
more traditional compactifications on Calabi-Yau manifolds through flops
and conifold transitions. Time permitting\, I will discuss some of open p
roblems\, in particular the understanding of the moduli space of these com
pactifications and the massless spectrum of the effective 4 dimensional su
persymmetric field theory.\n\nhttps://indico.tifr.res.in/indico/conference
Display.py?confId=1237
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1237
END:VEVENT
BEGIN:VEVENT
SUMMARY:Localization of N=4 SCFT on S^1 x S^3 and Index
DTSTART;VALUE=DATE-TIME:20110411T103000Z
DTEND;VALUE=DATE-TIME:20110411T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1300@cern.ch
DESCRIPTION:We provide the geometric meaning of the N=4 superconformal ind
ex. With this consideration\, the N=4 index can be interpreted as the part
ition function on a Scherk-Schwarz deformed background. By standard locali
zation methods\, we add a $Q$-exact term to the Scherk-Schwarz deformed ac
tion. The critical points of the $Q$-exact term turn out to be the space o
f flat connections which are\, in fact\, zero modes of the gauge field. Th
en one-loop evaluation reduces the matrix integral Minwalla et al obtained
in 2005. In addition\, if time permits\, I will describe the prospect on
the relation between the N=1 index and $a$-maximization which would be an
analogue in four dimensions of the $Z$-extremization Jafferis has recently
argued in three dimensions.\n\nhttps://indico.tifr.res.in/indico/conferen
ceDisplay.py?confId=1300
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1300
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exact holography for small black holes
DTSTART;VALUE=DATE-TIME:20110418T103000Z
DTEND;VALUE=DATE-TIME:20110418T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1325@cern.ch
DESCRIPTION:Following recent advances on the computation of the Sen's quan
tum entropy function I will use supersymmetric localization in AdS2xS^2 su
pergravity to compute exactly the degeneracy of small black holes in N=4 s
tring theory. In this framework I will show that the answer has an OSV typ
e formula with minor but important corrections due to one-loop determinant
s and additional orbifold saddle points. This can then be compared with an
exact microscopic answer given by the Rademacher expansion of the inverse
of the Ramanujan function\, the index that counts 1/2 BPS states in N=4 s
tring theory. Impressive agreement is found at all orders in the expansion
provinding us with a deep insight into the quantum structure of gravity a
nd a non-trivial test of holography.\n\nhttps://indico.tifr.res.in/indico/
conferenceDisplay.py?confId=1325
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1325
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strongly coupled dense matter and hedgehog black holes
DTSTART;VALUE=DATE-TIME:20110425T103000Z
DTEND;VALUE=DATE-TIME:20110425T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1334@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
1334
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1334
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dressed magnons in symmetric spaces and dressed Wilson loops on S^
2
DTSTART;VALUE=DATE-TIME:20110502T103000Z
DTEND;VALUE=DATE-TIME:20110502T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1339@cern.ch
DESCRIPTION:The dressing method uses the integrability of a system and all
ows the construction of new classical string solutions from old ones. I w
ill explain how the dressing method works and I will then apply it in the
context of the AdS/CFT correspondence to two interesting and different pro
blems\, giant magnons and Wilson loops. The talk will be based on my rece
nt work.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
1339
LOCATION:Colaba Campus A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1339
END:VEVENT
BEGIN:VEVENT
SUMMARY:On relation between 4d superconformal indices and lower-dimensiona
l partition functions
DTSTART;VALUE=DATE-TIME:20110530T103000Z
DTEND;VALUE=DATE-TIME:20110530T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1412@cern.ch
DESCRIPTION:After the work of Kapustin et al\, many 3d partition functions
has been\ncomputed exactly by using localization technique. Recently it w
as\nfound that various 3d partition functions can be obtained by taking\nc
ertain limits of 4d superconformal indices. From this identification\,\non
e can give an explanation of 3d mirror symmetry by Electro-Magnetic\nduali
ty (S-duality) of 4d theory. In addition\, it was shown by\nRastelli et al
that q-deformed 2d Yang-Mills theory which is\ntopological becomes a too
l to compute N=2 4d superconformal\nindices. Dualities such as mirror symm
etry\, S-duality and Gaiotto\nduality can be used to obtain twisted partit
ion functions for theories\nwithout Lagrangian descriptions. This developm
ent is also closely\nrelated to 3d AGT relation.\n\nReference:\nFrom 4d su
perconformal indices to 3d partition functions by\nF. A. H. Dolan\, V. P.
Spiridonov\, G. S. Vartanov\nhttp://arxiv.org/abs/1104.1787\n\nReducing
the 4d Index to the S3 Partition Function by A. Gadde\,\nW. Yan\nhttp://ar
xiv.org/abs/1104.2592\n\nRelation between the 4d superconformal index and
the S3 partition\nfunction by Y. Imamura\nhttp://arxiv.org/abs/1104.4482\n
\n3d Partition Function as Overlap of Wavefunctions by T. Nishioka\,\nY. T
achikawa\, M. Yamazaki\nhttp://arxiv.org/abs/1105.4390\n\nFor 3d AGT rela
tion\n\nAGT on the S-duality Wall\nNotes on SUSY Gauge Theories on Three-S
phere\nSUSY Gauge Theories on Squashed Three-Spheres \nby K. Hosomichi\,
S. Lee\, J. Park\n\nhttp://arxiv.org/abs/1009.0340\nhttp://arxiv.org/abs/
1012.3512\nhttp://arxiv.org/abs/1102.4716\n\nhttps://indico.tifr.res.in/in
dico/conferenceDisplay.py?confId=1412
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1412
END:VEVENT
BEGIN:VEVENT
SUMMARY:Low energy supersymmetry from R-symmetries
DTSTART;VALUE=DATE-TIME:20110707T103000Z
DTEND;VALUE=DATE-TIME:20110707T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1495@cern.ch
DESCRIPTION:We prove that the existence of a supersymmetric vacuum with a\
nvanishing superpotential can be a consequence of an R-symmetry when\nther
e are more fields invariant under the R-symmetry than fields\ntransforming
the same way as the superpotential. The implication to\nflux compactifica
tion is discussed.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.
py?confId=1495
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1495
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chaotic solutions in String Theory
DTSTART;VALUE=DATE-TIME:20110715T103000Z
DTEND;VALUE=DATE-TIME:20110715T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1514@cern.ch
DESCRIPTION:It is known that classical string dynamics in pure AdS5 x S5
is integrable and plays an important role in solvability. We numerically i
nvestigate classical string equations of motion in the AdS soliton backgro
und and find chaotic solutions\, thereby implying non-integrability. We al
so arrive at the same conclusion from an analytical approach to the proble
m.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1514
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1514
END:VEVENT
BEGIN:VEVENT
SUMMARY:S duality\, Superconformal Index and 2d Topological QFT
DTSTART;VALUE=DATE-TIME:20110718T103000Z
DTEND;VALUE=DATE-TIME:20110718T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1515@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
1515
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1515
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-supersymmetric quantum attractors in string theory
DTSTART;VALUE=DATE-TIME:20110725T103000Z
DTEND;VALUE=DATE-TIME:20110725T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1527@cern.ch
DESCRIPTION:In this talk\, we will discuss the attractor mechanism for the
extremal\nblack holes which do not preserve any supersymmetry. We will co
nstruct\nexamples of such black holes in the type IIA string theory\ncompa
ctified on a Calabi-Yau manifold. These black holes are very much\nsimilar
to their supersymmetric counterparts. However there are some\nimportant d
ifferences between them. For example\, the issue of\nstability for the no
n-supersymmetric black holes remains to be\nverified explicitly. We will d
iscuss this issue in some what detail\nand see the effect of quantum corre
ctions on it.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?co
nfId=1527
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1527
END:VEVENT
BEGIN:VEVENT
SUMMARY:4d Index\, 3d partition function and 2d q-Yang Mills
DTSTART;VALUE=DATE-TIME:20110726T103000Z
DTEND;VALUE=DATE-TIME:20110726T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1525@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
1525
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1525
END:VEVENT
BEGIN:VEVENT
SUMMARY:Toward Dark Energy in String Theory
DTSTART;VALUE=DATE-TIME:20110801T103000Z
DTEND;VALUE=DATE-TIME:20110801T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1540@cern.ch
DESCRIPTION:Some possible approaches to the dark energy in string theory a
re\npresented. I will mainly focus on models in which potentials for the\n
dark energy are essentially derived by classical objects. The minimal\ning
redients for the cosmological constant are specified potentially in\nIIA/I
IB. On the other hand\, the time-varying dark energy can be\nrealized by a
n axion with weakly broken shift-symmetry\, even in the\npresence of high-
scale moduli stabilization and SUSY breaking.\n\nhttps://indico.tifr.res.i
n/indico/conferenceDisplay.py?confId=1540
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1540
END:VEVENT
BEGIN:VEVENT
SUMMARY:The CFT dual of the AdS Dirichlet problem
DTSTART;VALUE=DATE-TIME:20110927T103000Z
DTEND;VALUE=DATE-TIME:20110927T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1714@cern.ch
DESCRIPTION:We study the gravitational Dirichlet problem in AdS spacetimes
with a\nview to understanding the boundary CFT interpretation. We define
the\nproblem as bulk Einstein's equations with Dirichlet boundary\nconditi
ons on fixed timelike cut-off hypersurface. Using the\nfluid/gravity corre
spondence\, we argue that one can determine\nnon-linear solutions to this
problem in the long wavelength regime. On\nthe boundary we find a conforma
l fluid with Dirichlet constitutive\nrelations\, viz.\, the fluid propagat
es on a `dynamical' background\nmetric which depends on the local fluid ve
locities and temperature.\nThis boundary fluid can be re-expressed as an e
mergent hypersurface\nfluid which is non-conformal but has the same value
of the shear\nviscosity as the boundary fluid. The hypersurface dynamics a
rises as a\ncollective effect\, wherein effects of the background are tran
smuted\ninto the fluid degrees of freedom. Furthermore\, we demonstrate th
at\nthis collective fluid is forced to be non-relativistic below a\ncritic
al cut-off radius in AdS to avoid acausal sound propagation with\nrespect
to the hypersurface metric. We further go on to show how one\ncan use this
set-up to embed the recent constructions of flat\nspacetime duals to non-
relativistic fluid dynamics into the AdS/CFT\ncorrespondence. (Reference :
Based on arXiv:1106.2577)\n\nhttps://indico.tifr.res.in/indico/conference
Display.py?confId=1714
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1714
END:VEVENT
BEGIN:VEVENT
SUMMARY:Do neutrinos travel faster than light ?
DTSTART;VALUE=DATE-TIME:20110929T103000Z
DTEND;VALUE=DATE-TIME:20110929T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1719@cern.ch
DESCRIPTION:This talk is meant for wide audience of phenomenologist and st
ring\ntheorists.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py
?confId=1719
LOCATION:Colaba Campus AG80
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1719
END:VEVENT
BEGIN:VEVENT
SUMMARY:Studies of an M5-brane through the BLG model
DTSTART;VALUE=DATE-TIME:20111003T103000Z
DTEND;VALUE=DATE-TIME:20111003T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1718@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
1718
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1718
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic Wilsonian flows and emergent fermions in extremal char
ged black holes
DTSTART;VALUE=DATE-TIME:20111010T103000Z
DTEND;VALUE=DATE-TIME:20111010T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1727@cern.ch
DESCRIPTION:Recently\, a holographic description of field theories with a
cutoff\nhas been proposed by Heemskerk and Polchinski\, leading to a\nholo
graphic version of the Wilsonian renormalization group. In this\ntalk\, we
will describe how to generalize these ideas to fermionic\noperators. We w
ill then proceed to apply them to study RG flows in\nextremal charged blac
k hole backgrounds. Such backgrounds have a dual\nfield theory description
\, which for certain values of the parameters\ncan have a Fermi surface. T
he dynamics near the Fermi surface was\ncaptured by Faulkner and Polchinsk
i in an effective semi-holographic\nmodel\, containing a strongly coupled
sector and an additional fermion\ncoupled to it. We will show how this eff
ective model can be derived\nusing the ideas of holographic Wilsonian reno
rmalization group\, and in\nparticular how the additional fermion emerges
in the low energy\neffective action.\n\nhttps://indico.tifr.res.in/indico/
conferenceDisplay.py?confId=1727
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1727
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic Wilsonian flows and emergent fermions in extremal char
ged black holes (Part II)
DTSTART;VALUE=DATE-TIME:20111013T103000Z
DTEND;VALUE=DATE-TIME:20111013T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1731@cern.ch
DESCRIPTION:Recently\, a holographic description of field theories with a
cutoff\nhas been proposed by Heemskerk and Polchinski\, leading to a\nholo
graphic version of the Wilsonian renormalization group. In this\ntalk\, we
will describe how to generalize these ideas to fermionic\noperators. We w
ill then proceed to apply them to study RG flows in\nextremal charged blac
k hole backgrounds. Such backgrounds have a dual\nfield theory description
\, which for certain values of the parameters\ncan have a Fermi surface. T
he dynamics near the Fermi surface was\ncaptured by Faulkner and Polchinsk
i in an effective semi-holographic\nmodel\, containing a strongly coupled
sector and an additional fermion\ncoupled to it. We will show how this eff
ective model can be derived\nusing the ideas of holographic Wilsonian reno
rmalization group\, and in\nparticular how the additional fermion emerges
in the low energy\neffective action.\n\nhttps://indico.tifr.res.in/indico/
conferenceDisplay.py?confId=1731
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1731
END:VEVENT
BEGIN:VEVENT
SUMMARY:Moulting Black Holes (SUSY and non SUSY)
DTSTART;VALUE=DATE-TIME:20111019T060000Z
DTEND;VALUE=DATE-TIME:20111019T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1742@cern.ch
DESCRIPTION:We first find a family of novel supersymmetric phases of the D
1-D5\nCFT\, which in certain ranges of charges have more entropy than all\
nknown ensembles. We also find bulk BPS configurations that exist in\nthe
same range of parameters as these phases\, and have more entropy\nthan a B
MPV black hole\; they can be thought of as coming from a BMPV\nblack hole
shedding a â€œhairâ€ condensate outside of the horizon. The\nentr
opy of the bulk configurations is smaller than that of the CFT\nphases\, w
hich indicates that some of the CFT states are lifted at\nstrong coupling.
Neither the bulk nor the boundary phases are captured\nby the elliptic ge
nus\, which makes the coincidence of the phase\nboundaries particularly re
markable. Our configurations are the first\ninstance of a black hole entro
py enigma with a controlled CFT\ndual. Furthermore\, contrary to common lo
re\, these objects exist in a\nregion of parameter space (between the ``co
smic censorship bound'' and\nthe ``unitarity bound'') where no black holes
were thought to exist.\n\nMotivated by this we expect stable bound states
of non-extremal\nrotating three-charge black holes in five dimensions (Cv
etic-Youm\nblack holes) and super tubes. We study the system in the probe
limit\nand find that generically the susy marginal bound state becomes\nme
tastable and disappears with non-extremality. However near\nextremality ou
r expectation is realized and there are stable bound\nstates. Angular mome
ntum repulsion is mainly responsible for this\neffect. We use this setup i
n the D1-D5 decoupling limit to map a\nthermodynamic instability of the CF
T (from BH phase to new phase) to a\ndynamical instability of BH to the su
pertube-BH bound state.\n\nhttps://indico.tifr.res.in/indico/conferenceDis
play.py?confId=1742
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1742
END:VEVENT
BEGIN:VEVENT
SUMMARY:5D Super-Yang-Mills and M5-branes
DTSTART;VALUE=DATE-TIME:20111103T103000Z
DTEND;VALUE=DATE-TIME:20111103T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1756@cern.ch
DESCRIPTION:The M5-branes are magnetically dual cousins of M2-branes. But
writing\ndown an interacting field theory for multiple M5-branes has remai
ned\nan elusive goal so far. Recent constructions of various membrane\nthe
ories\, such as ABJM and BLG Chern-Simons matter theories\, has led\nto so
me understanding that gauge-fields are the vital building blocks\nin M-the
ory as well. I shall present an unique way to uplift the\ncosmetic structu
re of 5D SYM to a 6-dimensional framework. The new\n6-dimensional theory
acquires scale invariance.\n\nhttps://indico.tifr.res.in/indico/conference
Display.py?confId=1756
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1756
END:VEVENT
BEGIN:VEVENT
SUMMARY:Conical Defects in Higher Spin Theories
DTSTART;VALUE=DATE-TIME:20111118T083000Z
DTEND;VALUE=DATE-TIME:20111118T093000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1782@cern.ch
DESCRIPTION:We study conical defect geometries in the SL(N\,R) x SL(N\,R)
(and SL(N\, C)) Chern-Simons formulation of higher spin gauge theories in
AdS3. We argue that (for N >= 4) there are special values of the deficit a
ngle for which these geometries are actually smooth configurations of the
underlying theory. We also exhibit a gauge in which these geometries can b
e viewed as wormholes interpolating between two distinct asymptotically Ad
S3 spacetimes. Remarkably\, the spectrum of smooth SL(N\, C) solutions\, a
fter an appropriate analytic continuation\, exactly matches that of the so
-called ``light primaries'' in the minimal model WN CFTs at finite N. This
gives a candidate bulk interpretation of the latter states in the hologra
phic duality proposed by Gaberdiel and Gopakumar.\n\nhttps://indico.tifr.r
es.in/indico/conferenceDisplay.py?confId=1782
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1782
END:VEVENT
BEGIN:VEVENT
SUMMARY:Symmetry Breaking in Local Model Building
DTSTART;VALUE=DATE-TIME:20111201T060000Z
DTEND;VALUE=DATE-TIME:20111201T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1818@cern.ch
DESCRIPTION:D-brane constructions of the Standard Model are often carried
out in a\nlocal setting\; the branes are at singularities or wrap local cy
cles.\nIsometries in the local geometry imply global symmetries in the\nmo
del. In this talk\, we will discuss the size and form of the leading\nsymm
etry breaking effects once such models are embedded into a\ncompactificati
on. The setting allows for hierarchical separation in\nthe symmetry breaki
ng parameters.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?c
onfId=1818
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1818
END:VEVENT
BEGIN:VEVENT
SUMMARY:String Theory and the Moonshine Program
DTSTART;VALUE=DATE-TIME:20111222T103000Z
DTEND;VALUE=DATE-TIME:20111222T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1883@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
1883
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1883
END:VEVENT
BEGIN:VEVENT
SUMMARY:Monte Carlo studies of the phase transition of finite-temperature
large-N gauge theory in 0+1 dimension with a large number of adjoints
DTSTART;VALUE=DATE-TIME:20111228T103000Z
DTEND;VALUE=DATE-TIME:20111228T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1884@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
1884
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1884
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards de Sitter solutions in supergravity
DTSTART;VALUE=DATE-TIME:20120102T103000Z
DTEND;VALUE=DATE-TIME:20120102T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1905@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
1905
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1905
END:VEVENT
BEGIN:VEVENT
SUMMARY:Flat Space S-Matrix Elements from AdS Correlators
DTSTART;VALUE=DATE-TIME:20120112T103000Z
DTEND;VALUE=DATE-TIME:20120112T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1932@cern.ch
DESCRIPTION:We show how flat space S-matrix elements can be elegantly extr
acted\nfrom correlation functions in AdS/CFT. In particular\, we show that
the\n(d+1) dimensional flat-space amplitude of gravitons or gluons can be
\nobtained as the coefficient of a particular singularity of the\nd-dimens
ional correlator of the stress-tensor or a conserved current\nFourier tran
sformed to momentum space. After establishing this method\nat tree-level\,
we discuss how it could be used at arbitrary order in\nperturbation theor
y.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1932
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1932
END:VEVENT
BEGIN:VEVENT
SUMMARY:Four Point Functions of the Stress Tensor and Conserved Currents i
n AdS_{4}/CFT_{3}
DTSTART;VALUE=DATE-TIME:20120113T090000Z
DTEND;VALUE=DATE-TIME:20120113T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1933@cern.ch
DESCRIPTION:We compute four point functions of the stress tensor in AdS4/C
FT3. We bypass the tedious evaluation of Witten diagrams by using the anal
ytic properties of the correlators. In this method\, the four point functi
on is obtained as the sum of residues of a rational function at easily ide
ntifiable poles. We verify that these correlators have the correct flat sp
ace limit and the 4 dimensional graviton amplitude appears as the coeffici
ent of a specified singularity in the correlator. Our results suggest that
double trace operators of the stress tensor\, in theories with a pure gra
vity dual\, do not develop anomalous dimensions at leading order in 1/N.\n
\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1933
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1933
END:VEVENT
BEGIN:VEVENT
SUMMARY:Compressible quantum liquids: field theory versus holography
DTSTART;VALUE=DATE-TIME:20120119T053000Z
DTEND;VALUE=DATE-TIME:20120119T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1949@cern.ch
DESCRIPTION:(Joint String Theory and Mathematical Pysics - Random Interact
ions seminar)\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?co
nfId=1949
LOCATION:Colaba Campus AG80
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1949
END:VEVENT
BEGIN:VEVENT
SUMMARY: Moduli and electromagnetic black brane holography
DTSTART;VALUE=DATE-TIME:20120123T060000Z
DTEND;VALUE=DATE-TIME:20120123T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-1950@cern.ch
DESCRIPTION:In this talk we consider asymptotically AdS5 solutions to 5-di
mensional Einstein-Maxwell theory with Chern-Simons term which are dual to
4-dimensional gauge theories\, including N=4 SYM theory\, in the presence
of a constant background magnetic field B and a uniform electric charge d
ensity. We investigate the thermodynamic and hydrodynamic properties of th
ese 4- dimensional gauge theories holographically. We present a careful an
alysis of the near horizon geometry of these black objects in extremal and
non-extremal limit. Next\, we discuss different first order transport coe
fficients of the theory in the context of the AdS/CFT conjecture.\n\nhttps
://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1950
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=1950
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constraints on Fluid Dynamics from Equilibrium Partition Function
DTSTART;VALUE=DATE-TIME:20120220T090000Z
DTEND;VALUE=DATE-TIME:20120220T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2029@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
2029
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2029
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Simple Harmonic Universe
DTSTART;VALUE=DATE-TIME:20120223T090000Z
DTEND;VALUE=DATE-TIME:20120223T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2031@cern.ch
DESCRIPTION:We explore simple but novel bouncing solutions of general rela
tivity\nthat avoid singularities. These solutions require curvature k=+1\,
and\nare supported by a negative cosmological term and matter with -1 \n\
nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2031
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2031
END:VEVENT
BEGIN:VEVENT
SUMMARY:Localization and Quantum Entropy of Black Holes
DTSTART;VALUE=DATE-TIME:20120301T103000Z
DTEND;VALUE=DATE-TIME:20120301T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2059@cern.ch
DESCRIPTION:I will describe some recent results in computing the quantum e
ntropy\nof supersymmetric black holes using holography and localization in
the\nnear horizon AdS2 geometry of the black holes.\n\nhttps://indico.tif
r.res.in/indico/conferenceDisplay.py?confId=2059
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2059
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bianchi Attractors
DTSTART;VALUE=DATE-TIME:20120305T103000Z
DTEND;VALUE=DATE-TIME:20120305T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2063@cern.ch
DESCRIPTION:Extremal black branes are of interest because they correspond
to the\nground states of field theories at finite charge density in\ngauge
/gravity duality. The geometry of such a brane need not be\ntranslationall
y invariant in the spatial directions along which it\nextends. A less rest
rictive requirement is that of homogeneity\, which\nstill allows points al
ong the spatial directions to be related to each\nother by symmetries. In
this talk\, I will describe a large new classes\nof homogeneous but anisot
ropic extremal black brane horizons\, which\ncould naturally arise in gaug
e/gravity dual pairs. In a system of\nEinstein gravity with negative cosmo
logical term coupled to one or two\nmassive Abelian gauge fields\, we find
solutions with an additional\nscaling symmetry\, which could correspond t
o the near-horizon\ngeometries of such extremal black branes. These soluti
ons realize many\nof the Bianchi classes. In one case\, we construct the c
omplete\nextremal solution which asymptotes to AdS space.\n\nhttps://indic
o.tifr.res.in/indico/conferenceDisplay.py?confId=2063
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2063
END:VEVENT
BEGIN:VEVENT
SUMMARY:ISW imprint of Cosmic Superstructures: A Problem for Lambda CDM
DTSTART;VALUE=DATE-TIME:20120322T103000Z
DTEND;VALUE=DATE-TIME:20120322T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2102@cern.ch
DESCRIPTION:Note: The talk is on cosmology and intended for a broad audien
ce.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2102
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2102
END:VEVENT
BEGIN:VEVENT
SUMMARY:Integrability and the AdS3/CFT2 correspondence
DTSTART;VALUE=DATE-TIME:20120326T103000Z
DTEND;VALUE=DATE-TIME:20120326T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2098@cern.ch
DESCRIPTION:I will review recent progress in the use of integrability in t
he AdS3/CFT2 correspondence. In particular I will show how novel alternati
ng spin-chains with d(2\,1 α symmetry enter the stage as well as how the
problem of the so-called massless modes may be addressed.\n\nhttps://indic
o.tifr.res.in/indico/conferenceDisplay.py?confId=2098
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2098
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bose-Einstein condensation of CMB and damping of sound waves in th
e early Universe ("State of the Universe" seminar series)
DTSTART;VALUE=DATE-TIME:20120416T103000Z
DTEND;VALUE=DATE-TIME:20120416T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2139@cern.ch
DESCRIPTION:In the early Universe\, before recombination\, we have tightly
coupled\nbaryon-electron-photon plasma in the early Universe. The photons
are\nobserved today in the microwave frequency range\, the cosmic microwa
ve\nbackground (CMB). Non-relativistic particles (baryons and electrons)\
ncool faster than radiation as the Universe expands. Compton\nscattering\,
however\, maintains photons and electrons at same\ntemperature by transfe
rring energy from photons to electrons/baryons.\nWe also have standing sou
nd waves in the plasma\, excited by initial\nspatial fluctuations in the e
nergy density of matter/radiation. On\nsmall scales\, photons diffuse thro
ugh the plasma\, destroying the sound\nwaves of wavelength corresponding t
o the diffusion length. The energy\nlost in the sound waves heats up the p
hotons. I will discuss the\ntheoretical and observational consequences of
this cooling and heating\nof CMB and how it may provide a window into the
high energy physics of\nthe early Universe.\n\nhttps://indico.tifr.res.in/
indico/conferenceDisplay.py?confId=2139
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2139
END:VEVENT
BEGIN:VEVENT
SUMMARY:Einstein-(Maxwell)-Dilaton theories: holographic applications and
generalised dimensional reduction
DTSTART;VALUE=DATE-TIME:20120514T103000Z
DTEND;VALUE=DATE-TIME:20120514T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2217@cern.ch
DESCRIPTION:Einstein-Maxwell-Dilaton theories have recently attracted a lo
t of\nattention in holography\, in particular in application to Condensed\
nMatter systems. After reviewing these\, I will explain in this talk how\n
they may derive from scale invariant theories using generalised\ndimension
al reduction\, where the number of reduced dimensions is\ntraded against a
real\, analytically continued parameter. This\ntechnique allows to genera
te easily new black hole solutions (or\nrecover know ones) in gravity plus
scalars theories\, explains their\nscaling properties\, as well as facili
tates the computation of\nholographic observables such as the shear viscos
ity and other\ntransport coefficients.\n\nhttps://indico.tifr.res.in/indic
o/conferenceDisplay.py?confId=2217
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2217
END:VEVENT
BEGIN:VEVENT
SUMMARY:An Infalling Observer in AdS/CFT
DTSTART;VALUE=DATE-TIME:20120706T103000Z
DTEND;VALUE=DATE-TIME:20120706T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2332@cern.ch
DESCRIPTION:In this talk\, we will try and describe the experience of an o
bserver\nfalling into a black hole using the AdS/CFT correspondence. We wi
ll do\nthis by expressing correlation functions of bulk fields\, which suc
h an\nobserver would measure\, in terms of correlation functions on the\nb
oundary. This allows us to translate questions about quantum gravity\ninto
more familiar questions about the boundary theory. We comment on\nthe imp
lications of this construction for the fuzzball proposal and\nthe informat
ion paradox.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?con
fId=2332
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2332
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum infra-red effects in de Sitter space (through Skype)
DTSTART;VALUE=DATE-TIME:20120727T110000Z
DTEND;VALUE=DATE-TIME:20120727T120000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2369@cern.ch
DESCRIPTION:Quantum field theory in de Sitter space is necessary to invest
igate\nphysics in the past and present exponentially expanding universes f
rom\na microscopic view point. In particular\, we focus on the quantum\nef
fects at the super-horizon scale. It is because there is a dS\nsymmetry br
eaking mechanism and physical quantities may acquire time\ndependence as q
uantum effects.\n\nGravitational field is an attractive candidate which in
duces such\ninfra-red effects. I talk mainly about our recent works of sof
t\ngraviton effects on the local dynamics of matter fields at the\nsub-hor
izon scale. We show that soft gravitational effects do not\nspoil Lorentz
invariance in scalar\, Dirac and gauge field theories. In\nthe interacting
field theory with quartic\, Yukawa and gauge\ninteractions\, we find that
the effective couplings are time dependent\nand the evolutions are physic
al as their relative scaling exponents\nare gauge invariant.\n\nhttps://in
dico.tifr.res.in/indico/conferenceDisplay.py?confId=2369
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2369
END:VEVENT
BEGIN:VEVENT
SUMMARY:Minimizing gauge-functional for 2-d gravity and string theory
DTSTART;VALUE=DATE-TIME:20120730T103000Z
DTEND;VALUE=DATE-TIME:20120730T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2376@cern.ch
DESCRIPTION:We show the existence of a minimizing procedure for selecting
a unique\nrepresentative on the orbit of any given Riemann surface that\nc
ontributes to the string partition function. As it must\, the\nprocedure r
educes the string path integral to an integration over a\nparticular funda
mental domain. The later is selected by the choice of\nthe minimizing func
tional. This construction somehow demystifies the\nGribov question.\n\nhtt
ps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2376
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2376
END:VEVENT
BEGIN:VEVENT
SUMMARY:Causal holographic information
DTSTART;VALUE=DATE-TIME:20120802T103000Z
DTEND;VALUE=DATE-TIME:20120802T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2381@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
2381
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2381
END:VEVENT
BEGIN:VEVENT
SUMMARY:Large-N Collective Fields and Holography : Sp(N) Models
DTSTART;VALUE=DATE-TIME:20120806T103000Z
DTEND;VALUE=DATE-TIME:20120806T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2382@cern.ch
DESCRIPTION:We derive the collective theory of large-N Sp(N) spin models a
nd\ndisplay its unconventional features. Using the known relationship\nbet
ween O(N) spin models and Vasiliev theory in AdS space\, we argue\nthat th
e unique features of the Sp(N) collective theory suggest an\ninterpretatio
n in terms of a higher spin theory in de Sitter space\, in\na manner remin
iscent of the way the Liouville mode is naturally\ninterpreted as time in
supercritical string theory.\n\nhttps://indico.tifr.res.in/indico/conferen
ceDisplay.py?confId=2382
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2382
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higher Spins from Strings
DTSTART;VALUE=DATE-TIME:20120814T090000Z
DTEND;VALUE=DATE-TIME:20120814T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2399@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
2399
LOCATION:Colaba Campus AG69
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2399
END:VEVENT
BEGIN:VEVENT
SUMMARY:Monte Carlo studies of the rotational symmetry breaking in dimensi
onally reduced matrix models
DTSTART;VALUE=DATE-TIME:20120816T103000Z
DTEND;VALUE=DATE-TIME:20120816T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2402@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
2402
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2402
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holomorphic blocks in 3d
DTSTART;VALUE=DATE-TIME:20120816T060000Z
DTEND;VALUE=DATE-TIME:20120816T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2403@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
2403
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2403
END:VEVENT
BEGIN:VEVENT
SUMMARY:New states of gauge theories on a circle
DTSTART;VALUE=DATE-TIME:20120827T103000Z
DTEND;VALUE=DATE-TIME:20120827T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2421@cern.ch
DESCRIPTION:We study a one-dimensional large-N U(N) gauge theory on a circ
le as a toy model of higher dimensional Yang-Mills theories at finite temp
erature. To investigate the profile of the thermodynamical potential in th
is model\, we evaluate a stochastic time evolution of several states\, and
find that an unstable confinement phase at high temperature does not deca
y to a stable deconfinement phase directly. Before it reaches the deconfin
ement phase\, it develops to several intermediate states. These states are
characterised by the expectation values of the Polyakov loop operators\,
which wind the temporal circle different times. We reveal that these inter
mediate states are the saddle point solutions of the theory\, and similar
solutions exist in a wide class of SU(N) and U(N) gauge theories on S1 inc
luding QCD and pure Yang-Mills theories in various dimensions. We also con
sider a Kaluza-Klein gravity\, which is the gravity dual of the one-dimens
ional gauge theory on a spatial S1\, and show that these solutions may be
related to multi black holes localised on the S1. Then we present a connec
tion between the stochastic time evolution of the gauge theory and the dyn
amical decay process of a black string though the Gregory-Laflamme instabi
lity.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=242
1
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2421
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black Holes to Quivers (Video Conference talk)
DTSTART;VALUE=DATE-TIME:20120830T103000Z
DTEND;VALUE=DATE-TIME:20120830T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2431@cern.ch
DESCRIPTION:This is the first talk in a new joint seminar series between H
RI and\nTIFR. This will be a video conference talk.\n\nhttps://indico.tifr
.res.in/indico/conferenceDisplay.py?confId=2431
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2431
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermodynamics of 3d higher spin black holes
DTSTART;VALUE=DATE-TIME:20120917T103000Z
DTEND;VALUE=DATE-TIME:20120917T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2470@cern.ch
DESCRIPTION:We explore the thermodynamics of black hole-like classical sol
utions\nin SL(3\, R) Chern-Simons theory. We find multiple branches of\nso
lutions: a stable (BTZ-like) branch\, an unstable one and a new\nstable br
anch. We address certain puzzles in the context of these\nsolutions.\n\nht
tps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2470
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2470
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sum rules and three point functions
DTSTART;VALUE=DATE-TIME:20121022T103000Z
DTEND;VALUE=DATE-TIME:20121022T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2537@cern.ch
DESCRIPTION:Sum rules constraining the R-current spectral densities are de
rived\nholographically for the case of D3-branes\, M2-branes and M5-branes
all\nat finite chemical potentials. In each of the cases the sum rule\nre
lates a certain integral of the spectral density over the frequency\nto te
rms which depend both on long distance physics\, hydrodynamics and\nshort
distance physics of the theory. The terms which which depend on\nthe short
distance physics result from the presence of certain chiral\nprimaries in
the OPE of two R-currents which are turned on at finite\nchemical potenti
al. Since these sum rules contain information of the\nOPE they provide an
alternate method to obtain the structure constants\nof the two R-currents
and the chiral primary. As a consistency check\nwe show that the 3 point f
unction derived from the sum rule precisely\nmatches with that obtained us
ing Witten diagrams.\n\nhttps://indico.tifr.res.in/indico/conferenceDispla
y.py?confId=2537
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2537
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dynamics of Fundamental Flavours and Holographic Duals of Large N
Gauge Theories
DTSTART;VALUE=DATE-TIME:20121029T103000Z
DTEND;VALUE=DATE-TIME:20121029T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2548@cern.ch
DESCRIPTION:Using the gauge-gravity duality\, more specifically the AdS/CF
T\ncorrespondence\, we will discuss strongly coupled dynamics of\nfundamen
tal flavours in a large N gauge theory in and beyond the probe\nlimit. We
will primarily focus on the physics of chiral symmetry\nbreaking by introd
ucing flavour degrees of freedom in the so called\nKlebanov-Witten model.
We will discuss how these fundamental flavours\nrespond to external parame
ters such as non-zero temperature or an\nexternal electro-magnetic field a
nd analyze the corresponding\nnon-trivial phase diagrams. We will briefly
comment on the results of\nsimilar studies in other holographic models.Usi
ng the gauge-gravity duality\, \nmore specifically the AdS/CFT corresponde
nce\, we will discuss strongly\ncoupled dynamics of fundamental flavours i
n a large N gauge theory\nin and beyond the probe limit. We will primarily
focus on the physics of\nchiral symmetry breaking by introducing flavour
degrees of freedom in the\nso called Klebanov-Witten model. We will discus
s how these fundamental \nflavours respond to external parameters such as
non-zero temperature or \nan external electro-magnetic field and analyze t
he corresponding \nnon-trivial phase diagrams. We will briefly comment on
the results of \nsimilar studies in other holographic models.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=2548
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2548
END:VEVENT
BEGIN:VEVENT
SUMMARY:Is Alice burning\, fuzzing or merely falling?
DTSTART;VALUE=DATE-TIME:20121214T103000Z
DTEND;VALUE=DATE-TIME:20121214T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2652@cern.ch
DESCRIPTION:I will go over the recent firewall debate. I will argue that\
nunitarity requires every quantum of radiation leaving the black hole\nto
carry information about the initial state. Unitary evaporation is\nthus in
consistent with an information-free horizon at every step of\nthe evaporat
ion process. To address the experience of an infalling\nobserver\, I will
argue for fuzzball complementarity. Unlike black hole\ncomplementarity an
d observer complementarity which postulate\nasymptotic observers experienc
e a hot membrane while infalling ones\npass freely through the horizon\, f
uzzball complementarity postulates\nthat fine-grained operators experience
the details of the fuzzball\nmicrostate and coarse-grained operators expe
rience the black hole. I\nwill along the way also discuss some other ideas
that have come up to\naddress the firewall.\n\nhttps://indico.tifr.res.in
/indico/conferenceDisplay.py?confId=2652
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2652
END:VEVENT
BEGIN:VEVENT
SUMMARY:W_N minimal model and its Gravity dual
DTSTART;VALUE=DATE-TIME:20121224T103000Z
DTEND;VALUE=DATE-TIME:20121224T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2667@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
2667
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2667
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic vortex liquids and superfluid turbulence
DTSTART;VALUE=DATE-TIME:20130103T103000Z
DTEND;VALUE=DATE-TIME:20130103T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2679@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
2679
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2679
END:VEVENT
BEGIN:VEVENT
SUMMARY:Low Temperature Expansion of Supersymmetric (Matrix) Quantum Mecha
nics
DTSTART;VALUE=DATE-TIME:20130104T103000Z
DTEND;VALUE=DATE-TIME:20130104T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2683@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
2683
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2683
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anomaly and Transport via Inflow (Or Hall Effect)
DTSTART;VALUE=DATE-TIME:20130114T103000Z
DTEND;VALUE=DATE-TIME:20130114T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2720@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
2720
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2720
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Quench in Matrix Models: Dynamical Phase Transitions\, Equ
ilibration and Emergence of Generalized Gibbs Ensemble
DTSTART;VALUE=DATE-TIME:20130117T060000Z
DTEND;VALUE=DATE-TIME:20130117T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2722@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
2722
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2722
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum back reaction in string theory
DTSTART;VALUE=DATE-TIME:20130225T103000Z
DTEND;VALUE=DATE-TIME:20130225T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2813@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
2813
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2813
END:VEVENT
BEGIN:VEVENT
SUMMARY:Consistent dS_{3} Quantum Gravity: Probing Through Lens Sp
aces and holographic aspects.
DTSTART;VALUE=DATE-TIME:20130411T103000Z
DTEND;VALUE=DATE-TIME:20130411T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2901@cern.ch
DESCRIPTION:De Sitter quantum gravity is important in order to understand
stability of universe in terms of the Hartle-Hawking wave function and has
recently emerged as a tool to understand dS3/CFT2. Practically this invol
ves studying the partition function and considering contributions from all
possible topologies. Euclideanized (thermal) de Sitter space and its rami
fications are incorporated through Lens space topologies. Castro\, Maloney
et al (arXiv:1103.4620) found the partition function to be divergent for
pure spin-2 fields. We\, without inclusion of additional matter or topolog
ical mass\, by introducing a dimensionless coupling made the theory free o
f divergences. Moreover we extended this work to spin-3 fields also. Throu
gh an analytic continuation of the cosmological length scale (Lal\, Sahoo\
, arXiv:1209:4804)\, its holographic consequences is also studied.\n\nhttp
s://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2901
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2901
END:VEVENT
BEGIN:VEVENT
SUMMARY:Correlators with Giant Gravitons
DTSTART;VALUE=DATE-TIME:20130429T103000Z
DTEND;VALUE=DATE-TIME:20130429T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-2947@cern.ch
DESCRIPTION:I will describe 1/2 BPS operators in N=4 SYM with unitary\, or
thogonal\nand symplectic gauge groups and their finite N correlation\nfunc
tions. Holographically\, they are dual to giant gravitons. I will\nthen di
scuss the match between the semiclassical three point functions\nin gauge
and string theory.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.
py?confId=2947
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=2947
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic Adventures in 3d Flat Space
DTSTART;VALUE=DATE-TIME:20130613T103000Z
DTEND;VALUE=DATE-TIME:20130613T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3029@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
3029
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3029
END:VEVENT
BEGIN:VEVENT
SUMMARY:Are quantum field theories characterized by their entanglement ent
ropies?
DTSTART;VALUE=DATE-TIME:20130617T103000Z
DTEND;VALUE=DATE-TIME:20130617T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3035@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
3035
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3035
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic Constraints On A Vector Boson
DTSTART;VALUE=DATE-TIME:20130619T090000Z
DTEND;VALUE=DATE-TIME:20130619T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3038@cern.ch
DESCRIPTION:We show that holography poses non-trivial restrictions on vari
ous\ncouplings of an interacting field. For a vector boson in the AdS\nRei
ssner- Nordstrom background\, the dual boundary theory is\npathological un
less its electromagnetic and gravitational multipole\nmoments are constrai
ned. Among others\, a generic dipole moment\nafflicts the dual CFT with su
perluminal modes\, whose remedy bounds the\ngyromagnetic ratio in a range
around the natural value g=2. We discuss\nthe CFT implications of our resu
lts\, and argue that similar\nconsiderations can shed light on how massive
higher-spin fields couple\nto electromagnetism and gravity.\n\nhttps://in
dico.tifr.res.in/indico/conferenceDisplay.py?confId=3038
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3038
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chern Simons Theories with fundamental matter and their bulk duals
DTSTART;VALUE=DATE-TIME:20130620T103000Z
DTEND;VALUE=DATE-TIME:20130620T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3039@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
3039
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3039
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase structure of the Chern-Simons matter theory on S^{2} times S^{1}
DTSTART;VALUE=DATE-TIME:20131003T103000Z
DTEND;VALUE=DATE-TIME:20131003T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3241@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
3241
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3241
END:VEVENT
BEGIN:VEVENT
SUMMARY:Aspects of D3/D7 mu-split supersymmetry
DTSTART;VALUE=DATE-TIME:20131128T060000Z
DTEND;VALUE=DATE-TIME:20131128T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3319@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
3319
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3319
END:VEVENT
BEGIN:VEVENT
SUMMARY: Off-shell string theory
DTSTART;VALUE=DATE-TIME:20131218T060000Z
DTEND;VALUE=DATE-TIME:20131218T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3353@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
3353
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3353
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmic Axion Spin Precession Experiment
DTSTART;VALUE=DATE-TIME:20140211T103000Z
DTEND;VALUE=DATE-TIME:20140211T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3470@cern.ch
DESCRIPTION:We propose an experiment to search for QCD axion and axion-lik
e-particle (ALP) dark matter. Nuclei that are interacting with the backgro
und axion dark matter acquire time-varying CP-odd nuclear moments such as
an electric dipole moment. In analogy with nuclear magnetic resonance\, th
ese moments cause precession of nuclear spins in a material sample in the
presence of a background electric field. This precession can be detected t
hrough high-precision magnetometry. With current techniques\, this experim
ent has sensitivity to axion masses ma < ∼ 10-9 eV\, corresponding to th
eoretically well-motivated axion decay constants fa > ∼ 1016 GeV. With i
mproved magnetometry\, this experiment could ultimately cover the entire r
ange of masses ma < ∼ 10-6 eV\, just beyond the region accessible to cur
rent axion searches.\n\nhttps://indico.tifr.res.in/indico/conferenceDispla
y.py?confId=3470
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3470
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic stress tensor in higher derivative gravity
DTSTART;VALUE=DATE-TIME:20140319T060000Z
DTEND;VALUE=DATE-TIME:20140319T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3539@cern.ch
DESCRIPTION:I will discuss how to compute the holographic stress tensor in
an arbitrary higher derivative theory of gravity using the first law of e
ntanglement. I will show that in the AdS/CFT dictionary the relation betwe
en the stress tensor and the relevant component of the Fefferman Graham me
tric is given through a B type trace anomaly. In even dimensions this in t
urn is related to the coefficient cT appearing in the two point function o
f stress tensors.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.p
y?confId=3539
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3539
END:VEVENT
BEGIN:VEVENT
SUMMARY:More on Theoretical Implications of BICEP-2
DTSTART;VALUE=DATE-TIME:20140331T103000Z
DTEND;VALUE=DATE-TIME:20140331T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3574@cern.ch
DESCRIPTION:We will discuss some of the theoretical implications of BICEP-
2 in\nmore detail\, focussing on the inflationary scenario. The scale of\n
inflation and some constraints on models will be derived and discussed\nmo
re carefully.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?co
nfId=3574
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3574
END:VEVENT
BEGIN:VEVENT
SUMMARY:From Higher Spins to Strings
DTSTART;VALUE=DATE-TIME:20140617T103000Z
DTEND;VALUE=DATE-TIME:20140617T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3736@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
3736
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3736
END:VEVENT
BEGIN:VEVENT
SUMMARY:Some computations using Off-shell (super)string theory
DTSTART;VALUE=DATE-TIME:20140808T103000Z
DTEND;VALUE=DATE-TIME:20140808T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3838@cern.ch
DESCRIPTION:The conventional way of computing string theory amplitudes is
not\nsufficient. The aim of this talk is to define a suitable off-shell\nc
ontinuation of Polyakov approach. Then this off-shell continuation\nwill b
e used to compute mass-renormalization. At the end we will\ngeneralise thi
s method to superstring theory.\n\narxiv: 1311.1257\, 1401.7014\, 1404.625
4\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3838
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3838
END:VEVENT
BEGIN:VEVENT
SUMMARY:Some computations using Off-shell (super)string theory [Part 2]
DTSTART;VALUE=DATE-TIME:20140811T103000Z
DTEND;VALUE=DATE-TIME:20140811T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3840@cern.ch
DESCRIPTION:The conventional way of computing string theory amplitudes is
not\nsufficient. The aim of this talk is to define a suitable off-shell\nc
ontinuation of Polyakov approach. Then this off-shell continuation\nwill b
e used to compute mass-renormalization. At the end we will\ngeneralise thi
s method to superstring theory.\n\narxiv: 1311.1257\, 1401.7014\, 1404.625
4\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3840
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3840
END:VEVENT
BEGIN:VEVENT
SUMMARY:Elliptic genera of non-compact CFTs
DTSTART;VALUE=DATE-TIME:20140825T103000Z
DTEND;VALUE=DATE-TIME:20140825T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3857@cern.ch
DESCRIPTION:We calculate the elliptic genus of two dimensional abelian gau
ged\nlinear sigma models with (2\,2) supersymmetry using localization\ntec
hniques. These models flow in the infrared to non-linear sigma\nmodels who
se target spaces are non-compact Kahler manifolds with U(N)\nisometry and
with an asymptotically linear dilaton direction. In the\nbest studied exam
ple of the supersymmetric cigar CFT\, the elliptic\ngenus is known to be t
he modular completion of a mock-Jacobi form\,\nwhich can be written as an
Appell-Lerch sum. We show that modular\ncompletions of more general Appell
-Lerch sums can also be realized as\nobservables in the cigar CFT.\n\nhttp
s://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3857
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3857
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dilaton Effective Action and Entanglement Entropy
DTSTART;VALUE=DATE-TIME:20140911T103000Z
DTEND;VALUE=DATE-TIME:20140911T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3884@cern.ch
DESCRIPTION:In this talk we will elaborate on techniques used to arrive at
the\nresults [1\, 2] of the previous talk. In general we will show that\n
arguments very similar to the 't Hooft anomaly matching argument give\npow
erful constraints on the entanglement entropy.\n\nReferences:\n\n1. S. Ban
erjee\, ``Trace Anomaly Matching and Exact Results For\n Entanglement En
tropy'' arXiv:1405.4876 [hep-th]. \n2. S. Banerjee\, ``Note On The Dilaton
Effective Action And\n Entanglement Entropy'' arXiv:1406.3038 [hep-th].
\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3884
LOCATION:Colaba Campus A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3884
END:VEVENT
BEGIN:VEVENT
SUMMARY:Resolution of Cosmological Singularities in Higher Spin Gravity
DTSTART;VALUE=DATE-TIME:20140915T103000Z
DTEND;VALUE=DATE-TIME:20140915T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3898@cern.ch
DESCRIPTION:Resolution of cosmological singularities is an important probl
em in\nany full theory of quantum gravity. Three dimensional de Sitter spa
ce\nhas quotients that have big-bang/big-crunch singularities\, while the\
nMilne orbifold is a quotient of flat space (cosmology) with a\nbig-bang/b
ig-crunch singularity. Using the Chern-Simons formulation of\nhigher spin
gravity in 2+1 d de Sitter and flat space we show that\nhigher spin theori
es can effect a simple resolution of the\ncosmological singularities when
one embeds them in 2+1 dimensions.\n\nhttps://indico.tifr.res.in/indico/co
nferenceDisplay.py?confId=3898
LOCATION:
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3898
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase Structure of Higher Spin Black Holes
DTSTART;VALUE=DATE-TIME:20141014T103000Z
DTEND;VALUE=DATE-TIME:20141014T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3940@cern.ch
DESCRIPTION:We revisit the study of the phase structure of higher spin bla
ck holes\ncarried out in arXiv:1210.0284 using the "canonical formalism".
In\nparticular we study the low as well as high temperature regimes. We\ns
how that the Hawking-Page transition takes place in the low\ntemperature r
egime. The thermodynamically favoured phase changes from\nconical surplus
to black holes and then again to conical surplus as we\nincrease temperatu
re. We then show that in the high temperature regime\nthe diagonal embeddi
ng gives the appropriate description. We also give\na map between the para
meters of the theory near the IR and UV fixed\npoints. This makes the "goo
d" solutions near one end map to the "bad"\nsolutions near the other end a
nd vice versa.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?c
onfId=3940
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3940
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalization group\, secular term resummation and AdS (in)stabi
lity
DTSTART;VALUE=DATE-TIME:20141016T103000Z
DTEND;VALUE=DATE-TIME:20141016T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3948@cern.ch
DESCRIPTION:AdS space-time has been numerically observed to be (non-linear
ly)\nunstable with respect to large classes of initial perturbations of\nv
ery small amplitudes. This behavior has been linked to the appearance\nof
growing (secular) terms in non-linear perturbation theory around\nthe AdS
background\, though the relation is far from obvious. I review\nthe genera
lities pertaining to such secular terms\, resummation\nstrategies that end
ow perturbation theory with predictive power\, and\ndescribe applications
of these techniques to the AdS case.\n\nhttps://indico.tifr.res.in/indico/
conferenceDisplay.py?confId=3948
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3948
END:VEVENT
BEGIN:VEVENT
SUMMARY:Logarithmic Corrections to Twisted Indices from the Quantum Entrop
y Function
DTSTART;VALUE=DATE-TIME:20141107T103000Z
DTEND;VALUE=DATE-TIME:20141107T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-3982@cern.ch
DESCRIPTION:We compute logarithmic corrections to the twisted index Bg6 in
four dimensional N=4 and N=8 string theories using the framework of the Q
uantum Entropy Function. We find that these vanish\, matching perfectly wi
th the large--charge expansion of the corresponding microscopic expression
s.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3982
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=3982
END:VEVENT
BEGIN:VEVENT
SUMMARY:From Higher Spins to Strings: A Constructive Approach
DTSTART;VALUE=DATE-TIME:20141113T103000Z
DTEND;VALUE=DATE-TIME:20141113T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4013@cern.ch
DESCRIPTION:Starting from some examples\, I will review various implicatio
ns of\nclassical consistency that have played a key role in the context of
\nhigher-spin theories (Vasiliev's equations) and holography. I will\nthen
review the current understanding higher-spin interactions\ninvolving tota
lly-symmetric higher-spin fields and the associated\nclassification of hig
her-spin algebras generalizing Coleman-Mandula\ntheorem in the context of
AdS/CFT. Finally\, I will discuss the\nextension of this analysis to massi
ve higher spins\, towards a new\nunderstanding of string theory.\n\nhttps:
//indico.tifr.res.in/indico/conferenceDisplay.py?confId=4013
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4013
END:VEVENT
BEGIN:VEVENT
SUMMARY:Causality Constraints on Corrections to the Graviton Three-Point
Coupling
DTSTART;VALUE=DATE-TIME:20141201T060000Z
DTEND;VALUE=DATE-TIME:20141201T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4043@cern.ch
DESCRIPTION:We consider higher derivative corrections to the graviton thre
e-point\ncoupling within a weakly coupled theory of gravity. We argue that
\nthese are constrained by causality by means of a thought experiment\ninv
olving a high energy scattering process. This violation cannot be\nfixed b
y adding conventional particles with spins lower or equal to\ntwo. But\, i
t may be fixed by adding an infinite tower of extra massive\nparticles wit
h higher spins. In AdS theories these causality\nconditions can be traced
back to the positivity of certain energy flux\ncorrelators and this implie
s a constraint on the coefficients of the\nconformal anomaly.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=4043
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4043
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entanglement entropy for gauge theories
DTSTART;VALUE=DATE-TIME:20150122T060000Z
DTEND;VALUE=DATE-TIME:20150122T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4157@cern.ch
DESCRIPTION:We propose a definition for the entanglement entropy of a gaug
e theory on a spatial lattice. Our definition applies to any subset of lin
ks in the lattice\, and is valid for both Abelian and Non-Abelian gauge th
eories. For ZN and U(1) theories\, without matter\, our definition agrees
with a particular case of the definition given by Casini\, Huerta and Rosa
bal. We also argue that in general\, both for Abelian and Non-Abelian theo
ries\, our definition agrees with the entanglement entropy calculated usin
g the replica trick. This definition\, however\, does not agree with some
standard ways to measure entanglement\, like the number of Bell pairs whic
h can be produced by entanglement distillation.\n\nReference: http://arxiv
.org/abs/1501.02593\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay
.py?confId=4157
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4157
END:VEVENT
BEGIN:VEVENT
SUMMARY:Permutation orbifolds and holography
DTSTART;VALUE=DATE-TIME:20150130T060000Z
DTEND;VALUE=DATE-TIME:20150130T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4180@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
4180
LOCATION:A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4180
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic entanglement & constraints on gravitational dynamics
DTSTART;VALUE=DATE-TIME:20150202T060000Z
DTEND;VALUE=DATE-TIME:20150202T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4181@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
4181
LOCATION:A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4181
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermalization with chemical potentials\, and higher spin black h
oles
DTSTART;VALUE=DATE-TIME:20150204T060000Z
DTEND;VALUE=DATE-TIME:20150204T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4196@cern.ch
DESCRIPTION:Quantum quench is considered in 2D CFT's with additional conse
rved\ncharges besides the hamiltonian. Local observables are shown to\nth
ermalize to an ensemble average. The ensemble is universal in the\nsense t
hat is specified by only the conserved charges of the initial\nstate. The
thermalization rate has a universal lower bound\, which\ndepends on these
conserved charges and some algebraic properties of\nthe most relevant ope
rator of the CFT. A holographic interpretation of\nthese observations is p
rovided in terms of higher spin black holes.\n\nhttps://indico.tifr.res.in
/indico/conferenceDisplay.py?confId=4196
LOCATION: AG69
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4196
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entropy current and Eightfold way
DTSTART;VALUE=DATE-TIME:20150205T053000Z
DTEND;VALUE=DATE-TIME:20150205T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4199@cern.ch
DESCRIPTION:Hydrodynamics is the low-energy effective field theory of any
interacting quantum theory\, capturing the long-wavelength fluctuations of
an equilibrium Gibbs density matrix. Conventionally\, one views the effec
tive dynamics in terms of the conserved currents\, which should be express
ed via the constitutive relations in terms of the fluid velocity and the i
ntensive parameters such as the temperature\, chemical potential\, etc.. H
owever\, not all constitutive relations are acceptable\; one has to ensure
that the second law of thermodynamics is satisfied on all physical config
urations. \n\nIn this talk\, I will describe the structure this second la
w constraint imposes at any order in the gradient expansion. The key new
ingredient we introduce is the notion of adiabaticity\, which allows us to
take hydrodynamics off-shell. Adiabatic fluids are such that off-shell dy
namics of the fluid compensates for entropy production. The space of adiab
atic fluids is quite rich\, and admits a decomposition into seven distinct
classes. Together with the dissipative class this establishes the eightfo
ld way of hydrodynamic transport.\n\nhttps://indico.tifr.res.in/indico/con
ferenceDisplay.py?confId=4199
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4199
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fluids : Effective theory and Schwinger-Keldysh
DTSTART;VALUE=DATE-TIME:20150209T053000Z
DTEND;VALUE=DATE-TIME:20150209T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4200@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
4200
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4200
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exact Solutions of 2d Supersymmetric Gauge Theories
DTSTART;VALUE=DATE-TIME:20150224T103000Z
DTEND;VALUE=DATE-TIME:20150224T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4231@cern.ch
DESCRIPTION:We study the dynamics of two-dimensional non-abelian gauge the
ories with N=(0\,2) supersymmetry that include the supersymmetric QCD and
its generalizations. Multiple theories of this class exhibit identical phy
sics at low energies. Interestingly\, as it turns out\, the constraints im
posed by two dimensional conformal symmetry along with modular invariance
are sufficient to completely solve for the low energy physics.\n\nhttps://
indico.tifr.res.in/indico/conferenceDisplay.py?confId=4231
LOCATION: AG69
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4231
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higher spin theories: From Dirac to Vasiliev
DTSTART;VALUE=DATE-TIME:20150305T103000Z
DTEND;VALUE=DATE-TIME:20150305T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4247@cern.ch
DESCRIPTION:This talk will survey the developments in Higher spin theories
since\nthe days of Dirac to Vasiliev equations and end with open issues i
n\nhigher spin theories. In the process a recent work on consistent\nback
grounds for higher spin propagation will be discussed.\n\nhttps://indico.t
ifr.res.in/indico/conferenceDisplay.py?confId=4247
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4247
END:VEVENT
BEGIN:VEVENT
SUMMARY:Causality constraints on corrections to the graviton three point
function coupling
DTSTART;VALUE=DATE-TIME:20150312T053000Z
DTEND;VALUE=DATE-TIME:20150312T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4270@cern.ch
DESCRIPTION:Authors: X. O. Camanho\, J. D. Edelstein\, J. Maldacena and A.
Zhiboedov\nArxiv link: http://arxiv.org/abs/1407.5597\n\nhttps://indico.t
ifr.res.in/indico/conferenceDisplay.py?confId=4270
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4270
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalized BRST transformations
DTSTART;VALUE=DATE-TIME:20150413T103000Z
DTEND;VALUE=DATE-TIME:20150413T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4310@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
4310
LOCATION:A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4310
END:VEVENT
BEGIN:VEVENT
SUMMARY:Knots\, homologies and A-polynomials
DTSTART;VALUE=DATE-TIME:20150421T103000Z
DTEND;VALUE=DATE-TIME:20150421T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4335@cern.ch
DESCRIPTION:I will discuss the direct evaluation of knot invariants using
the\nconnection between Chern-Simons theory and Wess-Zumino conformal fiel
d\ntheory. From these pool of invariants\, I will present how we attempted
\nto write closed form expression for $SU(N)$ quantum racah coefficients\n
involving a symmetric and their conjugate representations. I will\nbriefl
y introduce Khovanov's approach of obtaining homological\ninvariants. Fina
lly\, I will give some idea on recent activities in\nthis mathematical phy
sics area: (i) obtaining superpolynomials\,\nA-polynomials (ii) understand
ing these polynomials from the BPS states\nin string theory\, refined Cher
n-Simons theory and 3-dimensional\ngravity partition functions.\n\nhttps:/
/indico.tifr.res.in/indico/conferenceDisplay.py?confId=4335
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4335
END:VEVENT
BEGIN:VEVENT
SUMMARY:Geroch Group Description of Black Holes
DTSTART;VALUE=DATE-TIME:20150505T090000Z
DTEND;VALUE=DATE-TIME:20150505T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4349@cern.ch
DESCRIPTION:Higher dimensional gravity theories when reduced to two dimens
ions has\ninfinite number of symmetries in it. The symmetry group is calle
d the\nGeroch group. Geroch group allows one to associate space-time\ninde
pendent matrices with gravitational configurations that\neffectively depen
d on only two coordinates. The construction of Geroch\ngroup matrices is d
iscussed for various black hole examples like 5D\nMyers Perry and 5D Kaluz
a Klein BHs. Relation between these Geroch\ngroup matrices and charge matr
ices are also discussed. (Reference:\narxiv hep-th 1408.0875)\n\nhttps://
indico.tifr.res.in/indico/conferenceDisplay.py?confId=4349
LOCATION: AG80
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4349
END:VEVENT
BEGIN:VEVENT
SUMMARY:Geroch Group in Einstein Spaces
DTSTART;VALUE=DATE-TIME:20150518T103000Z
DTEND;VALUE=DATE-TIME:20150518T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4371@cern.ch
DESCRIPTION:In this talk we briefly review the Geroch method of generating
new solutions from given Ricci flat metrics admitting a Killing vector. W
e will then discuss the generalization of this method for Einstein metrics
admitting a Killing vector. The description is given in terms of a non-li
near sigma model in the three dimensional coset space (formed by the orbit
s invariant under the Killing vector). We will discuss the integrability o
f this model for a simple case when the coset space is conformal to R × M
2.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4371
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4371
END:VEVENT
BEGIN:VEVENT
SUMMARY:2 &rarr\; 2 scattering in supersymmetric matter Chern-Simons the
ories at large N
DTSTART;VALUE=DATE-TIME:20150604T103000Z
DTEND;VALUE=DATE-TIME:20150604T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4390@cern.ch
DESCRIPTION:Non-abelian Chern-Simons theories are very rich. When coupled
to matter in the fundamental representation of U(N)\, these theories are e
xactly solvable in the large N limit. We study the most general renormaliz
able N=1 U(N) Chern-Simons gauge theory coupled to a single (generically m
assive) fundamental matter multiplet. At leading order in the `t Hooft lar
ge N limit we present computations and conjectures for the 2 × 2 S matrix
in these theories\; our results apply at all orders in the `t Hooft coupl
ing and the matter self interaction. Our S matrices are in perfect agreeme
nt with the recently conjectured strong weak coupling self duality of this
class of theories. The consistency of our results with unitarity requires
a modification of the usual rules of crossing symmetry in precisely the m
anner anticipated in arXiv:1404.6373\, lending substantial support to the
conjectures of that paper. In a certain range of coupling constants our $S
$ matrices have a pole whose mass vanishes on a self dual codimension one
surface in the space of couplings.\n\nhttps://indico.tifr.res.in/indico/co
nferenceDisplay.py?confId=4390
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4390
END:VEVENT
BEGIN:VEVENT
SUMMARY:Causality constraints from CFT
DTSTART;VALUE=DATE-TIME:20150608T103000Z
DTEND;VALUE=DATE-TIME:20150608T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4393@cern.ch
DESCRIPTION:We take a simple step towards implementing the causality const
raint in\nthe CFT by exploiting connection between unitarity\, causality a
nd\ncrossing symmetry. Most of our computation is restricted to scalar\nco
rrelators and we show that causality constrains the sign of certain\nnon-a
nalytic terms in conformal block expansion. We also discuss\nconnection wi
th dual gravity computation.\n\nhttps://indico.tifr.res.in/indico/conferen
ceDisplay.py?confId=4393
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4393
END:VEVENT
BEGIN:VEVENT
SUMMARY:de Sitter space\, extremal surfaces and the wavefunction of the un
iverse
DTSTART;VALUE=DATE-TIME:20150630T053000Z
DTEND;VALUE=DATE-TIME:20150630T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4425@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
4425
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4425
END:VEVENT
BEGIN:VEVENT
SUMMARY:A topological gauge theory for the entropy current
DTSTART;VALUE=DATE-TIME:20150709T060000Z
DTEND;VALUE=DATE-TIME:20150709T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4447@cern.ch
DESCRIPTION:We focus on the question of how relativistic fluid dynamics sh
ould be\nthought of as a Wilsonian effective field theory emerging from\nS
chwinger-Keldysh path integrals. Taking the basic principles of\nSchwinger
-Keldysh formalism seriously\, we are led to a series of\nremarkable state
ments and a broad programme relating relativistic\nfluid dynamics and topo
logical sigma models. Apart from the intrinsic\ninterest for this programm
e from the non-equilibrium field theory\nviewpoint\, we also emphasise its
relevance to various fundamental\nquestions in black hole physics.\n\nhtt
ps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4447
LOCATION:A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4447
END:VEVENT
BEGIN:VEVENT
SUMMARY:No-perturbative beta function in 2d supersymmetric QCD
DTSTART;VALUE=DATE-TIME:20150710T053000Z
DTEND;VALUE=DATE-TIME:20150710T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4449@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
4449
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4449
END:VEVENT
BEGIN:VEVENT
SUMMARY:A topological gauge theory for the entropy current (Part 2)
DTSTART;VALUE=DATE-TIME:20150715T060000Z
DTEND;VALUE=DATE-TIME:20150715T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4457@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
4457
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4457
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chern-Simon terms\, Noether Charge and Entanglement entropy
DTSTART;VALUE=DATE-TIME:20150720T060000Z
DTEND;VALUE=DATE-TIME:20150720T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4469@cern.ch
DESCRIPTION:I will begin with a review of Wald's Noether charge method to
assign\nBlack hole entropy with a special focus on pure and mixed\ngravita
tional Chern-Simons(CS) terms. I will then describe how this\nmethod can b
e applied to Black hole solutions found in arXiv:1311.2940\nto reproduce t
he parity odd Cardy formula of the dual CFT. In the\nsecond part of the ta
lk\, I will focus on deriving the entanglement\nentropy functional for CS
terms.\n\nReferences : arXiv:1311.2940\,arXiv:1407.6364\, arXiv:1505.02816
\,\narXiv:1507.02298\n\nhttps://indico.tifr.res.in/indico/conferenceDispla
y.py?confId=4469
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4469
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chern-Simon terms\, Noether Charge and Entanglement entropy (Part
2)
DTSTART;VALUE=DATE-TIME:20150722T060000Z
DTEND;VALUE=DATE-TIME:20150722T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4470@cern.ch
DESCRIPTION:I will begin with a review of Wald's Noether charge method to
assign\nBlack hole entropy with a special focus on pure and mixed\ngravita
tional Chern-Simons(CS) terms. I will then describe how this\nmethod can b
e applied to Black hole solutions found in arXiv:1311.2940\nto reproduce t
he parity odd Cardy formula of the dual CFT. In the\nsecond part of the ta
lk\, I will focus on deriving the entanglement\nentropy functional for CS
terms.\n\nReferences : arXiv:1311.2940\,arXiv:1407.6364\, arXiv:1505.02816
\,\narXiv:1507.02298\n\nhttps://indico.tifr.res.in/indico/conferenceDispla
y.py?confId=4470
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4470
END:VEVENT
BEGIN:VEVENT
SUMMARY:Inflation\, CMB and Moduli
DTSTART;VALUE=DATE-TIME:20150723T060000Z
DTEND;VALUE=DATE-TIME:20150723T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4473@cern.ch
DESCRIPTION:A generic feature of inflationary models in supergravity/strin
g constructions is vacuum misalignment for the moduli fields. The associat
ed production of moduli particles leads to an epoch in the post-inflationa
ry history in which the energy density is dominated by cold moduli particl
es. This modification of the post-inflationary history implies that the pr
eferred range for the number of e-foldings between horizon exit of the mod
es relevant for CMB observations and the end of inflation (Nk) depends on
moduli masses. This in turn implies that the precision CMB observables ns
and r are sensitive to moduli masses. We analyse this sensitivity for some
representative models of inflation and find the effect to be very relevan
t for confronting inflationary models with observations.\n\nhttps://indico
.tifr.res.in/indico/conferenceDisplay.py?confId=4473
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4473
END:VEVENT
BEGIN:VEVENT
SUMMARY:Analytic results from conformal bootstrap at large spin
DTSTART;VALUE=DATE-TIME:20150807T060000Z
DTEND;VALUE=DATE-TIME:20150807T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4514@cern.ch
DESCRIPTION:We use analytic conformal bootstrap methods to determine the a
nomalous\ndimension s and OPE coefficients for large spin operators in gen
eral\nconformal field theor ies containing a scalar operator . It is known
\nthat such theories will contain a n infinite sequence of large spin\nope
rators. By considering the case where such operators are separated\nby a t
wist gap from other operators at large spin\, we an alytically\ndetermine
the anomalous dimensions at large spin. To do this we extr\nact an approx
imate expression for the conformal blocks in any\ndimension. We find that
the anomalous dimensions are negative if the\ntwists satisfy unitarity bou
nd\, thus extending the Nachtmann theorem\nto non-zero n. In the large tw
ist limit we find that the anomalous\ndimension becomes universal\, with o
ur result in perf ect agreement\nwith results from two different holograph
ic calculations.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py
?confId=4514
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4514
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent developments on Gravitational Collapse Final States
DTSTART;VALUE=DATE-TIME:20150910T043000Z
DTEND;VALUE=DATE-TIME:20150910T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4545@cern.ch
DESCRIPTION:The final fate of massive collapsing matter clouds has been a
fundamental topic in black hole physics and gravitation theory for past ma
ny years.We discuss the current developments here. While the general theor
y of relativity predicts a necessary occurrence of space-time singularity
in such a scenario\, the formation of event and apparent horizons in colla
pse is very much a subject of current investigations. It is in fact the fo
rmation and behavior of the apparent horizon that decides whether the sing
ularity is enveloped in a black hole\, or it may be a visible for far away
observers in the space-time. We point out that the apparent horizon and t
rapped surfaces formation is determined in terms of initial data for colla
pse and the allowed evolutions by Einstein equations. The black hole and n
aked singularities in gravitational collapse involve key open issues such
as genericity and stability aspects related to these outcomes\, and other
problems in terms of their applications in relativistic\nastrophysics. We
discuss some of these issues and recent developments in this talk.\n\nhttp
s://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4545
LOCATION:TIFR COLABA A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4545
END:VEVENT
BEGIN:VEVENT
SUMMARY: Superstring Field Theories (The Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20150921T060000Z
DTEND;VALUE=DATE-TIME:20150921T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4575@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
4575
LOCATION:A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4575
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Higher Spin Square (The Quantum Space Time Seminar Series)
DTSTART;VALUE=DATE-TIME:20150928T060000Z
DTEND;VALUE=DATE-TIME:20150928T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4582@cern.ch
DESCRIPTION:It is useful to try and study backgrounds of string theory whi
ch exhibit a large unbroken symmetry. In this context\, we describe how th
e unbroken stringy symmetries of the orbifold CFT dual to strings on AdS3
× S3 × T4 can be usefully viewed through the lens of higher spin symm
etry. We find a novel structure - the higher spin square - which is genera
ted by two independent higher spin symmetries. This structure appears to b
e a useful way to also characterise the matter content of the theory.\n\nh
ttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4582
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4582
END:VEVENT
BEGIN:VEVENT
SUMMARY:Local Operators and State Dependence in AdS/CFT (The Quantum Spac
etime Seminar series)
DTSTART;VALUE=DATE-TIME:20151005T060000Z
DTEND;VALUE=DATE-TIME:20151005T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4597@cern.ch
DESCRIPTION:We show how recent versions of the information paradox can be
phrased as precise questions about the existence of operators with certain
properties in the AdS/CFT correspondence. We review an explicit construct
ion of such operators\, but this also has the property that it is state-de
pendent: the correct operators required to describe approximately classica
l bulk degrees of freedom depend on the state of the CFT. We show how this
is necessary even for the eternal black hole and discuss its possible sem
i-classical origins. We describe how this leads to a precise version of th
e ER=EPR proposal. We conclude with several open questions that reveal a t
ension between expectations from effective field theory\, statistical mech
anics\, and unitarity.\n\nhttps://indico.tifr.res.in/indico/conferenceDisp
lay.py?confId=4597
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4597
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nonlinear perturbations of AdS spacetime
DTSTART;VALUE=DATE-TIME:20151008T043000Z
DTEND;VALUE=DATE-TIME:20151008T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4599@cern.ch
DESCRIPTION:I shall review the intricate phenomenology of stable and unsta
ble behaviors displayed by small perturbations of Anti-de Sitter space-tim
e\, and the corresponding mathematical structures one discovers while syst
ematically implementing small amplitude expansions for AdS-scalar field sy
stems.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=45
99
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4599
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anomalous transport at weak coupling (The Quantum Spacetime Semin
ar series)
DTSTART;VALUE=DATE-TIME:20151012T060000Z
DTEND;VALUE=DATE-TIME:20151012T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4607@cern.ch
DESCRIPTION:Recent investigations has shown that the presence of quantum a
nomalies in the microscopic theory modify macroscopic hydrodynamic equatio
ns of the theory. We use perturbative methods of finite temperature field
theory to derive transport coefficients sensitive to the anomalies of the
microscopic theory. This is a complementary and a direct method to that wh
ich relies on symmetries and the `consistency of the Euclidean vacuum'. Us
ing the direct method we show how\, and in which cases the approach using
the `consistency of the Euclidean vacuum' breaks down. Finally we show tha
t in the presence of anomalies in 1+1 dimensional Weyl gas\, the charge di
spersion mode acquires a speed which is equal to half the speed of light.\
n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4607
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4607
END:VEVENT
BEGIN:VEVENT
SUMMARY:A test of bosonization at the level of four-point functions in Che
rn-Simons vector models (The Quantum Spacetime Seminar series)
DTSTART;VALUE=DATE-TIME:20151019T060000Z
DTEND;VALUE=DATE-TIME:20151019T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4617@cern.ch
DESCRIPTION:We study four-point functions in Chern-Simons vector models in
the large N limit. We compute the four-point function of the scalar prima
ry to all orders in the `t Hooft coupling λ=N/k in U(N)k Chern-Simons the
ory coupled to a fundamental fermion\, in both the critical and non-critic
al theory\, for a particular case of the external momenta. These theories
cover the entire 3-parameter "quasi-boson" and 2-parameter "quasi-fermion"
families of 3-dimensional quantum field theories with a slightly-broken h
igher spin symmetry. Our results are consistent with the celebrated bosoni
zation duality\, as we explicitly verify by calculating four-point functio
ns in the free critical and non-critical bosonic theories.\n\nhttps://indi
co.tifr.res.in/indico/conferenceDisplay.py?confId=4617
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4617
END:VEVENT
BEGIN:VEVENT
SUMMARY: On 2d Conformal Field Theories with Two Characters (The Quantum S
pacetime Seminar series)
DTSTART;VALUE=DATE-TIME:20151026T060000Z
DTEND;VALUE=DATE-TIME:20151026T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4627@cern.ch
DESCRIPTION:The classification of rational conformal field theories will b
e discussed with emphasis on theories with two characters. A subset of th
ese was classified in 1988\, we find what appear to be some more examples\
, as well as some parameter values where we can rule out the existence of
possible theories.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.
py?confId=4627
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4627
END:VEVENT
BEGIN:VEVENT
SUMMARY:"Entanglement in weakly coupled gauge theories"
DTSTART;VALUE=DATE-TIME:20151029T060000Z
DTEND;VALUE=DATE-TIME:20151029T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4635@cern.ch
DESCRIPTION:The first half of this talk will focus on defining entanglemen
t entropy in lattice gauge theories.The second half will present recent re
sults concerning generic\, universal logarithmic terms that exist in weak-
coupling limits of all gauge theories. We will particularly focus on 2+1-
dimensional theories where such a logarithmic term dominates the universal
part of entanglement entropy and represents a generalization of topologic
al entanglement entropy to theories with continuous gauge group.\n\nhttps:
//indico.tifr.res.in/indico/conferenceDisplay.py?confId=4635
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4635
END:VEVENT
BEGIN:VEVENT
SUMMARY: "Disorder operators in Chern-Simons-fermion theories"
DTSTART;VALUE=DATE-TIME:20151030T043000Z
DTEND;VALUE=DATE-TIME:20151030T060000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4640@cern.ch
DESCRIPTION:We compute the scaling dimensions of a large class of disorder
operators ("monopoles") in the planar limit of CS-fermion theories.The li
ghtest such operator is shown to have scaling dimension (2/3) k^{3/2} wher
e k is the CS level. The computation is based on recently developed techn
iques for solving CS-matter at all 't Hooft couplings. The desired operato
r dimensions are obtained by finding complex saddles in the low-temperatur
e phase of the CS-fermion path integral in a monopole background. We will
also discuss the implications of this result to the 3D bosonization duali
ties.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=464
0
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4640
END:VEVENT
BEGIN:VEVENT
SUMMARY:Null Fluid : A new view to Galilean Fluid (The Quantum Spacetime
Seminar series)
DTSTART;VALUE=DATE-TIME:20151105T060000Z
DTEND;VALUE=DATE-TIME:20151105T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4644@cern.ch
DESCRIPTION:We construct a relativistic system\, which we call null fluid
and show that it is in one-to-one correspondence with a Galilean fluid liv
ing in one lower dimension. The correspondence is based on light cone redu
ction\, which is known to reduce the Poincare symmetry of a theory to Gali
lean in one lower dimension. We show that the proposed null fluid and the
corresponding Galilean fluid have exactly same symmetries\, thermodynamics
\, constitutive relations\, and equilibrium partition to all orders in der
ivative expansion.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.
py?confId=4644
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4644
END:VEVENT
BEGIN:VEVENT
SUMMARY:Perturbative type II amplitudes for BPS interactions (The Quantum
Spacetime Seminar series)
DTSTART;VALUE=DATE-TIME:20151116T060000Z
DTEND;VALUE=DATE-TIME:20151116T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4657@cern.ch
DESCRIPTION:I shall consider the perturbative contributions to BPS four gr
aviton interactions in toroidally compactified type II string theory\, an
d derive Poisson equations satisfied by these moduli dependent string ampl
itudes. These equations have eigen-values that are completely determined b
y the structure of the integrands of the multi-loop amplitudes. The source
terms are given by boundary terms of the moduli space of Riemann surfaces
corresponding to both separating and non-separating nodes.\n\nhttps://ind
ico.tifr.res.in/indico/conferenceDisplay.py?confId=4657
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4657
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exact asymmetric Skyrmion through generalized analytic functions
DTSTART;VALUE=DATE-TIME:20151119T043000Z
DTEND;VALUE=DATE-TIME:20151119T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4667@cern.ch
DESCRIPTION:Skyrmion magnetic patterns in helimagnets is a subject of imme
nse contemporary interest from both theoretical and experimental point of
view [PRL'09a\,'09b\,'10\, Science'09\,Nature'10\,'06\,'03\,'01]. However
\, the original idea of Skyrmions in 2d was put forward 40 years ego by Be
lavin and Polyakov (BP) [JETP'75]\, where exact Skyrmion solutions could b
e given by any analytic functions.\n\nWe propose an innovative extension o
f the BP solution for an anisotropic ferromagnet\, based on a geometric (i
n-)equality with universal appeal\, which takes the exact asymmetric solut
ions to a new class of complex functions beyond analyticity\, linking the
Skyrmion to the contemporary d-bar problem\, with potential of generalizi
ng the conformal QFT models and related algebraic structures. An applicat
ion of our result in the construction of asymmetric Skyrmions\, likely to
be detected in precision experiments in helimagnets\, is proposed.\n\nhttp
s://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4667
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4667
END:VEVENT
BEGIN:VEVENT
SUMMARY:2D Critical Quench\, Thermalization and Non-Universality
DTSTART;VALUE=DATE-TIME:20151120T060000Z
DTEND;VALUE=DATE-TIME:20151120T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4669@cern.ch
DESCRIPTION:I will talk about our last paper and our current work. In arXi
v: 1501.04580\, we studied the long time behaviour of local observables fo
llowing a quantum quench in 1+1 dimensional conformal field theories posse
ssing additional conserved charges besides the energy. We showed exponenti
al approach to equilibrium of finite sub-interval characterized by a tempe
rature and chemical potentials defined in terms of the quenched state. In
our ongoing work\, we compute the exact wavefunction that results from a q
uantum quench to a vanishing mass\, in a large class of examples The resul
ting wavefunction is of a generalized Calabrese-Cardy form i.e.\, conforma
l boundary state deformed by an infinite number of charges. Special squeez
ed states with small chemical potentials show equilibration to a Generaliz
ed Gibbs Ensemble(GGE) as proved in the above mentioned paper. By contrast
\, with general pre-quench states\, including the ground state\, the chemi
cal potentials are not small\; exact correlators in these cases\, although
equilibrating at long times\, do not generically have a simple thermal or
GGE form even at large distances. The main lesson is that in 2D critical
quench\, long time and large distance physics can be sensitive to perturba
tions by high dimension operators\, contrasting general Wilsonian lore.\n\
nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4669
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4669
END:VEVENT
BEGIN:VEVENT
SUMMARY:On Critical Exponents without Feynman diagrams (The Quantum Space
time Seminar series)
DTSTART;VALUE=DATE-TIME:20151123T060000Z
DTEND;VALUE=DATE-TIME:20151123T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4670@cern.ch
DESCRIPTION:In order to achieve a better analytic handle on the modern con
formal bootstrap program\, we re-examine and extend the pioneering 1974 wo
rk of Polyakov's\, which was based on consistency between the operator pro
duct expansion and unitarity. As in the bootstrap approach\, this method d
oes not depend on evaluating Feynman diagrams. We show how this approach c
an be used to compute the anomalous dimensions of certain operators in the
O(n) model at the Wilson-Fisher fixed point in 4-ε dimensions up to O(ε
2).\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4670
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4670
END:VEVENT
BEGIN:VEVENT
SUMMARY:Symmetry breaking in planar QED (Special STMP Seminar)
DTSTART;VALUE=DATE-TIME:20151127T060000Z
DTEND;VALUE=DATE-TIME:20151127T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4687@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
4687
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4687
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hilbert Series and Black Hole Microstate Counting (The Quantum Sp
acetime Seminar series)
DTSTART;VALUE=DATE-TIME:20151130T060000Z
DTEND;VALUE=DATE-TIME:20151130T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4690@cern.ch
DESCRIPTION:Exact results for the BPS index are known for a class of BPS d
yons in type II string theory compactified on a six dimensional torus. In
a previous paper we had set up the problem of counting the same BPS states
in a duality frame in which the states carry only Ramond-Ramond charges.
We explicitly counted the number of states carrying the lowest possible ch
arges and find agreement with the result obtained in other duality frames.
Furthermore\, we found that after factoring out the supermultiplet struct
ure\, each of these states carry zero angular momentum. In the recent pape
r we have extended it to other small charges but with non- abelian gauge f
ields. It all boils down to solving multivariate polynomial equations and
Hilbert series provides a way to classify the building blocks (the Monomia
ls).\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4690
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4690
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hilbert Series and Black Hole Microstate Counting (Part 2) (The Q
uantum Spacetime Seminar series)
DTSTART;VALUE=DATE-TIME:20151202T060000Z
DTEND;VALUE=DATE-TIME:20151202T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4698@cern.ch
DESCRIPTION:Exact results for the BPS index are known for a class of BPS d
yons in type II string theory compactified on a six dimensional torus. In
a previous paper we had set up the problem of counting the same BPS states
in a duality frame in which the states carry only Ramond-Ramond charges.
We explicitly counted the number of states carrying the lowest possible ch
arges and find agreement with the result obtained in other duality frames.
Furthermore\, we found that after factoring out the supermultiplet struct
ure\, each of these states carry zero angular momentum. In the recent pape
r we have extended it to other small charges but with non- abelian gauge f
ields. It all boils down to solving multivariate polynomial equations and
Hilbert series provides a way to classify the building blocks (the Monomia
ls).\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4698
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4698
END:VEVENT
BEGIN:VEVENT
SUMMARY:Monte Carlo Studies of Dynamical Compactification of Extra Dimensi
ons in a Model of Non-perturbative String Theory
DTSTART;VALUE=DATE-TIME:20151231T043000Z
DTEND;VALUE=DATE-TIME:20151231T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4735@cern.ch
DESCRIPTION:The IIB matrix model has been proposed as a nonperturbative de
finition of superstring theory. In this work\, we study the Euclidean vers
ion of this model in which extra dimensions can be dynamically compactifie
d if a scenario of the spontaneous breakdown of the SO(10) rotational symm
etry is realized. Monte Carlo calculations of the Euclidean IIB matrix mod
el suffer from a very strong complex action problem due to the large fluct
uations of the complex phase of the Pfaffian after integrating out the fer
mion. We employ the factorization method to achieve the effective sampling
. We report on preliminary results that can be compared with previous stud
ies of the rotational symmetry breakdown using the Gaussian expansion meth
od. \n\nReference: arXiv:1509.05079\n\nhttps://indico.tifr.res.in/indico/c
onferenceDisplay.py?confId=4735
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4735
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strange Metals and Black Holes (The Quantum Spacetime Seminar ser
ies)
DTSTART;VALUE=DATE-TIME:20160105T060000Z
DTEND;VALUE=DATE-TIME:20160105T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4760@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
4760
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4760
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bootstrapping 2D CFTs in the Semiclassical Limit
DTSTART;VALUE=DATE-TIME:20160107T043000Z
DTEND;VALUE=DATE-TIME:20160107T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4767@cern.ch
DESCRIPTION:We study two dimensional conformal field theories in the semic
lassical limit. In this limit\, the four-point function at generic cross r
atio is dominated by only a single intermediate primary along with its des
cendants\, and the crossing equations simplify drastically. For a four-poi
nt function receiving sufficiently small contributions from the light prim
aries\, the structure constants involving heavy primaries follow a general
ized Cardy formula. Applying our results to the four-point function of the
Z2 twist field in the symmetric product orbifold\, we produce the Hellerm
an bound and the Cardy formula with higher order corrections that is valid
for $h \\geq c/12$."\n\nhttps://indico.tifr.res.in/indico/conferenceDispl
ay.py?confId=4767
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4767
END:VEVENT
BEGIN:VEVENT
SUMMARY:Superconformal Indices and BPS Particles
DTSTART;VALUE=DATE-TIME:20160108T060000Z
DTEND;VALUE=DATE-TIME:20160108T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4777@cern.ch
DESCRIPTION:We conjecture a precise relationship between a limit of the su
perconformal index of 4d N = 2 field theories\, and the spectrum of BPS pa
rticles on the Coulomb branch. As an application\, we compute the indices
of all Argyres-Douglas theories and identify the underlying 2d chiral alge
bras in various cases.\n\nhttps://indico.tifr.res.in/indico/conferenceDisp
lay.py?confId=4777
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4777
END:VEVENT
BEGIN:VEVENT
SUMMARY:Particle-Vortex Duality of 2+1D Dirac fermions\, from electric-ma
gnetic duality of 3+1D topological insulators (The Quantum Spacetime Semi
nar series)
DTSTART;VALUE=DATE-TIME:20160108T103000Z
DTEND;VALUE=DATE-TIME:20160108T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4780@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
4780
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4780
END:VEVENT
BEGIN:VEVENT
SUMMARY: 2D superconformal bootstrap: Part I (The Quantum Spacetime Sem
inar series)
DTSTART;VALUE=DATE-TIME:20160111T060000Z
DTEND;VALUE=DATE-TIME:20160111T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4781@cern.ch
DESCRIPTION:In this talk we will tie together several topics: (1) constrai
ning the low energy dynamics of supersymmetric theories through scattering
amplitudes (2) double scaled little string theory (3) the conformal boots
trap. We will begin by investigating superamplitudes in maximal and half-m
aximal supergravity theories\, resulting in certain supersymmetry non-norm
alization theorems on the derivative expansion of the quantum effective ac
tion of type II string theory compactified on the K3 surface. This leads t
o an exact result on correlation functions in the 2D CFT described by the
nonlinear sigma model on K3 surface (the K3 CFT). We then turn to correlat
ors of BPS operators in the 2D N=2 cigar coset CFT\, closely related to ma
ssless amplitudes of double scaled little string theory. This leads to an
exact relation between BPS superconformal blocks in two dimensions and the
bosonic Virasoro conformal blocks. These ingredients will be fed into the
numerical bootstrap program\, applied to 2D (4\,4) superconformal theorie
s\, particularly the K3 CFT. Details of the numerical bootstrap will be di
scussed in part II.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay
.py?confId=4781
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4781
END:VEVENT
BEGIN:VEVENT
SUMMARY:2D superconformal bootstrap: Part II
DTSTART;VALUE=DATE-TIME:20160111T103000Z
DTEND;VALUE=DATE-TIME:20160111T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4792@cern.ch
DESCRIPTION:I will first review the general idea of numerical bootstrap\,
and explain what kind of information about the CFT data can be obtained wi
th present day techniques. I then proceed with bootstrapping the K3 CFT\,
and derive moduli-dependent bounds on the gaps in the operator spectrum\,
and compare with physical expectations. One main focus of this talk will b
e put on explaining the apparent difficulties in numerically bootstrapping
the K3\, and their resolutions.\n\nhttps://indico.tifr.res.in/indico/conf
erenceDisplay.py?confId=4792
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4792
END:VEVENT
BEGIN:VEVENT
SUMMARY:Argyres-Douglas theories\, M5 branes and hypersurface singulariti
es
DTSTART;VALUE=DATE-TIME:20160112T060000Z
DTEND;VALUE=DATE-TIME:20160112T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4795@cern.ch
DESCRIPTION:Argyres-Douglas theories are ubiquitous 4d N=2 superconformal
field theories first discovered as nontrivial IR fixed points of 4d N=2 su
persymmetric gauge theories. They have mutually non-local massless BPS sta
tes and in general do not have a weak coupling expansion. In this talk\, I
will discuss the string/M theory constructions of Argyres-Douglas theorie
s\, in particular from M5 branes and IIB hypersurface singularities. We sh
all also see a curious mathematical equivalence between certain singular H
itchin systems (governing the configuration of M5 branes) and cDV (compoun
d Du Val) singularities (probed by type IIB string)\, established via Argy
res-Douglas theories.\n\nhttps://indico.tifr.res.in/indico/conferenceDispl
ay.py?confId=4795
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4795
END:VEVENT
BEGIN:VEVENT
SUMMARY: 2D superconformal bootstrap: Part II
DTSTART;VALUE=DATE-TIME:20160114T103000Z
DTEND;VALUE=DATE-TIME:20160114T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4807@cern.ch
DESCRIPTION:In this talk we will tie together several topics: (1) constrai
ning the low energy dynamics of supersymmetric theories through scattering
amplitudes (2) double scaled little string theory (3) the conformal boots
trap. We will begin by investigating superamplitudes in maximal and half-m
aximal supergravity theories\, resulting in certain supersymmetry non-norm
alization theorems on the derivative expansion of the quantum effective ac
tion of type II string theory compactified on the K3 surface. This leads t
o an exact result on correlation functions in the 2D CFT described by the
nonlinear sigma model on K3 surface (the K3 CFT). We then turn to correlat
ors of BPS operators in the 2D N=2 cigar coset CFT\, closely related to ma
ssless amplitudes of double scaled little string theory. This leads to an
exact relation between BPS superconformal blocks in two dimensions and the
bosonic Virasoro conformal blocks. These ingredients will be fed into the
numerical bootstrap program\, applied to 2D (4\,4) superconformal theorie
s\, particularly the K3 CFT. Details of the numerical bootstrap will be di
scussed in part II.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay
.py?confId=4807
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4807
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic disorder and localization (The Quantum Spacetime Semi
nar series)
DTSTART;VALUE=DATE-TIME:20160118T060000Z
DTEND;VALUE=DATE-TIME:20160118T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4815@cern.ch
DESCRIPTION:Here we would discuss various aspects of introducing disorder
in a simple holographic model. I would discuss localization and transport
around a disordered fixed point. I would also discuss some finite temperat
ure aspect of these solutions.\n\nhttps://indico.tifr.res.in/indico/confer
enceDisplay.py?confId=4815
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4815
END:VEVENT
BEGIN:VEVENT
SUMMARY:Edge states\, Horizon states and moving boundaries
DTSTART;VALUE=DATE-TIME:20160121T060000Z
DTEND;VALUE=DATE-TIME:20160121T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4821@cern.ch
DESCRIPTION:``God made the bulk\, but the devil put the boundaries'' So s
aid W. Pauli.\n\nOn boundary of some bulk there generically arises edge st
ates localised at the boundary. The play important role in blackhole state
s\, quantum hall states\, in ads/cft as well as several other contexts\, l
eading to novel behaviour of the systems. We will point out the origin of
these and consider specifically fermionic edge states in simple cases. We
also consider novel situations when the boundaries are moving.\n\nhttps://
indico.tifr.res.in/indico/conferenceDisplay.py?confId=4821
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4821
END:VEVENT
BEGIN:VEVENT
SUMMARY:What is the dual of two entangled CFTs?
DTSTART;VALUE=DATE-TIME:20160125T090000Z
DTEND;VALUE=DATE-TIME:20160125T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4825@cern.ch
DESCRIPTION:It has been conjectured that the eternal AdS black hole is dua
l to two entangled copies of a CFT. But such a dual map leads to contradi
ctions when we consider the process of Hawking emission. We will discuss t
hese contradictions. We will also discuss the picture of Jevicki et al wh
ere the duality map is nonlocal between the L and R wedges. Under such a m
ap one can use the eternal hole to compute thermal averages\, but not to a
rgue for a dynamical picture of wormholes.\n\nhttps://indico.tifr.res.in/i
ndico/conferenceDisplay.py?confId=4825
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4825
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lorentz Invariance vs Principle of Equivalence (Quantum Spacetime
Seminar)
DTSTART;VALUE=DATE-TIME:20160125T060000Z
DTEND;VALUE=DATE-TIME:20160125T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4830@cern.ch
DESCRIPTION:I will discuss a class of theories that arise as generalizatio
ns of general relativity when one demands the principle of equivalence (na
mely\, that the metric is locally Minkowski and the connection is vanishin
g) but not necessarily that the metric derivatives are zero. A huge class
of theories of this type with nice action principles (and many times simpl
e field equations that generalize Einstein's equation) exist.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=4830
LOCATION:DTP Seminar Room A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4830
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lorentz Invariance vs Principle of Equivalence (Quantum Spacetime
Seminar)
DTSTART;VALUE=DATE-TIME:20160201T060000Z
DTEND;VALUE=DATE-TIME:20160201T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4841@cern.ch
DESCRIPTION:I will discuss a class of theories that arise as generalizatio
ns of general relativity when one demands the principle of equivalence (na
mely\, that the metric is locally Minkowski and the connection is vanishin
g) but not necessarily that the metric derivatives are zero. A huge class
of theories of this type with nice action principles (and many times simpl
e field equations that generalize Einstein's equation) exist.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=4841
LOCATION:DTP Seminar Room A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4841
END:VEVENT
BEGIN:VEVENT
SUMMARY:Weyl Anomalies and Cosmology (Quantum Spacetime Seminar) [Via Skyp
e]
DTSTART;VALUE=DATE-TIME:20160205T090000Z
DTEND;VALUE=DATE-TIME:20160205T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4842@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
4842
LOCATION:DTP Seminar Room A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4842
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological sigma models and fluid dynamics (Quantum Spacetime Sem
inar)
DTSTART;VALUE=DATE-TIME:20160208T060000Z
DTEND;VALUE=DATE-TIME:20160208T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4847@cern.ch
DESCRIPTION:I focus on the question of how relativistic fluid dynamics
should be thought of as a Wilsonian effective field theory emerging from S
chwinger-Keldysh path integrals. Taking the basic principles of Schwinger-
Keldysh formalism seriously\, we are led to a series of remarkable stateme
nts and a broad programme relating relativistic fluid dynamics and topolo
gical sigma models. Apart from the intrinsic interest for this programme f
rom the non-equilibrium field theory viewpoint\, we will also emphasise it
s relevance to various fundamental questions in black hole physics.\n\nRef
erences : arXiv:1412.1090\, arXiv:1502.00636\, arXiv:1510.02494\, arXiv
:1511.07809\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?conf
Id=4847
LOCATION:DTP Seminar Room A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4847
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological sigma models and fluid dynamics - Paart II (Quantum S
pacetime Seminar)
DTSTART;VALUE=DATE-TIME:20160209T043000Z
DTEND;VALUE=DATE-TIME:20160209T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4851@cern.ch
DESCRIPTION:I focus on the question of how relativistic fluid dynamics
should be thought of as a Wilsonian effective field theory emerging from S
chwinger-Keldysh path integrals. Taking the basic principles of Schwinger-
Keldysh formalism seriously\, we are led to a series of remarkable stateme
nts and a broad programme relating relativistic fluid dynamics and topolo
gical sigma models. Apart from the intrinsic interest for this programme f
rom the non-equilibrium field theory viewpoint\, we will also emphasise it
s relevance to various fundamental questions in black hole physics.\n\nRef
erences : arXiv:1412.1090\, arXiv:1502.00636\, arXiv:1510.02494\, arXiv
:1511.07809\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?conf
Id=4851
LOCATION:DTP Seminar Room A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4851
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Hall Matrix Models (Quantum Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20160222T060000Z
DTEND;VALUE=DATE-TIME:20160222T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4873@cern.ch
DESCRIPTION:I'll describe a simple matrix model that describes certain Abe
lian and on-Abelian quantum Hall states. The matrix model arises from the
dynamics of vortices in Chern-Simons theories. The dynamics of this matrix
model capture aspects of the WZW model which lives on the boundary.\n\nh
ttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4873
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4873
END:VEVENT
BEGIN:VEVENT
SUMMARY:Causality constraints in Conformal Field Theory (Quantum Spacetime
Seminar)
DTSTART;VALUE=DATE-TIME:20160225T060000Z
DTEND;VALUE=DATE-TIME:20160225T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4875@cern.ch
DESCRIPTION:Causality places non-trivial constraints on QFTs in Lorentzian
signature\, for example fixing sign of certain terms in the low energy La
grangian. For the case of CFT\, We show how such constraints are encoded
in crossing symmetry of euclidean correlators and derive analogous analyti
c constraints.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?c
onfId=4875
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4875
END:VEVENT
BEGIN:VEVENT
SUMMARY:Surface transport in finite lumps of stationary relativistic fluid
(Quantum Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20160304T043000Z
DTEND;VALUE=DATE-TIME:20160304T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4887@cern.ch
DESCRIPTION:In this talk we will discuss the surface transport properties
of stationary localized configurations of relativistic fluids to the first
two non-trivial orders in a derivative expansion. By demanding that these
finite lumps of relativistic fluid are described by a thermal partition f
unction with arbitrary stationary background metric and gauge fields\, we
find several constraints among surface transport coefficients. At leading
order\, besides recovering the surface thermodynamics\, we will discuss a
generalization of the Young-Laplace equation for relativistic fluid surfac
es. This will be further generalized in the context of super-fluids. At th
e next order\, for uncharged fluids in 3+1 dimensions\, we will see that b
esides the 3 independent bulk transport coefficients previously known\, a
generic localized configuration is characterized by 3 additional surface t
ransport coefficients. Finally\, as an application\, we will discuss the e
ffect of temperature dependence of surface tension on some explicit exampl
es of localized fluid configurations\, which are dual to certain non-trivi
al black hole solutions via the AdS/CFT correspondence.\n\nhttps://indico.
tifr.res.in/indico/conferenceDisplay.py?confId=4887
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4887
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anomalous dimensions in epsilon expansion for the Gross-Neveu CFT
(Quantum Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20160307T060000Z
DTEND;VALUE=DATE-TIME:20160307T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4888@cern.ch
DESCRIPTION:Using the techniques developed by Rychkov and Tan (hep-th/1505
.00963)\, we compute the leading order anomalous dimensions of a class of
composite primary operators in $2+\\epsilon$ dimensions for the Gross-Neve
u CFT. The method adopted entails only use of conformal symmetry and no re
course to Feynman diagrams.[based on http://arxiv.org/abs/1510.04887]\n\nh
ttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4888
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4888
END:VEVENT
BEGIN:VEVENT
SUMMARY:N=4 conformal supergravity (Quantum Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20160314T060000Z
DTEND;VALUE=DATE-TIME:20160314T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4902@cern.ch
DESCRIPTION:We will discuss the techniques of conformal supergravity and h
ow one can use it to construct an off-shell formulation of Poincare superg
ravity. We will discuss the difficulties encountered in the off-shell form
ulation of conformal supergravity with N=4 supersymmetries in four dimensi
ons. We will discuss a way to get around the difficulties. In the end we w
ill discuss our results\, compare it with an earlier known result and disc
uss some future directions.\n\nhttps://indico.tifr.res.in/indico/conferenc
eDisplay.py?confId=4902
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4902
END:VEVENT
BEGIN:VEVENT
SUMMARY:Conformal bootstrap using unitary blocks (Quantum Spacetime Semina
r)
DTSTART;VALUE=DATE-TIME:20160321T060000Z
DTEND;VALUE=DATE-TIME:20160321T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4918@cern.ch
DESCRIPTION:Modern methods in conformal bootstrap have led to the most acc
urate numerical estimate of certain critical exponents of the 3d Ising mod
el. Analytic results\, however\, are few. For instance\, modern methods ar
e unable to produce the anomalous dimension of φ2 at the Wilson-Fisher po
int. I will re-visit and extend Polyakov's seminal 1973 work which uses a
different set of building blocks and which can produce the ε2 anomalous d
imension of all (including arbitrary spin) double field operators in this
theory analytically.\n\nhttps://indico.tifr.res.in/indico/conferenceDispla
y.py?confId=4918
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4918
END:VEVENT
BEGIN:VEVENT
SUMMARY:AdS-CFT and RG-flow (Quantum Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20160328T060000Z
DTEND;VALUE=DATE-TIME:20160328T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4930@cern.ch
DESCRIPTION:I will try to convince you that AdS-CFT forces us to rethink a
bout RG flow and consider its possible generalisation to many different si
tuations. One of the manifestations of this generalised RG flow is the exi
stence of novel monotonicity theorems which go beyond Zamolodchikov's c-th
eorem.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=49
30
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4930
END:VEVENT
BEGIN:VEVENT
SUMMARY:Describing Codimension two defects of Theory X (Special String The
ory and Mathematical Physics Seminar)
DTSTART;VALUE=DATE-TIME:20160331T060000Z
DTEND;VALUE=DATE-TIME:20160331T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4935@cern.ch
DESCRIPTION:A class of codimension two defects operators of the six dimens
ional (0\,2) SCFT X[j] (j is semi-simple lie algebra of type A\,D\,E) play
an important role in the construction of several SCFTs in four and three
dimensions. In four dimensions\, these are the theories that have come to
be known as “Class S” theories. They are labelled by a choice of a pun
ctured Riemann surface and the collection of codimension two defects inser
ted at punctures on the Riemann surface. I will describe properties of a s
ingle codimension two defect both without and with mass deformation. In th
e course of the talk\, I will also define the notion of a “Rigid” 3d N
=4 SCFT and describe some novel consequences that follow from the existenc
e of these SCFTs.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.p
y?confId=4935
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4935
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exact WKB analysis of &Omega\;-deformed Seiberg-Witten Theory (Qua
ntum Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20160404T060000Z
DTEND;VALUE=DATE-TIME:20160404T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4940@cern.ch
DESCRIPTION:We study N=2 Seiberg-Witten theory coupled to 0 ≤ Nf ≤ 4 f
lavours. Using 4D-2D relation we derive the differential equations satisfi
ed by ε1 and ε2 deformed instanton partition functions in each of these
cases. In the semi-classical limit we show that these differential equatio
ns take a form amenable to exact WKB analysis. We compute the monodromy gr
oup associated to the respective differential equations in terms of ε1-de
formed and Borel resummed Seiberg-Witten data. For each case we study pair
s of Stokes graphs that are related by flips and pops\, and show that the
monodromy group allows one to derive the Stokes automorphisms that arise a
s the phase of ε1 is varied.\n\nhttps://indico.tifr.res.in/indico/confere
nceDisplay.py?confId=4940
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4940
END:VEVENT
BEGIN:VEVENT
SUMMARY:S-duality\, triangle groups and modular anomalies in N=2 SQCD (Qua
ntum Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20160411T060000Z
DTEND;VALUE=DATE-TIME:20160411T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4963@cern.ch
DESCRIPTION:We study N=2 superconformal theories with gauge group SU(N) an
d 2N fundamental flavours in a locus of the Coulomb branch with a Z_N symm
etry.In this special vacuum\, we calculate the prepotential\, the dual per
iods\, and the period matrix using equivariant localization. In the confor
mal limit\, we find that the period matrix is completely specified by [N/2
] effective couplings on which the S-duality group acts as a generalized t
riangle group. In addition\, we propose a non-perturbatively exact map bet
ween each effective coupling and the bare coupling in terms of the hauptmo
dul of the corresponding triangle group. For N=2\, 3\, 4 and 6\, all the S
-duality groups are arithmetic Hecke groups which contain a subgroup that
is also a congruence subgroup of the modular group PSL(2\,Z). For these th
eories\, we introduce mass deformations that respect the symmetries of the
special vacuum and show that the constraints arising from S-duality allow
one to resum instanton contributions to these observables in terms of mer
omorphic modular functions which solve modular anomaly equations.\n\nhttps
://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4963
LOCATION:DTP Seminar Room A-304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4963
END:VEVENT
BEGIN:VEVENT
SUMMARY:Smooth Causal Patches for AdS Black Holes
DTSTART;VALUE=DATE-TIME:20160413T083000Z
DTEND;VALUE=DATE-TIME:20160413T093000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4974@cern.ch
DESCRIPTION:We review the paradox of low energy excitations about an AdS b
lack hole. An appropriately chosen unitary operator in the boundary theory
can create a locally strong excitation near the black hole horizon\, whos
e global energy is small as a result of the gravitational redshift. The pa
radox is that this seems to violate a general rule of statistical mechanic
s\, which states that an operator with energy parametrically smaller than
$k T$ cannot create a significant excitation in a thermal system. When we
carefully examine the position dependence of the boundary unitary operator
that produces the excitation and the bulk observable necessary to detect
the anomalously large effect\, we find that they do not both fit in a sing
le causal patch. This follows from a remarkable property of position space
AdS correlators that we establish explicitly\, and resolves the paradox i
n a generic state of the system\, since no combination of observers can bo
th create the excitation and observe its effect. As a special case of our
analysis\, we show how this resolves the ``Born rule'' paradox of arXiv:15
06.01337 and we verify our solution using an independent\ncalculation. We
then consider boundary states that are finely tuned to display a spontaneo
us excitation outside the causal patch of the infalling observer\, and we
propose a version of causal patch complementarity in AdS/CFT that resolves
the paradox for such states as well.\n\nhttps://indico.tifr.res.in/indico
/conferenceDisplay.py?confId=4974
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4974
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ab-initio Holography
DTSTART;VALUE=DATE-TIME:20160415T043000Z
DTEND;VALUE=DATE-TIME:20160415T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4971@cern.ch
DESCRIPTION:In this talk\, I will review our recent work on attempts of fi
rst principle construction of holographic duals for field theories relevan
t to condensed matter systems using renormalization group approaches. In p
articular\, I will show how to implement the procedure for lattice U(N) ve
ctor models of complex bosons (in the large N limit) and find the bulk equ
ation of motions with dynamic bi-local fields starting from the field theo
ry. Solving the equations of motions partly analytically and partly numeri
cally (on finite systems)\, we recover both the in insulating phase and th
e superfluid phase as well as signatures of the critical point. We interpr
et these distinct signatures in terms of the distinct geometric features i
n the bulk.\n\nReference: P. Lunts\, S. Bhattacharjee\, J. Miller\, E. Sch
enetter\, Y. B. Kim and S.-S. Lee\, arXiv:1503.06474\; JHEP 107 (2015).\n\
nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4971
LOCATION:DTP Seminar Room A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4971
END:VEVENT
BEGIN:VEVENT
SUMMARY:Monopole Operators in 3d N=2 Chen-Simons matter theories (Quantum
Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20160421T060000Z
DTEND;VALUE=DATE-TIME:20160421T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4989@cern.ch
DESCRIPTION:We will discuss monopole operators in U(Nc) Chern-Simons-matte
r theories in three space-time dimensions. We mention an apparent problem
in the matching of such operators in dualities between non-supersymmetric
theories\, and suggest a possible reso- lution. A similar apparent problem
exists in the mapping of chiral monopole operators in theories with N = 2
supersymmetry. We show that in many theories the lowest naive chiral mono
pole operator is actually not chiral\, and we find the lowest monopole ope
rator that is actually chiral in these theories. It turns out that there a
re several different forms of this operator\, depending on the number of c
olors\, the number of flavours\, and the Chern-Simons level. Since we use
the supersymmetric index to find the lowest chiral monopoles\, our results
for these monopoles are guaranteed to be invariant under the dualities in
supersymmetric theories. The theories we discuss are believed to be dual
in the ’t Hooft large Nc limit to classical high-spin gravity theories.
We argue that these theories (supersymmetric or not) should not have class
ical solutions charged under the U(1) gauge field in the high-spin multipl
et.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4989
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4989
END:VEVENT
BEGIN:VEVENT
SUMMARY:Free-field realisations of the BMS3 algebra and its extensions
DTSTART;VALUE=DATE-TIME:20160422T060000Z
DTEND;VALUE=DATE-TIME:20160422T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-4990@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
4990
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=4990
END:VEVENT
BEGIN:VEVENT
SUMMARY:Three dimensional (super) Yang-Mills with compressible quark matte
r.(Quantum Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20160425T060000Z
DTEND;VALUE=DATE-TIME:20160425T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5000@cern.ch
DESCRIPTION:Finite density systems have rich\, varied\, and often poorly-u
nderstood phases. In this talk\, we will review some recent progress on th
e understanding of the nature of the ground state of a strongly coupled\,f
inite density system with fundamental matter field\, using the methods of
Gauge-Gravity duality. We will discuss the so-called Veneziano limit\, in
which both the number of colours and flavours are taken to be large\, and
discuss the dual solutions of supergravity withsources. To explicitly map
out the details\, we will focus on (2+1)-dimensions and discuss the corres
ponding physics.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py
?confId=5000
LOCATION:DTP Seminar Room A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5000
END:VEVENT
BEGIN:VEVENT
SUMMARY:Monopole Operators in 3d N=2 Chen-Simons matter theories- Part II
(Quantum Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20160427T060000Z
DTEND;VALUE=DATE-TIME:20160427T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5012@cern.ch
DESCRIPTION:We will discuss monopole operators in U(Nc) Chern-Simons-matte
r theories in three space-time dimensions. We mention an apparent problem
in the matching of such operators in dualities between non-supersymmetric
theories\, and suggest a possible reso- lution. A similar apparent problem
exists in the mapping of chiral monopole operators in theories with N = 2
supersymmetry. We show that in many theories the lowest naive chiral mono
pole operator is actually not chiral\, and we find the lowest monopole ope
rator that is actually chiral in these theories. It turns out that there a
re several different forms of this operator\, depending on the number of c
olors\, the number of flavours\, and the Chern-Simons level. Since we use
the supersymmetric index to find the lowest chiral monopoles\, our results
for these monopoles are guaranteed to be invariant under the dualities in
supersymmetric theories. The theories we discuss are believed to be dual
in the ’t Hooft large Nc limit to classical high-spin gravity theories.
We argue that these theories (supersymmetric or not) should not have class
ical solutions charged under the U(1) gauge field in the high-spin multipl
et.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5012
LOCATION:DTP Seminar Room A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5012
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higher Point Conformal Blocks and Entanglement Entropy in Heavy St
ates
DTSTART;VALUE=DATE-TIME:20160428T060000Z
DTEND;VALUE=DATE-TIME:20160428T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5013@cern.ch
DESCRIPTION:We consider conformal blocks of two heavy operators and an arb
itrary number\nof light operators in a (1+1)-d CFT with large central char
ge. Using the\nmonodromy method\, these higher-point conformal blocks are
shown to factorize\ninto products of 4-point conformal blocks in the heavy
-light limit for a\nclass of OPE channels. This result is reproduced by co
nsidering suitable\nworldline configurations in the bulk conical defect ge
ometry. We apply the\nCFT results to calculate the entanglement entropy of
an arbitrary number of\ndisjoint intervals for heavy states. The correspo
nding holographic\nentanglement entropy calculated via the minimal area pr
escription precisely\nmatches these results from CFT. Along the way\, we b
riefly illustrate the\nrelation of these conformal blocks to Riemann surfa
ces and their associated\nmoduli space.\n\nhttps://indico.tifr.res.in/indi
co/conferenceDisplay.py?confId=5013
LOCATION:DTP Seminar Room A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5013
END:VEVENT
BEGIN:VEVENT
SUMMARY:Solving theories with slightly broken higher spin symmetries
DTSTART;VALUE=DATE-TIME:20160623T053000Z
DTEND;VALUE=DATE-TIME:20160623T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5077@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
5077
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5077
END:VEVENT
BEGIN:VEVENT
SUMMARY:Solving theories with slightly broken higher spin symmetries (Part
2)
DTSTART;VALUE=DATE-TIME:20160624T053000Z
DTEND;VALUE=DATE-TIME:20160624T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5080@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
5080
LOCATION: AG80
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5080
END:VEVENT
BEGIN:VEVENT
SUMMARY:Solving theories with slightly broken higher spin symmetries (Part
3)
DTSTART;VALUE=DATE-TIME:20160629T060000Z
DTEND;VALUE=DATE-TIME:20160629T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5084@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
5084
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5084
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Duality Web in 2+1 Dimensions and Condensed Matter Physics (Bas
ed on: http://arxiv.org/abs/1606.01989)
DTSTART;VALUE=DATE-TIME:20160630T060000Z
DTEND;VALUE=DATE-TIME:20160630T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5085@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
5085
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5085
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Duality Web in 2+1 Dimensions and Condensed Matter Physics (Base
d on: http://arxiv.org/abs/1606.01989) (Part 2)
DTSTART;VALUE=DATE-TIME:20160722T043000Z
DTEND;VALUE=DATE-TIME:20160722T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5120@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
5120
LOCATION:DTP Seminar Room A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5120
END:VEVENT
BEGIN:VEVENT
SUMMARY:On Duality\, Solitons and Quenches in Generalized Calogero Models
in upto-Quartic Polynomial Potentials
DTSTART;VALUE=DATE-TIME:20160808T083000Z
DTEND;VALUE=DATE-TIME:20160808T093000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5139@cern.ch
DESCRIPTION:The family of Calogero models play a prominent role in Physics
and Mathematics.These models are known to be classically integrable for a
ny number of particles even in some external potentials. They can also be
remarkably formulated in terms of Matrices evolving in external potentials
which makes the underlying structure more transparent thereby addressing
questions on integrability. We show the existence of a dual model for the
system [1\,2].We write the duality relations explicitly between particles
and the dual variables. We show that the dual system can contain small num
ber of particles. We argue that such reductions play a role of soliton sol
utions of the model where the dual variables act like solitonic excitation
s [1\,2].After obtaining such solutions for finite number of Calogero part
icles\, we present the solutions in a collective field theory escription\,
where the model is described by hydrodynamic equations on continuous dens
ity and velocity fields. Soliton solutions in the hydrodynamic model are f
inite dimensional reductions of the integrable field theory and describe t
he evolution of density bumps and velocity in curved backgrounds. We will
also present some results on non-linear dynamics and quenches in these mod
els\n[3\,4].\n\n[1] M. Kulkarni\, A. Polychronakos (2016\, in preparation)
\n[2] A. G. Abanov\, A. Gromov\, M. Kulkarni\, J. Phys. A: Math. Theor. 44
\, 295203 (2011)\n[3] F. Franchini\, A. Gromov\, M. Kulkarni\, A. Trombet
toni\, J. Phys. A: Math. Theor. 48\, 28FT01 (2015)\n[4] F. Franchini\, M
. Kulkarni\, A. Trombettoni (arXiv:1603.03051)\n\nhttps://indico.tifr.res.
in/indico/conferenceDisplay.py?confId=5139
LOCATION:DTP Seminar Room A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5139
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holography\, Second Law and Higher Curvature Gravity
DTSTART;VALUE=DATE-TIME:20160808T060000Z
DTEND;VALUE=DATE-TIME:20160808T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5142@cern.ch
DESCRIPTION:Gravity being the manifestation of the curvature of spacetime
can create regions which are inaccessible to a class of observers. An exam
ple of such a region is the event horizon of black objects which acts as a
n one way causal boundary. Interestingly\, it is possible to assign thermo
dynamic properties like temperature\, entropy etc. to the event horizon. H
orizon thermodynamics is believed to be a crucial input to understand the
quantum dynamics of gravity. The basis of this thermodynamic analogy is th
e second law of black hole mechanics which asserts that the area of the ev
ent horizon can not decrease in any classical process.\n\nGeneral theory o
f relativity could be an effective theory and the classical action for gra
vity may also contain higher curvature terms. Then a natural question is w
hether the thermodynamic properties of space time horizons can be generali
zed beyond general relativity. This talk will focus on the ``second law" o
f black hole thermodynamics and discuss various possible generalizations t
o higher curvature gravity and how the second law connects black hole entr
opy with the notion of holographic entanglement entropy in AdS/CFT.\n\nhtt
ps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5142
LOCATION:DTP Seminar Room A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5142
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black hole thermodynamics from supersymmetric gauge theories
DTSTART;VALUE=DATE-TIME:20160811T043000Z
DTEND;VALUE=DATE-TIME:20160811T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5138@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
5138
LOCATION:DTP Seminar Room A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5138
END:VEVENT
BEGIN:VEVENT
SUMMARY:Classical internal structure of Black Holes (Quatntum Spacetime Se
minar Series)
DTSTART;VALUE=DATE-TIME:20160822T060000Z
DTEND;VALUE=DATE-TIME:20160822T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5157@cern.ch
DESCRIPTION:In this talk I will present some of my recent work on the inne
r horizon instability of charged AdS black holes. I will also discuss the
topic of "stable trapping of null geodesics" and its relevance in discussi
ons related to non-linear instability of asymptotically AdS solutions and
of microstate geometries.\n\nhttps://indico.tifr.res.in/indico/conferenceD
isplay.py?confId=5157
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5157
END:VEVENT
BEGIN:VEVENT
SUMMARY:Big crunch singularities in AdS and relevant deformations of CFT's
DTSTART;VALUE=DATE-TIME:20160824T060000Z
DTEND;VALUE=DATE-TIME:20160824T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5166@cern.ch
DESCRIPTION:The AdS gravity dual of a CFT on de Sitter spacetime with a re
levant deformation (mass term) contains a cosmological curvature singulari
ty (big crunch). The field theory can equivalently be viewed as a CFT on
the Einstein static universe deformed by a time-dependent mass diverging a
t finite time. If we can understand the signature(s) of the crunch in the
QFT\, we may eventually be able to understand the resolution of the crunc
h in the bulk by stringy or quantum effects via the holographic dictionary
. In this talk I will give an introduction to this topic and describe som
e recent work.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?c
onfId=5166
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5166
END:VEVENT
BEGIN:VEVENT
SUMMARY:Asymptotic Symmetries of gravity and soft theorems (Quantum Spacet
ime Seminar)
DTSTART;VALUE=DATE-TIME:20160829T100000Z
DTEND;VALUE=DATE-TIME:20160829T110000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5170@cern.ch
DESCRIPTION:In 2013\, Strominger gave a Proposal for the symmetry group of
Quantum Gravity S-matrix\, which was derived from the well known BMS (Bon
di- Matzner-Sachs) group of classical General Relativity. This work led to
a beautiful equivalence between Weinberg's soft graviton theorem in (pert
urbative) quantum gravity and Ward identities associated to so- called Sup
er- translation symmetries.\n\nIn this talk \, I will review this and othe
r recent developments which point towards understanding the symmetries of
perturbative quantum gravity by analysing various soft theorems.\n\nThis t
alk is based on recent joint work with Miguel Campiglia.\n\nhttps://indico
.tifr.res.in/indico/conferenceDisplay.py?confId=5170
LOCATION:DTP Seminar Room A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5170
END:VEVENT
BEGIN:VEVENT
SUMMARY:A new nonperturbative framework for large N QCD
DTSTART;VALUE=DATE-TIME:20160908T053000Z
DTEND;VALUE=DATE-TIME:20160908T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5186@cern.ch
DESCRIPTION:We will discuss a new approach towards constructing a nonpertu
rbative effective framework for large N QCD that can combine weakly couple
d and strongly coupled degrees of freedom over a very wide range of energy
scales and which has the marginal perturbative couplings only as the effe
ctive parameters. This approach combines perturbative QCD with holographic
duality using renormalization group techniques as a tool – the dual gra
vity for the infrared and the interactions between soft and hard degrees o
f freedom should be derived from first principles. Although the constructi
on is not\ncomplete\, we will discuss important advances and outline the c
oncrete steps for realizing it fully in the near future. We will discuss a
model for QGP formation and thermalization which brings in novel dynamica
l complexities that are not present in other approaches. We will also disc
uss a toy model in which we will realize all principles needed for the ful
l nonperturbative field theory construction in the large N limit.\n\nhttps
://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5186
LOCATION:School of Mathematics Seminar Room A 369
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5186
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spectral sums rules for conformal field theories in arbitrary dime
nsions (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20160919T060000Z
DTEND;VALUE=DATE-TIME:20160919T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5193@cern.ch
DESCRIPTION:We derive spectral sum rules in the shear channel for conforma
l field theories in general d > 3 dimensions. The sum rules result from th
e OPE of the stress tensor at high frequency as well as the hydrodynamic b
ehaviour of the theory at low frequencies. The sum rule states that a weig
hted integral of the spectral density over frequencies is proportional to
the energy density of the theory. We show that the proportionality constan
t can be written in terms of the data which determines the three point fun
ction of the stress tensors of the CFT. For theories which admit a two der
ivative gravity dual this proportionality constant is given by d/(2 (d+1)
). We then use causality constraints and obtain bounds on the sum rule whi
ch are valid for any conformal field theory. Finally we demonstrate that t
he high frequency behaviour of the spectral function in the vector and the
tensor channel are related to the Maldacena-Hofman coefficients.\n\nhttps
://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5193
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5193
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chaos bound in general holographic space time
DTSTART;VALUE=DATE-TIME:20160922T060000Z
DTEND;VALUE=DATE-TIME:20160922T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5212@cern.ch
DESCRIPTION:We use of holography to investigate the scrambling properties
of various physical systems. Specifically\, we consider: (i) non-conformal
backgrounds of black Dp branes\, (ii) asymptotically Lifshitz black holes
\, and (iii) black AdS solutions of Gauss-Bonnet gravity. We use the disru
ption of the entanglement entropy as a probe of the chaotic features of su
ch systems. Our analysis shows that these theories share the same type of
behavior as conformal theories as they undergo chaos\, however\, in the ca
se of Gauss-Bonnet gravity\, we find a stark difference in the evolution o
f the mutual information for negative Gauss-Bonnet coupling. This may sign
al an inconsistency of the latter.\n\nhttps://indico.tifr.res.in/indico/co
nferenceDisplay.py?confId=5212
LOCATION: A269
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5212
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entanglement in ghost systems (Quantum Sapcetime Seminar series)
DTSTART;VALUE=DATE-TIME:20160926T060000Z
DTEND;VALUE=DATE-TIME:20160926T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5214@cern.ch
DESCRIPTION:Certain generalizations of the Ryu-Takayanagi formulation of h
olographic entanglement entropy lead to certain complex extremal surfaces
in de Sitter space\, assuming dS/CFT formulated using the wavefunction of
the universe equated with the CFT partition function. The areas are negati
ve in dS4 (where the dual CFT central charge is real and negative). Toward
s exploring this further\, we study the replica formulation of entanglemen
t entropy in some toy 2-dim ghost CFTs and argue that negative entanglemen
t entropy arises given certain conditions. We also study a simple toy mode
l of two "ghost-spins"\, where a single ghost-spin is defined as a 2-state
spin variable with indefinite norm. This corroborates some of the above.
We develop this further by studying systems of entangled spins and ghost-s
pins regarded as toy models for theories with negative norm states. Analys
ing the von Neumann entropy of the reduced density matrix by tracing over
the ghost-spins gives sensible interpretations for even numbers of ghost-s
pins and more generally reveals new entanglement patterns.\n\nhttps://indi
co.tifr.res.in/indico/conferenceDisplay.py?confId=5214
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5214
END:VEVENT
BEGIN:VEVENT
SUMMARY:Conformal Bootstrap in Mellin Space (Quantum Spacetime Seminar ser
ies)
DTSTART;VALUE=DATE-TIME:20161003T060000Z
DTEND;VALUE=DATE-TIME:20161003T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5222@cern.ch
DESCRIPTION:We describe a new approach towards analytically solving for th
e dynamical content of Conformal Field Theories (CFTs) using the bootstrap
philosophy. This combines the original bootstrap idea of Polyakov with th
e modern technology of the Mellin representation of CFT amplitudes. We ill
ustrate the power of this method in the epsilon expansion of the Wilson-Fi
sher fixed point by reproducing anomalous dimensions and obtaining OPE coe
fficients to higher orders in epsilon than currently available using other
analytic techniques (including Feynman diagram calculations).\n\nOur resu
lts enable us to get a somewhat better agreement of certain observables in
the 3d Ising model\, with the precise numerical values that have been rec
ently obtained.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?
confId=5222
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5222
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rebooting the Conformal Bootstrap in Mellin Space (Quantum Spaceti
me Seminar series)
DTSTART;VALUE=DATE-TIME:20161017T060000Z
DTEND;VALUE=DATE-TIME:20161017T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5250@cern.ch
DESCRIPTION:In one of his pioneering works\, Polyakov had used conformal s
ymmetries to introduce "unitary amplitudes" that described a 4-point funct
ion. Demanding consistency of the unitary amplitude description with the O
PE of a correlator\, he could obtain nontrivial data of the operator spect
rum. In the modern language\, Polyakov's unitary amplitudes seem to emerge
from\nthe Mellin space formalism of conformal field theories. A manifestl
y crossing symmetric Mellin transform of a CFT correlator can give rise to
spurious terms\, not present in the OPE. Demanding the cancellation of th
e spurious terms lead to nontrivial information of the operators of the CF
T. I will show how to use this approach to calculate anomalous dimensions
and OPE coefficients for the Wilson Fisher point\, O(N) critical theory a
nd large spin asymptotics.\n\nhttps://indico.tifr.res.in/indico/conference
Display.py?confId=5250
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5250
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic description of non-BPS orbifolded D1-D5-P solutions (
Quantum Spacetime Seminar series)
DTSTART;VALUE=DATE-TIME:20161024T060000Z
DTEND;VALUE=DATE-TIME:20161024T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5255@cern.ch
DESCRIPTION:Extremal Black hole microstate geometries have been well studi
ed in the context of the black hole information puzzle and fuzzball propos
al. Non-extremal black hole microstates are much more interesting but less
explored. Using the AdS/CFT prescription\, we identify a general class of
dual states of non-supersymmetric orbifolded D1-D5-P supergravity solutio
ns (JMaRT). The dual CFT states can be obtained by fractional spectral flo
w both in the left and right sectors. In the gravity side\, these states c
orrespond to the degrees of freedom living in the cap region of the geomet
ry. We compute the massless scalar emission spectrum and emission rates bo
th in the gravity and CFT sides and show that they match perfectly\, thus
providing strong evidence for our identification. We also investigate the
physics of ergo-region emission as a pair creation for these orbifolded s
olutions. Our results represent the largest class of non-supersymmetric bl
ack hole microstate geometries with identified CFT duals presently known.\
n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5255
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5255
END:VEVENT
BEGIN:VEVENT
SUMMARY:Breakdown of String Perturbation Theory for a Large Number of Part
icles
DTSTART;VALUE=DATE-TIME:20161031T043000Z
DTEND;VALUE=DATE-TIME:20161031T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5271@cern.ch
DESCRIPTION:We provide analytical and numerical evidence for the breakdown
of string perturbation theory when the number of particles in a scatterin
g amplitude becomes large\, even as the energy per particle stays small. W
e describe some implications for the information paradox.\n\nhttps://indic
o.tifr.res.in/indico/conferenceDisplay.py?confId=5271
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5271
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensionless strings and related fun things. (Quantum Spacetime Sem
inar series)
DTSTART;VALUE=DATE-TIME:20161031T060000Z
DTEND;VALUE=DATE-TIME:20161031T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5272@cern.ch
DESCRIPTION:I will talk about the formulation of the tensionless limit of
closed bosonic and superstring theory from the point of view of worldsheet
symmetries. In the tensionless limit of closed bosonic string theory\, Ga
lilean conformal symmetry arises as the residual gauge symmetry on the ten
sionless worldsheet. The analysis of the fundamentally tensionless theory
is related to the tensionless limit that is viewed as a contraction of wor
ldsheet coordinates. Analysis of the quantum regime uncovers interesting p
hysics. The degrees of freedom that appear in the tensionless string are f
undamentally different from the usual string states. Through a Bogoliubov
transformation on the worldsheet\, we link the tensionless vacuum to the u
sual tensile vacuum. As an application\, we show that our analysis can be
used to understand physics of strings at very high temperatures. I also sp
eak about our more recent extension of this analysis to closed superstring
s.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5272
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5272
END:VEVENT
BEGIN:VEVENT
SUMMARY:Symmetry Constraints in Inflation (Quantum Spacetime Seminar serie
s)
DTSTART;VALUE=DATE-TIME:20161107T060000Z
DTEND;VALUE=DATE-TIME:20161107T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5282@cern.ch
DESCRIPTION:Cosmological inflation gives rise to the homogeneous and isotr
opic universe we observe today\, as well as generates quantum perturbation
s which lead to CMB anisotropies and the formation of large scale structur
e. The geometry of the universe during inflation is approximately de Sitte
r space. We will discuss the interesting constraints imposed on the correl
ation functions of inflationary perturbations by the underlying spatial re
parametrization invariance of the theory in single field models of inflati
on. The constraints are in the form of Ward identities for scaling and spe
cial conformal transformations\, which are isometries of de Sitter space.
We will discuss the implications of these constraints for the scalar three
point function. We will also study the constraints when the possibility f
or the universe to have started from a non Bunch-Davies vacuum state\, in
particular the de Sitter invariant alpha-vacua states\, is considered.\n\n
https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5282
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5282
END:VEVENT
BEGIN:VEVENT
SUMMARY:S-matrix constraints on perturbative UV completions (Quantum Space
time Seminar series)
DTSTART;VALUE=DATE-TIME:20161123T090000Z
DTEND;VALUE=DATE-TIME:20161123T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5302@cern.ch
DESCRIPTION:I will discuss the general framework in which one can discuss
the issue of perturbative UV completions of gravity theories\, in the cont
ext of four-point graviton scattering. Simple proofs lead to the need for
infinite tower of massive higher spin particles. We will turn to the scatt
ering of the scalar part of the spectrum. Using the duality between flat s
pace S-matrix and Mellin amplitudes of four-point correlations in conforma
l field theories\, we will show that the Regge trajectory\, which encodes
the spectrum of the theory\, must be linear in certain kinematic regimes\
, just like string theory.\n\nhttps://indico.tifr.res.in/indico/conference
Display.py?confId=5302
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5302
END:VEVENT
BEGIN:VEVENT
SUMMARY:(1+1)d generalization of SYK model (Quantum Spacetime Seminar seri
es)
DTSTART;VALUE=DATE-TIME:20161128T060000Z
DTEND;VALUE=DATE-TIME:20161128T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5305@cern.ch
DESCRIPTION:The Sachdev-Ye-Kitaev (SYK) model\, is a quantum mechanical mo
del involving N Majorana fermions with random interactions. It is a solvab
le model at large N which also saturates the chaos bound. In this talk\, I
will describe a 1+1d generalization of SYK model which retains the solvab
le aspects of the original model. The model contains N fermions at each la
ttice site\, with a nearest neighbour hopping term along with random inter
actions\, and gives rise to a rich variety of IR behaviours.\n\nhttps://in
dico.tifr.res.in/indico/conferenceDisplay.py?confId=5305
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5305
END:VEVENT
BEGIN:VEVENT
SUMMARY:An algebraic look at quantum theory (Quantum Spacetime Seminar se
ries)
DTSTART;VALUE=DATE-TIME:20161226T060000Z
DTEND;VALUE=DATE-TIME:20161226T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5363@cern.ch
DESCRIPTION:An operator-oriented approach to quantum theories has recently
been used to understand the definition of entanglement in gauge theories.
The applicability of this approach extends far beyond this one problem\,
and in this talk I will discuss how one can understand dualities and coars
e-graining in terms of operator algebras. This sheds light on two very con
crete questions: how does entanglement entropy map under field-theoretic d
ualities\, and how does one coarse-grain a quantum theory whose Hilbert sp
ace does not factorize? I will answer these questions\, and as an applicat
ion (time permitting) I will discuss how coarse-graining quantum mechanica
l theories provides a unified perspective on quantum chaos.\n\nhttps://ind
ico.tifr.res.in/indico/conferenceDisplay.py?confId=5363
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5363
END:VEVENT
BEGIN:VEVENT
SUMMARY:6d Dual Conformal Symmetry and Minimal Volumes in AdS
DTSTART;VALUE=DATE-TIME:20161226T103000Z
DTEND;VALUE=DATE-TIME:20161226T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5364@cern.ch
DESCRIPTION:The S-matrix of a theory often exhibits symmetries which are n
ot manifest from the viewpoint of its Lagrangian. For instance\, powerful
constraints on scattering amplitudes are imposed by the dual conformal sym
metry of planar 4d N=4 super Yang-Mills theory and the ABJM theory. Motiva
ted by this\, we investigate the consequences of dual conformal symmetry i
n six dimensions\, which may provide useful insight into the worldvolume t
heory of M5-branes (if it enjoys such a symmetry). On the other hand\, we
are able to generalize the Alday-Maldacena solution for a minimal area str
ing in Anti-de Sitter space to a minimal volume M2-brane ending on a pillo
w-shaped surface in the boundary\, whose seams correspond to a null-polygo
n. Comparing these two results\, we shall speculate about the possible imp
lications of our result\, for the theory on M5-branes.\n\nhttps://indico.t
ifr.res.in/indico/conferenceDisplay.py?confId=5364
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5364
END:VEVENT
BEGIN:VEVENT
SUMMARY:A London Equation for Axion Monodromy
DTSTART;VALUE=DATE-TIME:20161230T060000Z
DTEND;VALUE=DATE-TIME:20161230T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5373@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
5373
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5373
END:VEVENT
BEGIN:VEVENT
SUMMARY:Branes and the Kraft - Procesi transition (Quantum Spacetime Semi
nar series)
DTSTART;VALUE=DATE-TIME:20170102T060000Z
DTEND;VALUE=DATE-TIME:20170102T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5379@cern.ch
DESCRIPTION:I will discuss general aspects of Hyper-Kahler cones that appe
ar as moduli spaces of theories with 8 supercharges. These show up in gaug
e theories as well as in brane systems\, or in any string theory backgroun
d with 8 supercharges.\n\nWe will look at Higgs branches\, coulomb branche
s\, brane systems\, and possibly discuss the physics of nilpotent orbits.\
n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5379
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5379
END:VEVENT
BEGIN:VEVENT
SUMMARY:Weyl Anomalies and Cosmology (Quantum Spacetime Seminar series)
DTSTART;VALUE=DATE-TIME:20170105T061500Z
DTEND;VALUE=DATE-TIME:20170105T071500Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5387@cern.ch
DESCRIPTION:I'll discuss effects of Weyl anomalies arising from renormali
zation of composite operators in a cosmological context. I’ll first des
cribe a two-dimensional model of gravity in which the nonlocal contribut
ions to the quantum effective action arising from such Weyl anomalies slo
w down exponential de Sitter expansion to quasi de Sitter power law expans
ion and lead to a slow dilution of vacuum energy. I’ll describe metho
ds to systematically compute similar nonlocal effects for general actions
in four dimensions for cosmological spacetimes using local renormalization
group and compare them with the Barvinsky-Vilkovisky expansion. I’ll co
nclude by discussing possible implications for primordial magnetogenesis a
nd quantum stability of (anti) de Sitter spacetimes.\n\nhttps://indico.tif
r.res.in/indico/conferenceDisplay.py?confId=5387
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5387
END:VEVENT
BEGIN:VEVENT
SUMMARY:A new perspective on holographic entanglement (Quantum Spacetime S
eminar Series)
DTSTART;VALUE=DATE-TIME:20170109T060000Z
DTEND;VALUE=DATE-TIME:20170109T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5396@cern.ch
DESCRIPTION:The by-now classic Ryu-Takayanagi formula associates the entan
glement entropy of a spatial region in a holographic field theory with the
area of a certain minimal surface in the bulk. Despite its simplicity and
beauty\, this formula raises a number of stubborn conceptual problems. I
will present a reformulation which does not involve the areas of surfaces.
This reformulation leads to a picture of entanglement in the field theory
being carried by Planckthickness "bit threads" in the bulk. I will argue
that this\npicture helps to resolve a number of the conceptual difficultie
s surrounding the RT formula.\n\nhttps://indico.tifr.res.in/indico/confere
nceDisplay.py?confId=5396
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5396
END:VEVENT
BEGIN:VEVENT
SUMMARY:Distinguished Tata-Infosys Lectures series - Asymptotic Symmetries
and Soft Theorems: From QED to Black Holes (Lecture 1)
DTSTART;VALUE=DATE-TIME:20170116T060000Z
DTEND;VALUE=DATE-TIME:20170116T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5400@cern.ch
DESCRIPTION:A pedagogical introduction will be given to highlights of the
recently-discovered infinity of conservation laws which control the infrar
ed dynamics of all four- dimensional gauge and gravitational theories.\n\
nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5400
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5400
END:VEVENT
BEGIN:VEVENT
SUMMARY:Distinguished Tata-Infosys Lectures series - Asymptotic Symmetries
and Soft Theorems: From QED to Black Holes (Lecture 2)
DTSTART;VALUE=DATE-TIME:20170117T063000Z
DTEND;VALUE=DATE-TIME:20170117T073000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5401@cern.ch
DESCRIPTION:A pedagogical introduction will be given to highlights of the
recently-discovered infinity of conservation laws which control the infrar
ed dynamics of all four- dimensional gauge and gravitational theories.\n\
nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5401
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5401
END:VEVENT
BEGIN:VEVENT
SUMMARY:Physical string realization of Walcher's topological string
DTSTART;VALUE=DATE-TIME:20170117T090000Z
DTEND;VALUE=DATE-TIME:20170117T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5422@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
5422
LOCATION: A269
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5422
END:VEVENT
BEGIN:VEVENT
SUMMARY:Distinguished Tata-Infosys Lectures series - Asymptotic Symmetries
and Soft Theorems: From QED to Black Holes (Lecture 3)
DTSTART;VALUE=DATE-TIME:20170118T043000Z
DTEND;VALUE=DATE-TIME:20170118T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5402@cern.ch
DESCRIPTION:A pedagogical introduction will be given to highlights of the
recently-discovered infinity of conservation laws which control the infrar
ed dynamics of all four- dimensional gauge and gravitational theories.\n\
nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5402
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5402
END:VEVENT
BEGIN:VEVENT
SUMMARY:Low momentum expansion of one loop string amplitudes (Quantum Spac
etime Seminar)
DTSTART;VALUE=DATE-TIME:20170130T060000Z
DTEND;VALUE=DATE-TIME:20170130T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5450@cern.ch
DESCRIPTION:I shall discuss the low momentum expansion of the four gravito
n amplitude in maximally supersymmetric string theory\, which leads to loc
al terms in the effective action. This is obtained by integrating certain
modular graph functions over the fundamental domain of SL(2\,Z). I shall
also discuss new issues that arise for the five graviton amplitude.\n\nhtt
ps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5450
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5450
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hyperscaling violation and the shear diffusion constant
DTSTART;VALUE=DATE-TIME:20170131T060000Z
DTEND;VALUE=DATE-TIME:20170131T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5456@cern.ch
DESCRIPTION:Motivated by the analysis of Kovtun\, Son and Starinets\, we s
tudy the diffusion constant for theories with Lifshitz and hyperscaling vi
olating exponents z and Θ. We study shear gravitational perturbations in
the near-horizon region imposing certain self-consistent approximations on
a suitably defined stretched horizon. This is effectively done by compact
ifying the hyperscaling violating Lifshitz theory along a spatial directio
n thus mapping shear gravitational perturbations to gauge field perturbati
ons in the compactified theory. Through appropriately defined currents on
the stretched horizon\, we set up a diffusion equation and hence calculate
the shear diffusion constant for these hyperscaling violating theories. I
t is observed for a certain class of hyperscaling violating theories i.e w
hen z<4-Θ\, we see the diffusion constant scales as a power law with resp
ect to temperature suggesting universal behaviour in relation to the visco
sity bound. When z≥4-Θ\, diffusion constant scales logarithmically with
temperature\, suggesting a breakdown of our analysis in the near horizon
regime.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5
456
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5456
END:VEVENT
BEGIN:VEVENT
SUMMARY: Emergence of Bulk Physics in AdS/CFT (Tata Infosys lectures Seri
es) [Lecture 1]
DTSTART;VALUE=DATE-TIME:20170201T060000Z
DTEND;VALUE=DATE-TIME:20170201T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5466@cern.ch
DESCRIPTION:In this lecture series\, I will review a series of recent deve
lopments which relate the AdS/CFT correspondence to the theory of quantum
error correcting codes. We will see that many surprising features of the
correspondence\, including locality in the radial direction\, subregion du
ality\, and the Ryu Takayanagi formula arise quite naturally in the theory
of quantum error correcting codes\, which thus give a new\, non-perturbat
ive picture of the duality.\n\nhttps://indico.tifr.res.in/indico/conferenc
eDisplay.py?confId=5466
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5466
END:VEVENT
BEGIN:VEVENT
SUMMARY: Emergence of Bulk Physics in AdS/CFT (Tata Infosys lectures Seri
es) [Lecture 2]
DTSTART;VALUE=DATE-TIME:20170203T060000Z
DTEND;VALUE=DATE-TIME:20170203T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5472@cern.ch
DESCRIPTION:In this lecture series\, I will review a series of recent deve
lopments which relate the AdS/CFT correspondence to the theory of quantum
error correcting codes. We will see that many surprising features of the
correspondence\, including locality in the radial direction\, subregion du
ality\, and the Ryu Takayanagi formula arise quite naturally in the theory
of quantum error correcting codes\, which thus give a new\, non-perturbat
ive picture of the duality.\n\nhttps://indico.tifr.res.in/indico/conferenc
eDisplay.py?confId=5472
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5472
END:VEVENT
BEGIN:VEVENT
SUMMARY: Emergence of Bulk Physics in AdS/CFT (Tata Infosys lectures Seri
es) [Lecture 3]
DTSTART;VALUE=DATE-TIME:20170206T060000Z
DTEND;VALUE=DATE-TIME:20170206T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5473@cern.ch
DESCRIPTION:In this lecture series\, I will review a series of recent deve
lopments which relate the AdS/CFT correspondence to the theory of quantum
error correcting codes. We will see that many surprising features of the
correspondence\, including locality in the radial direction\, subregion du
ality\, and the Ryu Takayanagi formula arise quite naturally in the theory
of quantum error correcting codes\, which thus give a new\, non-perturbat
ive picture of the duality.\n\nhttps://indico.tifr.res.in/indico/conferenc
eDisplay.py?confId=5473
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5473
END:VEVENT
BEGIN:VEVENT
SUMMARY: Emergence of Bulk Physics in AdS/CFT (Tata Infosys lectures Seri
es) [Lecture 4]
DTSTART;VALUE=DATE-TIME:20170207T050000Z
DTEND;VALUE=DATE-TIME:20170207T060000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5474@cern.ch
DESCRIPTION:In this lecture series\, I will review a series of recent deve
lopments which relate the AdS/CFT correspondence to the theory of quantum
error correcting codes. We will see that many surprising features of the
correspondence\, including locality in the radial direction\, subregion du
ality\, and the Ryu Takayanagi formula arise quite naturally in the theory
of quantum error correcting codes\, which thus give a new\, non-perturbat
ive picture of the duality.\n\nhttps://indico.tifr.res.in/indico/conferenc
eDisplay.py?confId=5474
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5474
END:VEVENT
BEGIN:VEVENT
SUMMARY:Transport in Chern-Simons-Matter Theories (Quantum Spacetime Semin
ar)
DTSTART;VALUE=DATE-TIME:20170213T060000Z
DTEND;VALUE=DATE-TIME:20170213T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5490@cern.ch
DESCRIPTION:The frequency-dependent longitudinal and Hall conductivities -
-- σxx and σxy --- are dimensionless functions of ω/T in 2+1 dimensiona
l CFTs at nonzero temperature. These functions characterize the spectrum o
f charged excitations of the theory and are basic experimental observables
. We compute these conductivities for large N Chern-Simons theory with fer
mion matter. The computation is exact in the 't Hooft coupling λ at N=∞
. We describe various physical features of the conductivity\, including an
explicit relation between the weight of the delta function at ω=0 in σx
x and the existence of infinitely many higher spin conserved currents in t
he theory. We also compute the conductivities perturbatively in Chern-Simo
ns theory with scalar matter and show that the resulting functions of ω/T
agree with the strong coupling fermionic result. This provides a new test
of the conjectured 3d bosonization duality. In matching the Hall conducti
vities we resolve an outstanding puzzle by carefully treating an extra ano
maly that arises in the regularization scheme used.\n\nhttps://indico.tifr
.res.in/indico/conferenceDisplay.py?confId=5490
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5490
END:VEVENT
BEGIN:VEVENT
SUMMARY:Horizon Thermodynamics and Local Energy Conditions(Tata Infosys le
ctures Series) (Lecture 1)
DTSTART;VALUE=DATE-TIME:20170220T093000Z
DTEND;VALUE=DATE-TIME:20170220T103000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5515@cern.ch
DESCRIPTION:Black holes\, and other causal horizons e.g. de Sitter horizon
s in cosmology\, obey laws of thermodynamics reminiscent of ordinary therm
al systems. I will explain the definition and proof of the Generalized Sec
ond Law for causal horizons\, and discuss its relationship to lower bounds
on the stress-energy\ntensor in classical and quantum field theories.\n\n
Lecture 1: Why do black holes obey a second law?\n\nhttps://indico.tifr.re
s.in/indico/conferenceDisplay.py?confId=5515
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5515
END:VEVENT
BEGIN:VEVENT
SUMMARY:Horizon Thermodynamics and Local Energy Conditions(Tata Infosys le
ctures Series) (Lecture 2)
DTSTART;VALUE=DATE-TIME:20170223T060000Z
DTEND;VALUE=DATE-TIME:20170223T103000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5516@cern.ch
DESCRIPTION:Black holes\, and other causal horizons e.g. de Sitter horizon
s in cosmology\, obey laws of thermodynamics reminiscent of ordinary therm
al systems. I will explain the definition and proof of the Generalized Sec
ond Law for causal horizons\, and discuss its relationship to lower bounds
on the stress-energy\ntensor in classical and quantum field theories.\n\n
Lecture 2: What prevents negative energy from violating causality?\n\nhttp
s://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5516
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5516
END:VEVENT
BEGIN:VEVENT
SUMMARY:Horizon Thermodynamics and Local Energy Conditions(Tata Infosys le
ctures Series) (Lecture 3)
DTSTART;VALUE=DATE-TIME:20170224T043000Z
DTEND;VALUE=DATE-TIME:20170224T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5517@cern.ch
DESCRIPTION:Black holes\, and other causal horizons e.g. de Sitter horizon
s in cosmology\, obey laws of thermodynamics reminiscent of ordinary therm
al systems. I will explain the definition and proof of the Generalized Sec
ond Law for causal horizons\, and discuss its relationship to lower bounds
on the stress-energy tensor in classical and quantum field theories.\n\nL
ecture 3: How to make a Traversable Wormhole.\n\nhttps://indico.tifr.res.i
n/indico/conferenceDisplay.py?confId=5517
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5517
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase diagram of the GWW phase transition of the matrix quantum me
chanics with a chemical potential
DTSTART;VALUE=DATE-TIME:20170303T060000Z
DTEND;VALUE=DATE-TIME:20170303T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5553@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
5553
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5553
END:VEVENT
BEGIN:VEVENT
SUMMARY:Melting of three-sublattice order: How does a KT phase pinch off?
(Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20170306T060000Z
DTEND;VALUE=DATE-TIME:20170306T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5552@cern.ch
DESCRIPTION:On lattices with triangular symmetry\, competition between dif
ferent antiferromagnetic interactions results in a macroscopic degeneracy
of low energy configurations for easy-axis magnets. Small perturbations or
quantum fluctuations then seed a three-sublattice ordered state which bre
aks lattice and spin symmetries. The question in the title has to do with
the temperature-driven transition from this long-range ordered state to a
high temperature paramagnet: In addition to a direct first order transitio
n\, which is certainly possible\, two other scenarios are possible on gene
ral (symmetry) grounds: a two-step melting process\, with an intermediate
Kosterlitz-Thouless (KT) phase\, or a sequence of two second- order transi
tions. After introducing this physics\, I will try and outline a couple of
questions (and some partial answers) about the multicritical point(s?) at
which the intermediate KT phase pinches-off to give way to either a first
- order transition line or two second-order transition lines.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=5552
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5552
END:VEVENT
BEGIN:VEVENT
SUMMARY:Melting of three-sublattice order: How does a KT phase pinch off?
[Part 2] (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20170307T060000Z
DTEND;VALUE=DATE-TIME:20170307T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5555@cern.ch
DESCRIPTION:On lattices with triangular symmetry\, competition between dif
ferent antiferromagnetic interactions results in a macroscopic degeneracy
of low energy configurations for easy-axis magnets. Small perturbations or
quantum fluctuations then seed a three-sublattice ordered state which bre
aks lattice and spin symmetries. The question in the title has to do with
the temperature-driven transition from this long-range ordered state to a
high temperature paramagnet: In addition to a direct first order transitio
n\, which is certainly possible\, two other scenarios are possible on gene
ral (symmetry) grounds: a two-step melting process\, with an intermediate
Kosterlitz-Thouless (KT) phase\, or a sequence of two second- order transi
tions. After introducing this physics\, I will try and outline a couple of
questions (and some partial answers) about the multicritical point(s?) at
which the intermediate KT phase pinches-off to give way to either a first
- order transition line or two second-order transition lines.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=5555
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5555
END:VEVENT
BEGIN:VEVENT
SUMMARY:Why CFT correlators can't probe sub-Ads Locality (Quantum Spacetim
e Seminar Series)
DTSTART;VALUE=DATE-TIME:20170314T060000Z
DTEND;VALUE=DATE-TIME:20170314T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5563@cern.ch
DESCRIPTION:I'll give two arguments that the full non-perturbative S matri
x of Minkowski space-time cannot be recovered as a limit of CFT correlator
s. The first is related to the interesting fact that the S-matrix is not
unitary in Fock space (a fact long known in 4 dimensions\, where it has no
finite Fock space matrix elements\, but true in arbitrary dimensions). P
rocesses involving "an infinite number of infinitely soft gravitons" canno
t be recovered in any straightforward way from CFT correlators. The seco
nd argument has to do with the difference between the fast scrambling beha
vior of flat space black holes and the ballistic Lieb Robinson bound on th
e scrambling of information in any cutoff quantum field theory. I'll show
how the formalism of Holographic Space-time (HST) can incorporate both th
ese behaviors in terms of a rapid crossover in the time dependent Hamilton
ian of HST at proper times of order the AdS radius. If there's time\, I'l
l also explain how HST explains the fact that "large radius" AdS spaces al
ways come equipped with an equally large compact space of at least two dim
ensions.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
5563
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5563
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emergent phase space description of unitary matrix model (Quantum
Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20170320T060000Z
DTEND;VALUE=DATE-TIME:20170320T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5570@cern.ch
DESCRIPTION:In this talk we shall first discuss a phase space description
of a generic unitary matrix model and see how different phases of the theo
ry can be characterised in terms of different topologies of two dimensiona
l droplets in phase space. Finally\, we write CS theory on S^3 in terms of
a unitary matrix model and provide a phase space description of the same.
The phase space description of gauge theories can be used to provide a du
al quantum mechanical description of string degrees of freedom\, since dif
ferent large N phases of gauge theory are dual to classical solutions of s
tring theory in AdS space.\n\nhttps://indico.tifr.res.in/indico/conference
Display.py?confId=5570
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5570
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entanglement\, Replicas and Thetas (Quantum Spacetime Seminar Seri
es)
DTSTART;VALUE=DATE-TIME:20170327T060000Z
DTEND;VALUE=DATE-TIME:20170327T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5582@cern.ch
DESCRIPTION:In the calculation of Renyi entropy for 2d CFT at finite size
and finite temperature\, one encounters a partition function on a higher-g
enus Riemann surface that is a branched cover of the torus. For free field
theories there are two ways to compute this\, one directly in higher-genu
s and the other using twist fields on the torus. This leads to some novel
identities between genus-n and genus-1 theta functions. I will present pre
liminary evidence that these identities are true in an expansion in interv
al size\, but not true as exact identities. Some consequences will be disc
ussed.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=55
82
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5582
END:VEVENT
BEGIN:VEVENT
SUMMARY:Soft graviton theorem (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20170403T060000Z
DTEND;VALUE=DATE-TIME:20170403T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5589@cern.ch
DESCRIPTION:I shall discuss the proof of subleading soft graviton theorem
in generic theories in general dimensions.\n\nhttps://indico.tifr.res.in/i
ndico/conferenceDisplay.py?confId=5589
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5589
END:VEVENT
BEGIN:VEVENT
SUMMARY:Advances in N=4 conformal supergravity (Quantum Spacetime Seminar
Series)
DTSTART;VALUE=DATE-TIME:20170410T060000Z
DTEND;VALUE=DATE-TIME:20170410T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5609@cern.ch
DESCRIPTION:N=4 conformal supergravity is both interesting and notoriously
difficult. The usual techniques of N=2 superconformal multiplet calculus
fails to be trivially extended for the N=4 case. And that is the reason wh
y an invariant action for N=4 conformal supergravity was lacking despite t
he Weyl multiplet being known almost 3 decades back. In one of the previou
s work\, notwithstanding the lack of techniques\, we developed a direct me
thod of constructing the invariant action. In this talk we will discuss ho
w we can obtain a more general class of action by developing an invariant
N=4 density formula that is a generalization of the N=2 chiral density for
mula. This opens up the possibility of studying the supergravity aspects o
f N=4 black holes in a complete N=4 setting which was so far being studied
in a truncated N=2 setting.\n\nhttps://indico.tifr.res.in/indico/conferen
ceDisplay.py?confId=5609
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5609
END:VEVENT
BEGIN:VEVENT
SUMMARY:’t Hooft Anomalies for Discrete Symmetries (Quantum Spacetime Se
minar Series) (Part 1)
DTSTART;VALUE=DATE-TIME:20170417T060000Z
DTEND;VALUE=DATE-TIME:20170417T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5629@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
5629
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5629
END:VEVENT
BEGIN:VEVENT
SUMMARY:’t Hooft Anomalies for Discrete Symmetries (Quantum Spacetime Se
minar Series) (Part 2)
DTSTART;VALUE=DATE-TIME:20170417T090000Z
DTEND;VALUE=DATE-TIME:20170417T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5630@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
5630
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5630
END:VEVENT
BEGIN:VEVENT
SUMMARY:’t Hooft Anomalies for Discrete Symmetries (Quantum Spacetime Se
minar Series) (Part 3)
DTSTART;VALUE=DATE-TIME:20170418T053000Z
DTEND;VALUE=DATE-TIME:20170418T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5632@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
5632
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5632
END:VEVENT
BEGIN:VEVENT
SUMMARY:Causality Constraints in Quantum Field Theory (Tata-Infosys Lectu
res Series - Lecture 1)
DTSTART;VALUE=DATE-TIME:20170419T060000Z
DTEND;VALUE=DATE-TIME:20170419T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5633@cern.ch
DESCRIPTION:Causality places nontrivial constraints on QFT in Lorentzian s
ignature\, for example fixing the signs of certain terms in the low energy
Lagrangian. In conformal field theory\, I will show how causality is enc
oded in crossing symmetry and reflection positivity of Euclidean correlato
rs\, and derive constraints on the interactions of low-lying operators dir
ectly from the conformal bootstrap. I will explain the connection between
the causality constraints in the lightcone limit and the averaged null ene
rgy condition. In particular\, causality implies that the averaged null en
ergy must be positive in interacting quantum field theory in flat spacetim
e. I will also show that in four-dimensions\, conformal field theories wit
h large-N and a sparse spectrum exhibit universal\, gravity-like behavior
and consequently\, the anomaly coefficients satisfy a=c.\n\nhttps://indico
.tifr.res.in/indico/conferenceDisplay.py?confId=5633
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5633
END:VEVENT
BEGIN:VEVENT
SUMMARY:AdS from optimization of path-integrals in CFTs (Tea-Duality)
DTSTART;VALUE=DATE-TIME:20170420T060000Z
DTEND;VALUE=DATE-TIME:20170420T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5636@cern.ch
DESCRIPTION:In this talk we will discuss a formulation of optimization of
Euclidean path-integrals describing the wave-functions in CFT’s. We will
argue that for a ground state in 2D- CFT\, the optimization leads to the
metric of a hyperbolic space (i.e. time-slice of 3-dim AdS). We will see h
ow our method reproduces the density matrix and also the holographic entan
glement entropy correctly. We will also discuss the connection to the cont
inuous version of conjectured relations between tensor networks and our me
thod.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=563
6
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5636
END:VEVENT
BEGIN:VEVENT
SUMMARY:Causality Constraints in Quantum Field Theory (Tata-Infosys Lectu
res Series - Lecture 2)
DTSTART;VALUE=DATE-TIME:20170421T060000Z
DTEND;VALUE=DATE-TIME:20170421T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5634@cern.ch
DESCRIPTION:Causality places nontrivial constraints on QFT in Lorentzian s
ignature\, for example fixing the signs of certain terms in the low energy
Lagrangian. In conformal field theory\, I will show how causality is enc
oded in crossing symmetry and reflection positivity of Euclidean correlato
rs\, and derive constraints on the interactions of low-lying operators dir
ectly from the conformal bootstrap. I will explain the connection between
the causality constraints in the lightcone limit and the averaged null ene
rgy condition. In particular\, causality implies that the averaged null en
ergy must be positive in interacting quantum field theory in flat spacetim
e. I will also show that in four-dimensions\, conformal field theories wit
h large-N and a sparse spectrum exhibit universal\, gravity-like behavior
and consequently\, the anomaly coefficients satisfy a=c.\n\nhttps://indico
.tifr.res.in/indico/conferenceDisplay.py?confId=5634
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5634
END:VEVENT
BEGIN:VEVENT
SUMMARY:On heavy quark systems in quark-gluon plasma (Quantum Spacetime Se
minar Series)
DTSTART;VALUE=DATE-TIME:20170424T060000Z
DTEND;VALUE=DATE-TIME:20170424T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5645@cern.ch
DESCRIPTION:High energy heavy ion collisions explore the high temperature
deconfined ("quark-gluon plasma") phase of QCD. Heavy quark observables pr
ovide a very interesting probe of the plasma. Theoretically\, the large ma
ss of the quark leads to simplifications\, which allow quantitative study
of some observables even in the strongly coupled plasma. I will discuss so
me non-perturbative investigations into heavy quark observables. In partic
ular\, I will discuss bb bound states in the plasma\, and energy loss of h
eavy quarks.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?con
fId=5645
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5645
END:VEVENT
BEGIN:VEVENT
SUMMARY:Some non supersymmetric dualities in 2+1 dimensions (Quantum Space
time Seminar Series)
DTSTART;VALUE=DATE-TIME:20170425T060000Z
DTEND;VALUE=DATE-TIME:20170425T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5646@cern.ch
DESCRIPTION:We will present some conjectures for potentially new nonsupers
ymmetric dualities in 2+1 dimensions. ABJM is believed to be dual to the I
R limit of N=8 super Yang Mills. We ask the question: are non supersymmetr
ic Bifundamental Chern Simons theories related to the IR limit of Yang Mil
ls theories with adjoint matter? Some evidence for such dualities may be o
btainable from perturbative calculations in a large flavor limit. Other du
alities may also be discussed.\n\nhttps://indico.tifr.res.in/indico/confer
enceDisplay.py?confId=5646
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5646
END:VEVENT
BEGIN:VEVENT
SUMMARY:Causality Constraints in Quantum Field Theory (Tata-Infosys Lectu
res Series - Lecture 3)
DTSTART;VALUE=DATE-TIME:20170427T043000Z
DTEND;VALUE=DATE-TIME:20170427T060000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5635@cern.ch
DESCRIPTION:Causality places nontrivial constraints on QFT in Lorentzian s
ignature\, for example fixing the signs of certain terms in the low energy
Lagrangian. In conformal field theory\, I will show how causality is enc
oded in crossing symmetry and reflection positivity of Euclidean correlato
rs\, and derive constraints on the interactions of low-lying operators dir
ectly from the conformal bootstrap. I will explain the connection between
the causality constraints in the lightcone limit and the averaged null ene
rgy condition. In particular\, causality implies that the averaged null en
ergy must be positive in interacting quantum field theory in flat spacetim
e. I will also show that in four-dimensions\, conformal field theories wit
h large-N and a sparse spectrum exhibit universal\, gravity-like behavior
and consequently\, the anomaly coefficients satisfy a=c.\n\nhttps://indico
.tifr.res.in/indico/conferenceDisplay.py?confId=5635
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5635
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Three Dimensional View of the SYK Model (Quantum Spacetime Semin
ar Series)
DTSTART;VALUE=DATE-TIME:20170529T060000Z
DTEND;VALUE=DATE-TIME:20170529T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5689@cern.ch
DESCRIPTION:We argue that the SYK model can be interpreted as a three dime
nsional scalar in AdS2 X S2/Z2. At strong coupling the KK spectrum reprodu
ces the SYK spectrum exactly\, and a non-standard propagator of the 3D the
ory reproduces the two point function of the bilocal fields. Furthermore\,
this three dimensional picture reproduces the leading finite coupling cor
rection to the "zero mode" contribution.\n\nhttps://indico.tifr.res.in/ind
ico/conferenceDisplay.py?confId=5689
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5689
END:VEVENT
BEGIN:VEVENT
SUMMARY:Surface transport properties of relativistic fluids (STMP Journal
Club)
DTSTART;VALUE=DATE-TIME:20170614T060000Z
DTEND;VALUE=DATE-TIME:20170614T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5711@cern.ch
DESCRIPTION:In this talk\, we shall discuss some surface transport propert
ies of stationary localized configurations of relativistic fluids. This an
alysis would be performed with the help of equilibrium effective action fo
r the shape-field\, characterising the location of the surface. We will co
nsider both ordinary fluids and superfluids and demonstrate how the bulk t
ransport coefficients influence surface transport. In particular\, we shal
l obtain several interesting parity-odd surface effects.\n\nhttps://indico
.tifr.res.in/indico/conferenceDisplay.py?confId=5711
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5711
END:VEVENT
BEGIN:VEVENT
SUMMARY:1/N and M/N Anomalous Dimensions in Chern-SImons with Matter ((ST
MP Journal Club)
DTSTART;VALUE=DATE-TIME:20170615T060000Z
DTEND;VALUE=DATE-TIME:20170615T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5714@cern.ch
DESCRIPTION:We will first review how planar three-point functions can be u
sed to determine 1/N spectrum of higher spin operators in Chern-Simons the
ory coupled to fundamental fermions to all orders in the 't Hooft coupling
\, based on work with GIombi\, Gurucharan\, Kirilin\, and Skvortsov. We th
en show how this can be extended to calculate M/N anomalous dimensions of
higher spin operators to al orders in both 't Hooft couplings\, in U(N) ti
mes U(M) bifundamental Chern SImons theory\, which is work in progress wit
h V Gurucharan. Finally\, we point out a duality connecting bifundamental
(critical) bosons to bifundamental fermions\, reminiscent of the ABJ duali
ty that naturally follows from the vector model bosonization duality. We d
o not yet know how to extend this duality to finite N and M\, however. Oth
er speculative dualities may be discussed.\n\nhttps://indico.tifr.res.in/i
ndico/conferenceDisplay.py?confId=5714
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5714
END:VEVENT
BEGIN:VEVENT
SUMMARY:QFT and the Jones Polynomia (STMP Journal Club)
DTSTART;VALUE=DATE-TIME:20170616T060000Z
DTEND;VALUE=DATE-TIME:20170616T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5710@cern.ch
DESCRIPTION:I review Witten's classic paper that solved pure Chern Simons
theory 28 years ago.\n\nhttps://indico.tifr.res.in/indico/conferenceDispla
y.py?confId=5710
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5710
END:VEVENT
BEGIN:VEVENT
SUMMARY:A note on S-matrix bootstrap with linear spectrum
DTSTART;VALUE=DATE-TIME:20170725T060000Z
DTEND;VALUE=DATE-TIME:20170725T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5773@cern.ch
DESCRIPTION:We work out constraints imposed by channel duality and analyti
city on tree-level amplitudes of four identical real scalars\, with the as
sumptions of a linear spectrum of exchanged particles and Regge asymptotic
behaviour. We reduce the requirement of channel duality to a countably in
finite set of equations in the general case. We show that channel duality
uniquely fixes the soft Regge behaviour of the amplitudes to that found in
String theory\, (as)2t. Specialising to the case of tachyonic external pa
rticles\, we use channel duality to show that the amplitude can be any one
in an infinite-dimensional parameter space\, and present evidence that un
itarity does not significantly reduce the dimension of the space of amplit
udes.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=577
3
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5773
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black Holes at Criticality (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20170816T090000Z
DTEND;VALUE=DATE-TIME:20170816T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5818@cern.ch
DESCRIPTION:The extended thermodynamics of Black Holes in AdS has a phase
structure in the (T\, p) plane that includes a line of first order phase t
ransitions ending in a second order transition point. Scaling symmetries o
f black holes at that critical point show the appearance of fully decouple
d Rindler space-time in a new double scaling limit (C. Johnson\, 2017). Ma
king use of the pdV terms in the first law of extended black hole mechanic
s\, holographic heat engines are defined and their holographic meaning is
explored (open question). It is argued that the efficiency of holographic
heat engines approaches Carnot efficiency at finite power at the Critical
point (Campisi/Fazio 2016\, C. Johnson 2017\, CB/P K Yerra 2017).\n\nhttps
://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5818
LOCATION: AG66
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5818
END:VEVENT
BEGIN:VEVENT
SUMMARY:Small step towards computing all loop exact arbitrary m to n scatt
ering amplitude in Chern-Simons matter theories (Quantum Spacetime Seminar
Series)
DTSTART;VALUE=DATE-TIME:20170817T043000Z
DTEND;VALUE=DATE-TIME:20170817T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5821@cern.ch
DESCRIPTION:In this talk\, we will discuss few interesting observations su
ch as BCFW recursions\, dual conformal invariance etc in scattering matrix
of Chern-Simons matter theories. We will discuss how this might be helpfu
l in computing all loop exact arbitrary m to n scattering matrix.\n\nhttps
://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5821
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5821
END:VEVENT
BEGIN:VEVENT
SUMMARY:Local quenches and quantum chaos from higher spin perturbations (Q
uantum Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20170824T043000Z
DTEND;VALUE=DATE-TIME:20170824T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5827@cern.ch
DESCRIPTION:We study local quenches in 1+1 dimensional conformal field the
ories at large-c by operators carrying higher spin charge. Viewing such st
ates as solutions in Chern-Simons theory\, representing infalling massive
particles with spin-three charge in the BTZ background\, we use the Wilson
line prescription to compute the single-interval entanglement entropy (EE
) and scrambling time following the quench. We find that the change in EE
is finite (and real) only if the spin-three charge q is bounded by the ene
rgy of the perturbation E\, as |q|/c E2/C2. We show that the Wilson line/E
E correlator deep in the quenched regime and its expansion for small quenc
h widths overlaps with the Regge limit for chaos of the out-of-time-ordere
d correlator. We further find that the scrambling time for the two-sided m
utual information between two intervals in the thermofield double state in
creases with increasing spin-three charge\, diverging when the bound is sa
turated. For larger values of the charge\, the scrambling time is shorter
than for pure gravity and controlled by the spin-three Lyapunov exponent 4
π/β. In a CFT with higher spin chemical potential\, dual to a higher spi
n black hole\, we find that the chemical potential must be bounded to ensu
re that the mutual information is a concave function of time and entanglem
ent speed is less than the speed of light. In this case\, a quench with ze
ro higher spin charge yields the same Lyapunov exponent as pure Einstein g
ravity.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5
827
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5827
END:VEVENT
BEGIN:VEVENT
SUMMARY: Gauge and Gravitational anomalies of Discrete Z_{N} symme
tries
DTSTART;VALUE=DATE-TIME:20170828T103000Z
DTEND;VALUE=DATE-TIME:20170828T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5840@cern.ch
DESCRIPTION:We will discuss the consistency conditions which a discrete ZN
symmetry should satisfy in order that it is not violated by gauge and gra
vitational instantons. As examples\, we enlist all ZN R-symmetries (N=2\,3
\,4) in the minimally supersymmetric standard model (MSSM) that are free f
rom gauge and gravitational anomalies. We show that there exists non-anoma
lous discrete symmetries that forbid Baryon number violation up to dimensi
on 6 level (in superspace). We also observe that there exists no non-anoma
lous Z3 R-symmetry in the MSSM. Furthermore\, we point out that in a theor
y with one Majorana spin 3/2 Gravitino\, a large class of Z4 R-symmetries
are violated in the presence of Eguchi-Hanson (EH) gravitational instanton
. This is also in general true for higher ZN R-symmetries. We also notice
that in 4 dimensional N=1 supergravity\, the global U(1) R-symmetry is alw
ays violated by the EH instanton irrespective of the matter content of the
theory.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
5840
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5840
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Gravity in 2-dim and the Sachdev-Ye-Kitaev Model (Quantum
Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20170828T060000Z
DTEND;VALUE=DATE-TIME:20170828T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5841@cern.ch
DESCRIPTION:We will discuss the Sachdev-Ye-Kitaev (SYK) model of fermions
with random interactions in 1-dim and its 2-dim quantum gravity dual. We w
ill present a geometric derivation of Schwarzian action of the low lying m
odes of the SYK model\, which are responsible for the saturation of the qu
antum chaos bound\, in terms of `boundary gravitons'. We also discuss the
coupling of the infinite series of bulk scalars (corresponding to massive
SYK states) to 2-dim gravity.\n\nhttps://indico.tifr.res.in/indico/confere
nceDisplay.py?confId=5841
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5841
END:VEVENT
BEGIN:VEVENT
SUMMARY:Universal Correlators from the Holomorphic Bootstrap (Quantum Spac
etime Seminar)
DTSTART;VALUE=DATE-TIME:20170904T060000Z
DTEND;VALUE=DATE-TIME:20170904T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5850@cern.ch
DESCRIPTION:We elaborate and extend the method of Wronskian differential e
quations for conformal blocks to compute four-point correlation functions
on the plane for classes of primary fields in rational (and possibly more
general) conformal field theories. We apply this technique to compute corr
elators for the WZW models corresponding to the Deligne-Cvitanovic excepti
onal series of Lie algebras. The application turns out to be subtle in cer
tain cases where there are multiple decoupled primaries. The power of this
approach is demonstrated by applying it to compute four-point functions f
or the Baby Monster CFT\, which does not belong to any minimal series.\n\n
https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5850
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5850
END:VEVENT
BEGIN:VEVENT
SUMMARY:N=1 Lagrangians for generalized Argyres-Douglas theories
DTSTART;VALUE=DATE-TIME:20170907T083000Z
DTEND;VALUE=DATE-TIME:20170907T093000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5857@cern.ch
DESCRIPTION:“ Argyres-Douglas (AD) theories are 4d conformal field theor
ies with N=2 supersymmetry. They were originally formulated as the low ene
rgy theory at certain special locii on the Coulomb branch of 4d N=2 theori
es\, where particles with mutually non-local electromagnetic charges becom
e massless simultaneously. It is widely believed that it impossible to wri
te a Lorentz invariant Lagrangian that simultaneously describes electrons
as well as monopoles/dyons as elementary excitations. Due to this a Lagran
gian for AD theories was not known. I will present some recent work by my
collaborators and me\, wherein N=1 Lagrangians flowing to IR fixed points
described by AD theories were obtained. As is obvious\, these Lagrangians
have accidental enhancement of supersymmetry in IR. An immediate applicati
on of our work was the computation of the full N=2 superconformal index of
AD theories. A method to compute this was not available before our work.
”\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5857
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5857
END:VEVENT
BEGIN:VEVENT
SUMMARY:Notes on Melonic O(N)^{q−1} Tensor Models (Quantum Space
time Seminar)
DTSTART;VALUE=DATE-TIME:20170911T060000Z
DTEND;VALUE=DATE-TIME:20170911T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5864@cern.ch
DESCRIPTION:It has recently been demonstrated that the large N limit of a
model of fermions charged under the global/gauge symmetry group O(N)q-1 ag
rees with the large N limit of the SYK model. In this talk we will investi
gate aspects of the dynamics of the O(N)q-1 theories that differ from thei
r SYK counterparts. We argue that the spectrum of fluctuations about the f
inite temperature saddle point in these theories has (q-1) (N2)/2 new ligh
t modes in addition to the light Schwarzian mode that exists even in the S
YK model\, suggesting that the bulk dual description of theories differ si
gnificantly if they both exist. We also study the thermal partition functi
on of a mass deformed version of the SYK model. At large mass we show that
the effective entropy of this theory grows with energy like E ln E (i.e.
faster than Hagedorn) up to energies of order N2. The canonical partition
function of the model displays a deconfinement or Hawking Page type phase
transition at temperatures of order 1/ ln N. We derive these results in th
e large mass limit but argue that they are qualitatively robust to small c
orrections in J/m.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.
py?confId=5864
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5864
END:VEVENT
BEGIN:VEVENT
SUMMARY: Rational Conformal Field Theory: A primer (Quantum Spacetime Semi
nar)
DTSTART;VALUE=DATE-TIME:20170918T060000Z
DTEND;VALUE=DATE-TIME:20170918T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5885@cern.ch
DESCRIPTION:A rational conformal field theory (RCFT) is a CFT with a finit
e number of primaries of the Virasoro algebra (appropriately extended). Th
e tensor product of two such representations naturally leads to the notion
of chiral vertex operators (CVOs). Correlation functions of CVOs\, known
as conformal blocks\, encode much of the content of the CFT and a general
correlation function can be written as a linear combination of a basis of
conformal blocks.\n\nConformal invariance imposes very strong restrictions
on the space of conformal blocks of an RCFT. These constraints were effec
tively utilised by Moore and Seiberg [1\,2] to study many features of the
RCFT. We review this work in this talk and apply it to simple examples lik
e the Ising and the U(1) WZW models. If time permits\, we shall also revie
w the relation of the above ideas to Chern-Simons theory.\n\nReferences\n=
========\n[1] G. W. Moore and N. Seiberg\, Polynomial Equations for Ration
al Conformal Field Theories\, Phys. Lett. B 212\, 451 (1988).\n\n[2] Moore
G.\, Seiberg N.\, Lectures on RCFT\, Trieste 1989\, Proceedings\, Superst
rings '89* 1-129.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.p
y?confId=5885
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5885
END:VEVENT
BEGIN:VEVENT
SUMMARY: Rational Conformal Field Theory: A primer (Part 2)
DTSTART;VALUE=DATE-TIME:20170921T043000Z
DTEND;VALUE=DATE-TIME:20170921T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5891@cern.ch
DESCRIPTION:A rational conformal field theory (RCFT) is a CFT with a finit
e number of primaries of the Virasoro algebra (appropriately extended). Th
e tensor product of two such representations naturally leads to the notion
of chiral vertex operators (CVOs). Correlation functions of CVOs\, known
as conformal blocks\, encode much of the content of the CFT and a general
correlation function can be written as a linear combination of a basis of
conformal blocks.\n\nConformal invariance imposes very strong restrictions
on the space of conformal blocks of an RCFT. These constraints were effec
tively utilised by Moore and Seiberg [1\,2] to study many features of the
RCFT. We review this work in this talk and apply it to simple examples lik
e the Ising and the U(1) WZW models. If time permits\, we shall also revie
w the relation of the above ideas to Chern-Simons theory.\n\nReferences\n=
========\n[1] G. W. Moore and N. Seiberg\, Polynomial Equations for Ration
al Conformal Field Theories\, Phys. Lett. B 212\, 451 (1988).\n\n[2] Moore
G.\, Seiberg N.\, Lectures on RCFT\, Trieste 1989\, Proceedings\, Superst
rings '89* 1-129.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.p
y?confId=5891
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5891
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constraints on parity violating conformal field theories in d=3 (Q
uantum Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20170925T060000Z
DTEND;VALUE=DATE-TIME:20170925T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5898@cern.ch
DESCRIPTION:We derive constraints on three-point functions involving the s
tress tensor\, T\, and a conserved U(1) current\, j\, in 2+1 dimensional c
onformal field theories that violate parity\, using conformal collider bou
nds introduced by Hofman and Maldacena. Conformal invariance allows parity
-odd tensor-structures for the and correlation functions which are unique
to three space-time dimensions. Let the parameters which determine the cor
relation function be t4 and αT\, where αT is the parity-violating contri
bution. Similarly let the parameters which determine correlation function
be a2\, and αJ\, where αJ is the parity-violating contribution. We show
that the parameters (t4\,αT) and (α2 \, αJ) are bounded to lie inside a
disc at the origin of the t4 - αT plane and the α2 - αJ plane respecti
vely. We then show that large N Chern-Simons theories coupled to a fundame
ntal fermion/boson lie on the circle which bounds these discs. The `t Hoof
t coupling determines the location of these theories on the boundary circl
es.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5898
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5898
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sachdev Ye Kitaev model from the perspective of a glassman
DTSTART;VALUE=DATE-TIME:20170929T060000Z
DTEND;VALUE=DATE-TIME:20170929T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5915@cern.ch
DESCRIPTION:SYK models are being considered as a toy version of black hole
s. Years ago this class of models quantum as well as classical) had been p
roposed as toy versions of glasses\, and as such\, extensively studied. In
particular\, time reparametrization was already a main player there. It s
eems that we have things to learn from the developments taking place now i
n field theory\, and maybe we have something to offer.\n\nhttps://indico.
tifr.res.in/indico/conferenceDisplay.py?confId=5915
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5915
END:VEVENT
BEGIN:VEVENT
SUMMARY:Asymptotic symmetries in QED and sub-leading soft photon theorem (
Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20171009T060000Z
DTEND;VALUE=DATE-TIME:20171009T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5933@cern.ch
DESCRIPTION:Symmetry structure of Gauge theories has received significant
attention in recent years. In the case of Abelian gauge theories\, it was
shown by He et al that there exists an infinite number of symmetries param
etrized by functions on the conformal sphere whose Ward identities are equ
ivalent to Weinberg soft photon theorem. In this talk we show that Abelian
gauge theories admit yet another infinite dimensional group of symmetries
whose Ward identities are equivalent to the sub-leading soft photon theor
em. We show that the charges associated to the above class of symmetries a
re sensitive to certain three point functions of the theory and are correc
ted by irrelevant operators of specific dimensions. Our analysis shows tha
t the sub-leading soft photon theorem in any tree level scattering amplitu
de is a statement about Asymptotic symmetries of the S matrix.\n\nhttps://
indico.tifr.res.in/indico/conferenceDisplay.py?confId=5933
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5933
END:VEVENT
BEGIN:VEVENT
SUMMARY:Open EFT and Renormalisation (Part3)
DTSTART;VALUE=DATE-TIME:20171013T060000Z
DTEND;VALUE=DATE-TIME:20171013T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5945@cern.ch
DESCRIPTION:While the notion of open quantum systems is itself old\, many
of the existing studies deal with quantum mechanical systems rather than q
uantum field theories. In this talk\, I will begin with a brief review of
field theoretical/path integral tools currently available to deal with op
en quantum field theories. Then\, I will go on to apply these tools to an
open version of $\\phi^4$ theory in four spacetime dimensions and its one
loop renormalisability. I will also comment on the renormalisability of
Lindblad structure.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay
.py?confId=5945
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5945
END:VEVENT
BEGIN:VEVENT
SUMMARY:SYK Models with Global Symmetry (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20171016T060000Z
DTEND;VALUE=DATE-TIME:20171016T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5950@cern.ch
DESCRIPTION:In this talk\, we will discuss the Sachdev-Ye-Kitaev model wit
h global symmetry via the bi-local collective field theory. We derive the
collective action for the SYK model with global symmetry\, and we will stu
dy the large N expansion thereof. At the strong coupling limit\, we will s
how that the global symmetry is enhanced to the local symmetry in addition
to the emergent reparameterization symmetry. These emergent symmetries ar
e spontaneously and explicitly broken\, which leads to Schwarzian action p
lus an action for a particle on the group manifold as effective actions. W
e will also discuss various four point functions: the spectrum of the mode
l from their OPE limit and the long time behaviors of the out-of-time-orde
red correlators.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py
?confId=5950
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5950
END:VEVENT
BEGIN:VEVENT
SUMMARY:Axions in the CMB sky (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20171023T060000Z
DTEND;VALUE=DATE-TIME:20171023T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5959@cern.ch
DESCRIPTION:Conversion of CMB photons to axion like particles is one of th
e most sensitive way to look for these pseudoscalar particles. I will revi
ew the physics of conversion which is similar to neutrino oscillations. I
will discuss different signatures of axions in the CMB maps and constraint
s on axion like particles from current and future CMB experiments.\n\nhttp
s://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5959
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5959
END:VEVENT
BEGIN:VEVENT
SUMMARY:Current status on polynomial invariants of knots- attempt towards
classification (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20171030T060000Z
DTEND;VALUE=DATE-TIME:20171030T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5974@cern.ch
DESCRIPTION:I will describe the methodology of obtaining knot invariants f
rom Chern Simons field theory after reviewing well-known knot polynomials.
One of the challenging open problem is the classification of knots. To ch
eck the power of Chern-Simons field theoretic invariants\, we investigate
mutant knot pairs which are indistinguishable by well-known polynomials. F
inally\, I will review the developments providing justification for intege
r coefficients of \nthe Laurent form of knot polynomials.\n\nhttps://indic
o.tifr.res.in/indico/conferenceDisplay.py?confId=5974
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5974
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strategies for bootstrap (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20171106T060000Z
DTEND;VALUE=DATE-TIME:20171106T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-5991@cern.ch
DESCRIPTION:I will discuss recent developments in techniques to extract in
formation from the conformal bootstrap in certain limits. In particular\,
I will show how to set up the conventional bootstrap equations in Mellin s
pace and extract all order (in inverse conformal spin) results for double
trace operators. I will discuss some applications of such techniques.\n\nh
ttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5991
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=5991
END:VEVENT
BEGIN:VEVENT
SUMMARY:Amplitudes and hidden symmetries in N=2 Chern-Simons matter theory
. (Tea-Duality Seminar)
DTSTART;VALUE=DATE-TIME:20171109T040000Z
DTEND;VALUE=DATE-TIME:20171109T050000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6000@cern.ch
DESCRIPTION:Chern-Simons theories coupled to matter have a wide variety of
applications ranging from anyonic physics to quantum gravity via the AdS/
CFT correspondence. These theories enjoy a strong-weak duality that has be
en tested to a very good accuracy via large N computations. Scattering amp
litudes are some of the most basic observables in QFT’s. S matrices comp
uted to all orders in the ’t Hooft coupling serve as important testing g
rounds for the strong-weak duality. Although beginning with 4 point amplit
udes this is doable\, the complexity of the problem increases with the num
ber of external legs. As a first step towards computing all loop arbitrary
n point amplitudes\, we address the problem of computing arbitrary n poin
t tree level amplitudes. We show that BCFW recursion relations can be used
to compute all tree level scattering amplitudes in terms of 2 → 2 scatt
ering amplitude in U(N) N = 2 Chern- imons (CS) theory coupled to matter i
n fundamental representation. As a byproduct\, we also obtain a recursion
relation for the CS theory coupled to regular fermions\, even though in th
is case standard BCFW deformations do not have a good asymptotic behavior.
We then proceed to take the first steps towards all loop computations of
arbitrary n point amplitudes. As a first step we explain the result of arX
iv:1505.06571\, where it was shown that the 2 → 2 scattering is tree lev
el exact to all orders except in the anyonic channel\, where it gets renor
malized by a simple function of ’t Hooft coupling. We show that tree lev
el 2 ! 2 scattering amplitudes in 3d N = 2 Chern-Simons theory coupled to
a fundamental chiral multiplet are dual superconformal invariant. We furth
er show that the large N all loop exact amplitude also has dual superconfo
rmal symmetry\, which implies dual superconformal symmetry is all loop exa
ct which is in contrast to other known highly supersymmetric examples such
as N = 4 SYM and ABJM where the dual superconformal symmetry is in genera
l anomalous The presence of superconformal and dual superconformal symmetr
y indicate the existence of a Yangian symmetry\, further providing indicat
ions that the N=2 theory may be integrable.\n\nhttps://indico.tifr.res.in/
indico/conferenceDisplay.py?confId=6000
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6000
END:VEVENT
BEGIN:VEVENT
SUMMARY:SYK-chaotic and Global Charges (Quantum Spacetime Series Seminar)
DTSTART;VALUE=DATE-TIME:20171113T060000Z
DTEND;VALUE=DATE-TIME:20171113T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6001@cern.ch
DESCRIPTION:In this talk\, I will briefly discuss the effect of conserved
charges on the quantum chaotic properties of an SYK-type model. The treatm
ent is simple and semi-analytic\, which yields a Lyapunov exponent as a se
nsitive function of the chemical potential. I will also comment on the mot
ivations for studying such models\, from a holographic perspective. I will
end with speculations and some words on ongoing works.\n\nhttps://indico.
tifr.res.in/indico/conferenceDisplay.py?confId=6001
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6001
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lattice Formulation of N=2* Super Yang-Mills (Quantum Spacetime Se
minar Series)
DTSTART;VALUE=DATE-TIME:20171120T060000Z
DTEND;VALUE=DATE-TIME:20171120T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6024@cern.ch
DESCRIPTION:Four-dimensional N=2* super Yang-Mills theory is obtained by i
ntroducing a one parameter mass deformation to one of the hypermultiplets
of four-dimensional \nN=4 Yang-Mills. Four- dimensional N=2* Yang-Mills
is a non-conformal gauge theory and its gravitational dual has been cons
tructed by Pilch and Warner. The \ntheory exhibits many interesting prop
erties at finite temperature. We formulate N=2* \nsuper Yang-Mills on a
Euclidean spacetime lattice using the method of topological twisting. T
he lattice formulation is local\, gauge invariant\, doubler free \nand
preserves one supersymmetry charge at finite lattice spacing. Such a co
nstruction can be used for finite temperature nonperturbative explorations
of the theory and\nvalidate the gauge-gravity duality conjecture in a non
-conformal theory.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.
py?confId=6024
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6024
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bosonization on a lattice in 2+1D (Quantum Spacetime Seminar Serie
s)
DTSTART;VALUE=DATE-TIME:20171123T043000Z
DTEND;VALUE=DATE-TIME:20171123T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6044@cern.ch
DESCRIPTION:Duality between bosonic and fermionic systems in two spacetime
dimensions is well-understood\, but analogous dualities in higher dimensi
ons remain mysterious despite a large body of work on the subject\, includ
ing the recent array of remarkable results concerning bosonization in Cher
n-Simons-matter theories in three dimensions. In this talk I will show ho
w 2D bosonization can be extended to 3D\, with bilinears of fermions on ar
bitrary lattices being mapped to gauge-invariant observables in a new clas
s of lattice gauge theories. The essential new ingredient is a modified g
auge constraint which implements a lattice version of flux attachment\, an
d a notion of discrete spin structure will be seen to emerge.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=6044
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6044
END:VEVENT
BEGIN:VEVENT
SUMMARY:Large spin bootstrap in Mellin space
DTSTART;VALUE=DATE-TIME:20171127T060000Z
DTEND;VALUE=DATE-TIME:20171127T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6035@cern.ch
DESCRIPTION:I will discuss how to simplify large spin bootstrap in Mellin
space. I will show how to compute the CFT data of large spin double trace
operators in terms of known mathematical functions. An explicit expression
for the anomalous dimension and OPE coefficients of such operators can be
given as an asymptotic expansion in inverse conformal spin to any order.
I will also compare the conventional bootstrap with the recently developed
Mellin bootstrap.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.
py?confId=6035
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6035
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black Hole Thermodynamics and the Information Paradox in 2d CFT (
The Tata-Infosys Lecture series)
DTSTART;VALUE=DATE-TIME:20171128T060000Z
DTEND;VALUE=DATE-TIME:20171128T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6048@cern.ch
DESCRIPTION:I will discuss how black hole thermodynamics in 2+1 dimensiona
l gravity arises universally from 1+1 dimensional conformal field theory a
t large central charge. The black hole information paradox in AdS/CFT can
be cast as a series of more or less tractable sub-problems. I will explain
how many of these can also be addressed in the case of 2d CFT by computi
ng nonperturbative effects in GN expansion. Finally\, I will discuss how i
t's possible to reconstruct exact candidate bulk field operators in AdS3.
By examining the correlators of these bulk fields we will see how computab
le non-perturbative effects in quantum gravity lead to the breakdown of bu
lk locality.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?con
fId=6048
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6048
END:VEVENT
BEGIN:VEVENT
SUMMARY: A thermal Froissart-Gribov formula for CFTs (Quantum Spacetime S
eminar Series)
DTSTART;VALUE=DATE-TIME:20171128T043000Z
DTEND;VALUE=DATE-TIME:20171128T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6052@cern.ch
DESCRIPTION:The resurgence of the bootstrap program in CFTs in the last de
cade has mostly focussed on zero temperature correlators. We propose an ex
tension of the so-called analytic bootstrap for thermal correlators. Therm
al two-point functions can be OPE expanded into one point functions of ope
rators. For the two point function of scalar operators\, we propose a Froi
ssart-Gribov type formula which "inverts" this expansion\, i.e. the formul
a expresses the one-point functions as an integral of the discontinuity of
the two-point function along a certain locus. We test our formula in gene
ralized free field theory\, the large N Wilson Fisher theory. More ambitio
usly\, combining information learnt from the inversion formula with the KM
S condition\, we try to bootstrap the one point functions of the phi^2 and
stress tensor operators in the 3D Ising model.\n\nhttps://indico.tifr.res
.in/indico/conferenceDisplay.py?confId=6052
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6052
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black Hole Thermodynamics and the Information Paradox in 2d CFT (
The Tata-Infosys Lecture series)
DTSTART;VALUE=DATE-TIME:20171129T060000Z
DTEND;VALUE=DATE-TIME:20171129T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6049@cern.ch
DESCRIPTION:I will discuss how black hole thermodynamics in 2+1 dimensiona
l gravity arises universally from 1+1 dimensional conformal field theory a
t large central charge. The black hole information paradox in AdS/CFT can
be cast as a series of more or less tractable sub-problems. I will explain
how many of these can also be addressed in the case of 2d CFT by computin
g nonperturbative effects in GN expansion. Finally\, I will discuss how it
's possible to reconstruct exact candidate bulk field operators in AdS3. B
y examining the correlators of these bulk fields we will see how computabl
e non-perturbative effects in quantum gravity lead to the breakdown of bul
k locality.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?conf
Id=6049
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6049
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black Hole Thermodynamics and the Information Paradox in 2d CFT (
The Tata-Infosys Lecture series)
DTSTART;VALUE=DATE-TIME:20171130T043000Z
DTEND;VALUE=DATE-TIME:20171130T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6050@cern.ch
DESCRIPTION:I will discuss how black hole thermodynamics in 2+1 dimensiona
l gravity arises universally from 1+1 dimensional conformal field theory a
t large central charge. The black hole information paradox in AdS/CFT can
be cast as a series of more or less tractable sub-problems. I will explain
how many of these can also be addressed in the case of 2d CFT by computin
g nonperturbative effects in GN expansion. Finally\, I will discuss how it
's possible to reconstruct exact candidate bulk field operators in AdS3. B
y examining the correlators of these bulk fields we will see how computabl
e non-perturbative effects in quantum gravity lead to the breakdown of bul
k locality.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?conf
Id=6050
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6050
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermal equivariance and its applications (Tata-Infosys Lecture Se
ries)
DTSTART;VALUE=DATE-TIME:20171205T060000Z
DTEND;VALUE=DATE-TIME:20171205T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6071@cern.ch
DESCRIPTION:I will describe how techniques from topological field theory a
nd equivariant cohomology find a role in physical problems. I will define
the notion of thermal equivariance which will involve gauging thermal diff
eomorphisms\, and argue that these constructions naturally lead to entropy
being interpretable as a Noether current. I will outline an application
to constructing dissipative hydrodynamic effective actions\, reproducing p
reviously known facts about the admissible constitutive relations.\n\nhttp
s://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6071
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6071
END:VEVENT
BEGIN:VEVENT
SUMMARY:Applications of M-theory Uplifted Desingularized Conifold Geometri
es Relevant to Holographic Thermal QCD at Finite Coupling
DTSTART;VALUE=DATE-TIME:20171206T060000Z
DTEND;VALUE=DATE-TIME:20171206T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6070@cern.ch
DESCRIPTION:Using a top-down holographic dual of large-N thermal QCD of Da
sgupta et al [2009]\, its type IIA mirror and M-theory uplift worked out
by Dhuria and Misra [2013]\, we will discuss holographic computation of l
attice compatible deconfinement temperature\, the temperature dependence o
f DC conductivity and the N(ext to) L(eading) O(rder) correction to diffus
ion constant\, speed of sound\, the shear-viscosity-to -entropy-density ra
tio of large-N thermal QCD. On the holographic phenomenology side\, we wi
ll discuss evaluation of 0++\, 0--\, 0-+\, 1++\, 2++ Glueball masses using
the same gravitational dual(s).\n\nhttps://indico.tifr.res.in/indico/conf
erenceDisplay.py?confId=6070
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6070
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermal equivariance and its applications (Tata-Infosys Lecture S
eries))
DTSTART;VALUE=DATE-TIME:20171206T043000Z
DTEND;VALUE=DATE-TIME:20171206T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6072@cern.ch
DESCRIPTION:I will describe how techniques from topological field theory a
nd equivariant cohomology find a role in physical problems. I will define
the notion of thermal equivariance which will involve gauging thermal diff
eomorphisms\, and argue that these constructions naturally lead to entropy
being interpretable as a Noether current. I will outline an application
to constructing dissipative hydrodynamic effective actions\, reproducing p
reviously known facts about the admissible constitutive relations.\n\nhttp
s://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6072
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6072
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermal equivariance and its applications (Tata-Infosys Lecture Se
ries)
DTSTART;VALUE=DATE-TIME:20171207T043000Z
DTEND;VALUE=DATE-TIME:20171207T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6073@cern.ch
DESCRIPTION:I will describe how techniques from topological field theory a
nd equivariant cohomology find a role in physical problems. I will define
the notion of thermal equivariance which will involve gauging thermal diff
eomorphisms\, and argue that these constructions naturally lead to entropy
being interpretable as a Noether current. I will outline an application
to constructing dissipative hydrodynamic effective actions\, reproducing p
reviously known facts about the admissible constitutive relations.\n\nhttp
s://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6073
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6073
END:VEVENT
BEGIN:VEVENT
SUMMARY:Asymptotic Symmetries and Soft Theorems in Quantum Field Theory (T
ata-Infosys Lecture Series)
DTSTART;VALUE=DATE-TIME:20171218T060000Z
DTEND;VALUE=DATE-TIME:20171218T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6102@cern.ch
DESCRIPTION:In this lecture series\, I will review recent developments in
the study of asymptotic symmetries in asymptotically flat spacetimes and e
xplore its connections to soft theorems and infrared divergences in quantu
m field theory\, memory effects which allow for measurement of the asympto
tic charges\, and black hole information.\n\nhttps://indico.tifr.res.in/in
dico/conferenceDisplay.py?confId=6102
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6102
END:VEVENT
BEGIN:VEVENT
SUMMARY:Asymptotic Symmetries and Soft Theorems in Quantum Field Theory (T
ata-Infosys Lecture Series)
DTSTART;VALUE=DATE-TIME:20171219T090000Z
DTEND;VALUE=DATE-TIME:20171219T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6103@cern.ch
DESCRIPTION:In this lecture series\, I will review recent developments in
the study of asymptotic symmetries in asymptotically flat spacetimes and e
xplore its connections to soft theorems and infrared divergences in quantu
m field theory\, memory effects which allow for measurement of the asympto
tic charges\, and black hole information.\n\nhttps://indico.tifr.res.in/in
dico/conferenceDisplay.py?confId=6103
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6103
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the dynamics of Near Extremal Blackholes
DTSTART;VALUE=DATE-TIME:20171219T050000Z
DTEND;VALUE=DATE-TIME:20171219T060000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6110@cern.ch
DESCRIPTION:We analyse the dynamics of near-extremal Reissner-Nordstrom bl
ack holes in asymptotically four-dimensional Anti de Sitter space (AdS4).
We work in the spherically symmetric approximation where the system can be
analysed in a two-dimensional model. The system has a linear specific hea
t close to extremality and out of time order correlators satisfy the chaos
bound. We explore whether at low energies\, these features can be obtaine
d by analyzing the near horizon AdS2 region with a boundary. In particular
\, we try to capture these features using an effective Schwarzian action c
orresponding to time reparametrisation modes at the AdS2 boundary.\n\nhttp
s://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6110
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6110
END:VEVENT
BEGIN:VEVENT
SUMMARY:Asymptotic Symmetries and Soft Theorems in Quantum Field Theory (T
ata-Infosys Lecture Series)
DTSTART;VALUE=DATE-TIME:20171220T090000Z
DTEND;VALUE=DATE-TIME:20171220T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6104@cern.ch
DESCRIPTION:In this lecture series\, I will review recent developments in
the study of asymptotic symmetries in asymptotically flat spacetimes and e
xplore its connections to soft theorems and infrared divergences in quantu
m field theory\, memory effects which allow for measurement of the asympto
tic charges\, and black hole information.\n\nhttps://indico.tifr.res.in/in
dico/conferenceDisplay.py?confId=6104
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6104
END:VEVENT
BEGIN:VEVENT
SUMMARY:’t Hooft anomalies in Chern-Simons-Matter theories
DTSTART;VALUE=DATE-TIME:20171221T060000Z
DTEND;VALUE=DATE-TIME:20171221T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6113@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
6113
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6113
END:VEVENT
BEGIN:VEVENT
SUMMARY:N-extended Super BMS_3 algebras
DTSTART;VALUE=DATE-TIME:20171228T060000Z
DTEND;VALUE=DATE-TIME:20171228T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6119@cern.ch
DESCRIPTION:We derive supersymmetric extensions of the three dimensional B
MS algebra (BMS3) with generic possible central extensions in two ways: Fi
rst by a suitable contraction of two copies of the extended superconformal
algebras and secondly\, by asymptotic symmetry analysis.\n\nhttps://indic
o.tifr.res.in/indico/conferenceDisplay.py?confId=6119
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6119
END:VEVENT
BEGIN:VEVENT
SUMMARY:A spin on gravitational radiation from the classical double copy
DTSTART;VALUE=DATE-TIME:20180112T060000Z
DTEND;VALUE=DATE-TIME:20180112T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6166@cern.ch
DESCRIPTION:The recent discovery of gravitational waves by LIGO gives new\
, pressing significance to the theoretical control of gravitational radiat
ion. We study a procedure to achieve this aim\, that is motivated by the B
CJ double copy correspondence between perturbative scattering amplitudes.
First\, we present a two-fold double copy for classical radiation from s
pinless sources. We compute\, to the leading order in perturbation theory\
, the scalar radiation generated by a system of bi-adjoint point charges c
oupled to a bi- adjoint scalar field. A set of color-to-kinematic substitu
tion rules transform the scalar radiation to Yang-Mills radiation from a s
ystem of adjoint color charges\, while a second application of the same r
ules gives radiation in a gravitational theory with point masses. Next\, w
e extend the classical double copy to spinning sources\, thus bringing it
closer to the astrophysically relevant case of compact binaries. Here\, we
compute\, to linear order in spin\, Yang-Mills radiation generated by a s
ystem of spinning color charges with chromomagnetic spin dipole couplings.
The color-to- kinematic substitution rules then yield radiation in a theo
ry with spinning sources coupled to the graviton\, dilaton and a 2-form ga
uge field. If this classical double copy correspondence persists to higher
orders in perturbation theory\, it suggests the possibility of vastly sim
plifying the calculation of gravitational radiation\, in particular\, that
from colliding compact objects.\n\nhttps://indico.tifr.res.in/indico/conf
erenceDisplay.py?confId=6166
LOCATION: A 269
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6166
END:VEVENT
BEGIN:VEVENT
SUMMARY:Null-Infinity and Unitary Representation of Poincare group (Quant
um Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20180115T060000Z
DTEND;VALUE=DATE-TIME:20180115T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6170@cern.ch
DESCRIPTION:In this talk I will describe some recent work on the relation
between massless particles\, null-infinity and unitary representation of P
oincare group.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?c
onfId=6170
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6170
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the Possibility of a Closed String Field Theory with Cubic Acti
on (The Tata - Infosys Lecture Series)
DTSTART;VALUE=DATE-TIME:20180122T060000Z
DTEND;VALUE=DATE-TIME:20180122T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6188@cern.ch
DESCRIPTION:String field theory is the quantum field theory that describes
the dynamics of interacting strings. Unlike the string field theory descr
ibing the dynamics of only open strings\, the practical utility of closed
string field theory\, the field theory describing the dynamics of closed s
trings\, is very limited. Moreover\, the action for closed string field th
eory is not polynomial. In this talk\, I shall describe a new construction
of closed string field theory that is well suited for doing computations.
Interestingly\, we will see that this new construction hints towards the
possibility of a cubic closed string field theory.\n\nhttps://indico.tifr.
res.in/indico/conferenceDisplay.py?confId=6188
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6188
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the Possibility of a Closed String Field Theory with Cubic Acti
on [Lecture 2] (The Tata - Infosys Lecture Series)
DTSTART;VALUE=DATE-TIME:20180123T053000Z
DTEND;VALUE=DATE-TIME:20180123T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6189@cern.ch
DESCRIPTION:String field theory is the quantum field theory that describes
the dynamics of interacting strings. Unlike the string field theory descr
ibing the dynamics of only open strings\, the practical utility of closed
string field theory\, the field theory describing the dynamics of closed s
trings\, is very limited. Moreover\, the action for closed string field th
eory is not polynomial. In this talk\, I shall describe a new construction
of closed string field theory that is well suited for doing computations.
Interestingly\, we will see that this new construction hints towards the
possibility of a cubic closed string field theory.\n\nhttps://indico.tifr.
res.in/indico/conferenceDisplay.py?confId=6189
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6189
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the Possibility of a Closed String Field Theory with Cubic Acti
on [Lecture 3] (The Tata - Infosys Lecture Series)
DTSTART;VALUE=DATE-TIME:20180124T060000Z
DTEND;VALUE=DATE-TIME:20180124T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6190@cern.ch
DESCRIPTION:String field theory is the quantum field theory that describes
the dynamics of interacting strings. Unlike the string field theory descr
ibing the dynamics of only open strings\, the practical utility of closed
string field theory\, the field theory describing the dynamics of closed s
trings\, is very limited. Moreover\, the action for closed string field th
eory is not polynomial. In this talk\, I shall describe a new construction
of closed string field theory that is well suited for doing computations.
Interestingly\, we will see that this new construction hints towards the
possibility of a cubic closed string field theory.\n\nhttps://indico.tifr.
res.in/indico/conferenceDisplay.py?confId=6190
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6190
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex Langevin dynamics and large-N gauge theories (Quantum Spac
etime Seminar series)
DTSTART;VALUE=DATE-TIME:20180205T060000Z
DTEND;VALUE=DATE-TIME:20180205T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6214@cern.ch
DESCRIPTION:Using complex Langevin dynamics and stochastic quantization we
examine the phase structure of a large N unitary matrix model at low temp
erature with finite quark chemical potential. This model is obtained as th
e low temperature effective theory of QCD with N number of colors and Nf n
umber of quark flavors. We simulate several observables of the model\, inc
luding Polyakov lines and quark number density\, for large N and N f . The
action is manifestly complex and thus the dominant contributions to the p
ath integral come from the space of complexified gauge field configuration
s. For this reason\, the Polyakov line eigenvalues lie off the unit circle
and out in the complex plane. A distinct feature of this model\, the occu
rrence of a series of Gross-Witten-Wadia transitions\, as a function of th
e quark chemical potential\, is reproduced using complex Langevin simulati
ons.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6214
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6214
END:VEVENT
BEGIN:VEVENT
SUMMARY: Constraining spectral densities in conformal field theories (Quan
tum Spacetime Seminar series)
DTSTART;VALUE=DATE-TIME:20180212T060000Z
DTEND;VALUE=DATE-TIME:20180212T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6223@cern.ch
DESCRIPTION:We derive constraints on spectral density of the shear correla
tors of conformal field theories at finite temperature in general d > 3 di
mensions. The resulting sum rules are due to conformal invariance and low
energy hydrodynamic behaviour. The sum rule states that a weighted integra
l of the spectral density over frequencies is proportional to the energy d
ensity of the theory. We show that the proportionality constant can be wri
tten in terms of the Hofman-Maldacena variables t2\, t4 which determine th
e three point function of the stress tensor. For theories which admit a tw
o derivative gravity dual this proportionality constant is given by d/(2(d
+1)). We also compute corrections to the holographic shear sum rule in pre
sence of higher derivative corrections to the Einstein-Hilbert action. We
find agreement between the sum rule obtained from a general CFT analysis a
nd holographic computation. We then use causality constraints and obtain b
ounds on the sum rule which are valid in any conformal field theory. Final
ly we demonstrate that the high frequency behavior of the spectral functio
n in the vector and the tensor channel are also determined by the Hofman-M
aldacena variables.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay
.py?confId=6223
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6223
END:VEVENT
BEGIN:VEVENT
SUMMARY:Semiclassical Methods: A Jumble of Results and Directions (Quantum
Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20180219T060000Z
DTEND;VALUE=DATE-TIME:20180219T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6245@cern.ch
DESCRIPTION:I will talk about the motivations for work in progress that ho
pes to better understand the relationship between resurgence\, supersymmet
ric gauge theory\, and conformal field theory. A common theme uniting thes
e lines of inquiry is the use of semiclassical methods. This talk is based
on joint work with P. N. Bala Subramanian (IISc).\n\nhttps://indico.tifr.
res.in/indico/conferenceDisplay.py?confId=6245
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6245
END:VEVENT
BEGIN:VEVENT
SUMMARY:Classification of 6d SCFTs and supersymmetric little string theori
es (Tata- Infosys Lecture Series) (Lecture 1)
DTSTART;VALUE=DATE-TIME:20180226T060000Z
DTEND;VALUE=DATE-TIME:20180226T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6259@cern.ch
DESCRIPTION:It is believed that the only interacting non-gravitational sup
ersymmetric UV complete theories in six dimensions are either SCFTs or sup
ersymmetric little string theories. I will discuss some approaches to clas
sify such theories. In one approach\, one attempts to formulate and solve
consistency conditions on the low-energy effective gauge theories arising
on the tensor branch of vacua of these theories. Another approach is based
on studying compactifications of F-theory which admit decoupling limits p
roducing these 6d theories. Such compactifications have been classified un
der the assumption that the base of the compactification manifold does not
carry O7+ planes. I will discuss this classification and preliminary atte
mpts at incorporating O7+ planes in the description. I will argue that a p
roper incorporation of O7+ planes requires a better understanding of the d
uality of F-theory with M-theory on the side of physics\, and tools for de
aling with singular elliptic fibrations on the side of mathematics.\n\nhtt
ps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6259
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6259
END:VEVENT
BEGIN:VEVENT
SUMMARY:Classification of 6d SCFTs and supersymmetric little string theori
es (Tata- Infosys Lecture Series) (Lecture 2)
DTSTART;VALUE=DATE-TIME:20180227T060000Z
DTEND;VALUE=DATE-TIME:20180227T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6260@cern.ch
DESCRIPTION:It is believed that the only interacting non-gravitational sup
ersymmetric UV complete theories in six dimensions are either SCFTs or sup
ersymmetric little string theories. I will discuss some approaches to clas
sify such theories. In one approach\, one attempts to formulate and solve
consistency conditions on the low-energy effective gauge theories arising
on the tensor branch of vacua of these theories. Another approach is based
on studying compactifications of F-theory which admit decoupling limits p
roducing these 6d theories. Such compactifications have been classified un
der the assumption that the base of the compactification manifold does not
carry O7+ planes. I will discuss this classification and preliminary atte
mpts at incorporating O7+ planes in the description. I will argue that a p
roper incorporation of O7+ planes requires a better understanding of the d
uality of F-theory with M-theory on the side of physics\, and tools for de
aling with singular elliptic fibrations on the side of mathematics.\n\nhtt
ps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6260
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6260
END:VEVENT
BEGIN:VEVENT
SUMMARY:Classification of 6d SCFTs and supersymmetric little string theori
es (Tata- Infosys Lecture Series) (Lecture 3)
DTSTART;VALUE=DATE-TIME:20180228T103000Z
DTEND;VALUE=DATE-TIME:20180228T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6261@cern.ch
DESCRIPTION:It is believed that the only interacting non-gravitational sup
ersymmetric UV complete theories in six dimensions are either SCFTs or sup
ersymmetric little string theories. I will discuss some approaches to clas
sify such theories. In one approach\, one attempts to formulate and solve
consistency conditions on the low-energy effective gauge theories arising
on the tensor branch of vacua of these theories. Another approach is based
on studying compactifications of F-theory which admit decoupling limits p
roducing these 6d theories. Such compactifications have been classified un
der the assumption that the base of the compactification manifold does not
carry O7+ planes. I will discuss this classification and preliminary atte
mpts at incorporating O7+ planes in the description. I will argue that a p
roper incorporation of O7+ planes requires a better understanding of the d
uality of F-theory with M-theory on the side of physics\, and tools for de
aling with singular elliptic fibrations on the side of mathematics.\n\nhtt
ps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6261
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6261
END:VEVENT
BEGIN:VEVENT
SUMMARY:Surface operators in supersymmetric gauge theories(The Quantum Spa
cetime Lecture Series)
DTSTART;VALUE=DATE-TIME:20180305T060000Z
DTEND;VALUE=DATE-TIME:20180305T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6266@cern.ch
DESCRIPTION:We study half-BPS surface operators in supersymmetric gauge th
eories in four dimensions following two different approaches. In the first
approach we analyze the chiral ring equations for certain quiver theories
in two dimensions\, coupled to the four dimensional gauge theory of inter
est. The chiral ring equations\, which arise from extremizing a twisted ch
iral superpotential\, are solved as a power series in the infrared scales
of the 2d quiver theories. In the second approach we use equivariant local
ization and obtain the twisted chiral superpotential as a function of the
Coulomb moduli of the four dimensional gauge theory\, and find a perfect m
atch with the results obtained from the chiral ring equations.\n\nhttps://
indico.tifr.res.in/indico/conferenceDisplay.py?confId=6266
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6266
END:VEVENT
BEGIN:VEVENT
SUMMARY:Surface operators in supersymmetric gauge theories(The Quantum Spa
cetime Lecture Series)
DTSTART;VALUE=DATE-TIME:20180307T060000Z
DTEND;VALUE=DATE-TIME:20180307T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6267@cern.ch
DESCRIPTION:We study half-BPS surface operators in supersymmetric gauge th
eories in four dimensions following two different approaches. In the first
approach we analyze the chiral ring equations for certain quiver theories
in two dimensions\, coupled to the four dimensional gauge theory of inter
est. The chiral ring equations\, which arise from extremizing a twisted ch
iral superpotential\, are solved as a power series in the infrared scales
of the 2d quiver theories. In the second approach we use equivariant local
ization and obtain the twisted chiral superpotential as a function of the
Coulomb moduli of the four dimensional gauge theory\, and find a perfect m
atch with the results obtained from the chiral ring equations.\n\nhttps://
indico.tifr.res.in/indico/conferenceDisplay.py?confId=6267
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6267
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum corrections to the universal hypermultiplet metric
DTSTART;VALUE=DATE-TIME:20180308T043000Z
DTEND;VALUE=DATE-TIME:20180308T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6286@cern.ch
DESCRIPTION:Type IIA strings compactified on Calabi--Yau threefolds with H
odge--Betti numbers h^{1\,1} and h^{2\,1} give rise to fields that can be
organised into a gravity multiplet\, a tensor multiplet\, h^{1\,1} vector
multiplets\, and h^{2\,1} hypermultiplets. The tensor multiplet can be dua
lised into a hypermultiplet that is universal. The scalars of the universa
l hypermultiplet classically take values on the coset space SU(2\,1)/U(2)
but the invariant metric receives quantum corrections of both perturbative
as well as nonperturbative nature. In this talk\, we shall review some of
the twistorial techniques that have been used to make progress on the pro
blem of determination of all the corrections\, with a focus on perturbativ
e ones.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6
286
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6286
END:VEVENT
BEGIN:VEVENT
SUMMARY:Classification of 6d SCFTs and supersymmetric little string theori
es (Tata- Infosys Lecture Series) (Lecture 4)
DTSTART;VALUE=DATE-TIME:20180309T090000Z
DTEND;VALUE=DATE-TIME:20180309T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6283@cern.ch
DESCRIPTION:It is believed that the only interacting non-gravitational sup
ersymmetric UV complete theories in six dimensions are either SCFTs or sup
ersymmetric little string theories. I will discuss some approaches to clas
sify such theories. In one approach\, one attempts to formulate and solve
consistency conditions on the low-energy effective gauge theories arising
on the tensor branch of vacua of these theories. Another approach is based
on studying compactifications of F-theory which admit decoupling limits p
roducing these 6d theories. Such compactifications have been classified un
der the assumption that the base of the compactification manifold does not
carry O7+ planes. I will discuss this classification and preliminary atte
mpts at incorporating O7+ planes in the description. I will argue that a p
roper incorporation of O7+ planes requires a better understanding of the d
uality of F-theory with M-theory on the side of physics\, and tools for de
aling with singular elliptic fibrations on the side of mathematics.\n\nhtt
ps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6283
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6283
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent Developments on Gravitational Collapse\, Black Holes and Na
ked Singularities (The Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20180312T060000Z
DTEND;VALUE=DATE-TIME:20180312T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6287@cern.ch
DESCRIPTION:We review and discuss here some of the exciting new insights o
n gravitational collapse endstates\, as obtained by recent works of Pretor
ius\, Lehner\, Santos\, and others. Their relevance to black hole physics
is pointed out. The relation to our earlier work on collapse is mentioned\
, and the theoretical significance as well as the observational directions
opening up on these fundamental issues are indicated.\n\nhttps://indico.t
ifr.res.in/indico/conferenceDisplay.py?confId=6287
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6287
END:VEVENT
BEGIN:VEVENT
SUMMARY:Theory and applications of analytic functions on multiply connecte
d domains
DTSTART;VALUE=DATE-TIME:20180315T043000Z
DTEND;VALUE=DATE-TIME:20180315T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6309@cern.ch
DESCRIPTION:In recent years\, the theory of complex valued analytic functi
ons defined on multiply connected domains has been recognized to have seve
ral applications in applied mathematics. In this talk\, we will review the
theory of Schottky-Klein prime functions and other allied special functio
ns defined on multiply connected circular domains\, and discuss the numeri
cal computation of these special functions. We will also briefly present a
pplications to selected problems in fluid dynamics through conformal mappi
ng methods.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?conf
Id=6309
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6309
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Neumann Boundary for Gravity (The Quantum Spacetime Seminar Seri
es)
DTSTART;VALUE=DATE-TIME:20180319T060000Z
DTEND;VALUE=DATE-TIME:20180319T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6313@cern.ch
DESCRIPTION:It was more than 40 years ago that a general Dirichlet boundar
y term was written down for general relativity by Brown and by Gibbons-Haw
king. But a general Neumann boundary term seems to have never been constru
cted. We will argue that a natural way to do this is to covariantize the N
eumann problem. When one does this\, a Neumann boundary term emerges effor
tlessly. We will discuss a list of closely related ideas that arise natura
lly from Neumann\, some in AdS and some in flat space.\n\nhttps://indico.t
ifr.res.in/indico/conferenceDisplay.py?confId=6313
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6313
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalized Global Symmetry: Theory and Applications (Tata-Infosys
Lecture Series)
DTSTART;VALUE=DATE-TIME:20180326T060000Z
DTEND;VALUE=DATE-TIME:20180326T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6329@cern.ch
DESCRIPTION:Generalized concepts of symmetry are useful tools for constrai
ning the dynamics of quantum field theories. In these talks I will revie
w the notion of higher-form global symmetry and explain some of the ways i
n which these generalized concepts of symmetry interplay with ordinary glo
bal symmetry. I will also apply these ideas to several concrete QFTs.\n\n
https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6329
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6329
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalized Global Symmetry: Theory and Applications (Tata-Infosys
Lecture Series)
DTSTART;VALUE=DATE-TIME:20180327T043000Z
DTEND;VALUE=DATE-TIME:20180327T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6330@cern.ch
DESCRIPTION:Generalized concepts of symmetry are useful tools for constrai
ning the dynamics of quantum field theories. In these talks I will revie
w the notion of higher-form global symmetry and explain some of the ways i
n which these generalized concepts of symmetry interplay with ordinary glo
bal symmetry. I will also apply these ideas to several concrete QFTs.\n\n
https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6330
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6330
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalized Global Symmetry: Theory and Applications (Tata-Infosys
Lecture Series)
DTSTART;VALUE=DATE-TIME:20180328T043000Z
DTEND;VALUE=DATE-TIME:20180328T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6331@cern.ch
DESCRIPTION:Generalized concepts of symmetry are useful tools for constrai
ning the dynamics of quantum field theories. In these talks I will revie
w the notion of higher-form global symmetry and explain some of the ways i
n which these generalized concepts of symmetry interplay with ordinary glo
bal symmetry. I will also apply these ideas to several concrete QFTs.\n\n
https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6331
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6331
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vector space of conformal field theories (The Quantum Spacetime Se
minar)
DTSTART;VALUE=DATE-TIME:20180402T060000Z
DTEND;VALUE=DATE-TIME:20180402T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6341@cern.ch
DESCRIPTION:We reformulate the question of consistency of a CFT using cons
traints on an alternative set of conformal data. These data consist of set
of n-point functions of a specific scalar operator. Using this formulatio
n we show that the set of (not necessarily unitary) CFTs with an abelian s
ymmetry forms a vector space over complex numbers.\n\nhttps://indico.tifr.
res.in/indico/conferenceDisplay.py?confId=6341
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6341
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emergence of integrable models in external potentials: Duality\, S
olitons and Field theory. (The Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20180409T060000Z
DTEND;VALUE=DATE-TIME:20180409T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6358@cern.ch
DESCRIPTION:I will discuss the Calogero family of models which remarkably
remain integrable even in external quartic\, trigonometric and hyperbolic
potentials [1]. I will derive its dual form and corresponding soliton solu
tions for finite dimensional systems. The property of duality is exploited
to restrict the space of initial conditions which yield to soliton soluti
ons. I will then give a collective field formulation of these models and d
erive the corresponding soliton solutions in terms of meromorphic fields.
I will also present some very preliminary results on the elliptic case. \n
\n[1] M. Kulkarni\, A. P. Polychronakos\, J. Phys. A: Math. Theor. 50 4552
02 (2017)\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId
=6358
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6358
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Critique of the Fuzzball Program
DTSTART;VALUE=DATE-TIME:20180411T060000Z
DTEND;VALUE=DATE-TIME:20180411T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6364@cern.ch
DESCRIPTION:We explore the viability of fuzzballs as candidate microstate
geometries for the black hole\, and their possible role in resolutions of
the information paradox. We argue that if fuzzballs provide a description
of black-hole microstates\, then the typical fuzzball microstate can only
differ significantly from the conventional black-hole geometry at a Planc
k-scale distance from the horizon. However\, precisely in this region quan
tum fluctuations in the fuzzball geometry become large and the fuzzball ge
ometry becomes unreliable. We verify these expectations through a detailed
calculation of quantum expectation values and quantum fluctuations in the
two-charge fuzzball geometries. We then examine some of the solutions dis
covered in arXiv:1607.03908. We show\, based on a calculation of a probe t
wo-point function in this background\, that these solutions\, and others i
n their class\, violate robust expectations about the gap in energies betw
een successive energy eigenstates\, and differ too much from the convent
ional black-hole to represent viable microstates. We conclude that while
fuzzballs are interesting star-like solutions in string theory\, they do n
ot appear to be relevant for resolving the information paradox\, and canno
t be used to make valid inferences about black-hole interiors.\n\nhttps://
indico.tifr.res.in/indico/conferenceDisplay.py?confId=6364
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6364
END:VEVENT
BEGIN:VEVENT
SUMMARY:New multiplets in N=2 conformal supergravity. (The Quantum Spaceti
me Seminar Series)
DTSTART;VALUE=DATE-TIME:20180416T060000Z
DTEND;VALUE=DATE-TIME:20180416T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6372@cern.ch
DESCRIPTION:Conformal supergravity plays an important role in the off-shel
l construction of the physical Poincare supergravity by employing a set of
procedures\, which are collectively referred to as “superconformal mult
iplet calculus”. An important ingredient in the whole procedure is the k
nowledge of various multiplets\, which are basically irreducible represent
ations of the underlying superconformal algebra. One of such multiplets is
the Weyl multiplet\, which contains the graviton and its superpartner\, a
nd various auxiliary fields necessary to complete the field representation
. In five and six dimensions\, it has been seen that there exists two diff
erent versions of Weyl multiplet in the minimal supergravity\, which diffe
rs in the auxiliary field contents. The version that contains a scalar fie
ld of Weyl weight +1 is referred to as the dilaton Weyl multiplet and the
other version is referred to as the standard Weyl multiplet. In four dimen
sional N=2 supergravity\, so far only the standard version of the Weyl mul
tiplet was known. This is the version that is related to the standard vers
ion in five and six dimensional minimal supergravity via dimensional reduc
tion. However\, the general arguments of dimensional reduction also sugges
t that the dilaton version of the Weyl multiplet should exist in four dime
nsional N=2 supergravity. We will explicitly show the construction of this
multiplet in four dimensions along with its complete supersymmetry transf
ormation laws. If time permits\, we will also discuss the construction of
a different matter multiplet in four dimensional N=2 supergravity that has
24+24 components and contains a real scalar field\, which we refer to as
the “real scalar multiplet”. This was a byproduct of our attempt to co
nstruct the above mentioned dilaton Weyl multiplet using a different appro
ach. We found that our multiplet is actually a curved space generalization
of the multiplet introduced by Howe et al in 1983 in their attempt to und
erstand off-shell version of the hypermultiplet. We will also discuss the
embedding of the 8+8 component N=2 tensor multiplet in the real scalar mul
tiplet by appropriately constraining the real scalar multiplet. We will en
d with some future directions.\n\nhttps://indico.tifr.res.in/indico/confer
enceDisplay.py?confId=6372
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6372
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum information measures for restricted sets of observables
DTSTART;VALUE=DATE-TIME:20180419T060000Z
DTEND;VALUE=DATE-TIME:20180419T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6384@cern.ch
DESCRIPTION:We study measures of quantum information when the space spanne
d by the set of accessible observables is not closed under products\, i.e.
\, we consider systems where an observer may be able to measure the expect
ation values of two operators\, O_1 and O_2\, but may not have access to O
_1 O_2. This problem is relevant for the study of localized quantum inform
ation in gravity since the set of approximately-local operators in a regio
n may not be closed under arbitrary products. While we cannot naturally as
sociate a density matrix with a state in this setting\, it is still possib
le to define a modular operator for a state\, and distinguish between two
states using a relative modular operator. These operators are defined on a
little Hilbert space\, which parameterizes small deformations of the syst
em away from its original state\, and they do not depend on the structure
of the full Hilbert space of the theory. We extract a class of relative-en
tropy-like quantities from the spectrum of these operators that measure th
e distance between states\, are monotonic under contractions of the set of
available observables\, and vanish only when the states are equal. Conseq
uently\, these distance-measures can be used to define measures of biparti
te and multipartite entanglement. We describe applications of our measures
to coarse-grained and fine-grained subregion dualities in AdS/CFT and pro
vide a few sample calculations to illustrate our formalism.\n\nhttps://ind
ico.tifr.res.in/indico/conferenceDisplay.py?confId=6384
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6384
END:VEVENT
BEGIN:VEVENT
SUMMARY:The paper is 1804.00491\, Eternal Traversable Wormhole by Maldacen
a and Qi.
DTSTART;VALUE=DATE-TIME:20180419T043000Z
DTEND;VALUE=DATE-TIME:20180419T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6393@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
6393
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6393
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tensor Models in d Dimensions (The Quantum Spacetime Seminar Serie
s)
DTSTART;VALUE=DATE-TIME:20180423T060000Z
DTEND;VALUE=DATE-TIME:20180423T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6400@cern.ch
DESCRIPTION:Tensor models define a new large N limit dominated by melonic
diagrams. While it seems unlikely that theories with melonic dominance mak
e sense in dimensions greater than 1\, it seems important to confirm this
by carefully\nexploring the range of possibilities for melonic CFT’s\, a
nd their relationships to simpler large N theories based on vector or matr
ix degrees of freedom. In this context we will review some of the work on
fermionic and bosonic tensor models in d dimensions over the last year. On
e positive outcome of these explorations is that it appears possible to st
udy fermionic tensor models in 1 dimension at finite N via an epsilon expa
nsion\, starting\nfrom 2-є dimensions.\n\nhttps://indico.tifr.res.in/indi
co/conferenceDisplay.py?confId=6400
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6400
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constraints on Quantum Gravity (The Quantum Spacetime Seminar Seri
es)
DTSTART;VALUE=DATE-TIME:20180427T060000Z
DTEND;VALUE=DATE-TIME:20180427T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6407@cern.ch
DESCRIPTION:Given an effective theory of gravity\, how can one judge wheth
er it is realized as a low energy approximation to a consistent quantum th
eory with ultra-violet completion\, such as string theory? Swampland condi
tions delineate constraints on low energy effective theories of quantum gr
avity. I will discuss two of such constraints : constraints on symmetry an
d weak gravity conjectures. I will give a proof of the former in the conte
xt of the AdS/CFT correspondence and provide evidences for the latter.\n\n
https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6407
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6407
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hidden Symmetries of Scattering Amplitudes in Gauge Theories and G
ravity (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20180507T060000Z
DTEND;VALUE=DATE-TIME:20180507T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6425@cern.ch
DESCRIPTION:In this talk we discuss two instances of hidden symmetries in
four- dimensional scattering amplitudes. Firstly\, we motivate how to obta
in simple 4d integrable field theories as limits of planar twisted N=4 sup
er Yang- Mills theory. Amplitudes in these new theories are in one-to-one
correspondence with Zamolodchikov's fishnet Feynman graphs and generalizat
ions thereof. Their relation to the planar AdS/CFT duality implies that la
rge families of mostly unsolved Feynman integrals inherit a conformal Yang
ian symmetry. We then show that also tree-level scattering in ordinary Ein
stein gravity possesses a hidden conformal Lie algebra symmetry. The inspi
ration for the latter finding originates in soft limits of string theory s
cattering amplitudes. Curiously\, our formulation of this symmetry relies
on a manifestly permutation symmetric form of the graviton amplitude.\n\nh
ttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6425
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6425
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yangian Symmetry: From Two to Four Dimensions (Tata Infosys Lectur
e Series) (Part I)
DTSTART;VALUE=DATE-TIME:20180508T060000Z
DTEND;VALUE=DATE-TIME:20180508T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6429@cern.ch
DESCRIPTION:In these lectures we introduce Drinfeld's Yangian algebra and
discuss some of its applications in physics. Starting from its origins in
two-dimensional models\, we explain the role of the Yangian in the context
of quantum groups and the Yang-Baxter equation. Finally\, we illustrate h
ow the Yangian finds its way into the AdS/CFT duality and four-dimensional
N=4 super Yang-Mills theory.\n\nhttps://indico.tifr.res.in/indico/confere
nceDisplay.py?confId=6429
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6429
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yangian Symmetry: From Two to Four Dimensions (Tata Infosys Lectur
e Series) (Part II)
DTSTART;VALUE=DATE-TIME:20180509T060000Z
DTEND;VALUE=DATE-TIME:20180509T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6431@cern.ch
DESCRIPTION:In these lectures we introduce Drinfeld's Yangian algebra and
discuss some of its applications in physics. Starting from its origins in
two-dimensional models\, we explain the role of the Yangian in the context
of quantum groups and the Yang-Baxter equation. Finally\, we illustrate h
ow the Yangian finds its way into the AdS/CFT duality and four-dimensional
N=4 super Yang-Mills theory.\n\nhttps://indico.tifr.res.in/indico/confere
nceDisplay.py?confId=6431
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6431
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yangian Symmetry: From Two to Four Dimensions (Tata Infosys Lectur
e Series) (Part III)
DTSTART;VALUE=DATE-TIME:20180510T060000Z
DTEND;VALUE=DATE-TIME:20180510T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6434@cern.ch
DESCRIPTION:In these lectures we introduce Drinfeld's Yangian algebra and
discuss some of its applications in physics. Starting from its origins in
two-dimensional models\, we explain the role of the Yangian in the context
of quantum groups and the Yang-Baxter equation. Finally\, we illustrate h
ow the Yangian finds its way into the AdS/CFT duality and four-dimensional
N=4 super Yang-Mills theory.\n\nhttps://indico.tifr.res.in/indico/confere
nceDisplay.py?confId=6434
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6434
END:VEVENT
BEGIN:VEVENT
SUMMARY:TOWARDS A HOLOGRAPHIC DICTIONARY FOR THE SYK MODEL (Quantum Spacet
ime Seminar)
DTSTART;VALUE=DATE-TIME:20180724T060000Z
DTEND;VALUE=DATE-TIME:20180724T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6514@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
6514
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6514
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scalar Asymptotic Charges from Dual Large Gauge Transformations
DTSTART;VALUE=DATE-TIME:20180727T060000Z
DTEND;VALUE=DATE-TIME:20180727T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6531@cern.ch
DESCRIPTION:We show that\, in four dimensions\, almost all the soft charge
s that canonically generate the scalar soft theorem are large gauge ransfo
rmations of a dual two-form gauge field. The dual picture also resolves an
apparent paradox where the charges were not symmetries of the scalar fiel
d theory. However\, the dual picture introduces two new puzzles: it turns
out that the soft charges have very unexpected Possion brackets with the f
ields\, and that the soft charge that is constant on the sphere\, and only
that one\, doesn’t always have a dual gauge transformation interpretati
on. We find analogs of these two properties in the Kramers-Wannier duality
on a finite lattice\, indicating that the scalar theory has new edge mode
s at infinity that canonically commutes with all the bulk degrees of freed
om.(Work in progress with Miguel Campiglia\, Florian Hopfmueller and Laure
nt Freidel.)\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?con
fId=6531
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6531
END:VEVENT
BEGIN:VEVENT
SUMMARY:Aretakis Instability (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20180806T060000Z
DTEND;VALUE=DATE-TIME:20180806T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6546@cern.ch
DESCRIPTION:In this talk\, I will discuss the subject of the instability o
f extremal black holes. One of the topics I will focus on is the decay of
scalar perturbation on and outside the horizon of an extremal Reissner-Nor
dstrom black hole\, and the importance of AdS2 physics in such an analysis
.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6546
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6546
END:VEVENT
BEGIN:VEVENT
SUMMARY:Classical Limit of Soft Graviton Theorem (Quantum Spacetime Semina
r Series)
DTSTART;VALUE=DATE-TIME:20180813T060000Z
DTEND;VALUE=DATE-TIME:20180813T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6570@cern.ch
DESCRIPTION:In this talk we will show how Soft Graviton Theorem in Quantum
Gravity can be used for analysing low frequency gravitational radiation i
n a class of classical scattering processes. In Four dimensional this ana
lysis yields an interesting observable effect. Namely\, a late time compon
ent in Gravitational field that falls off as inverse power of time\, whi
ch can be interpreted as a tail term to the Linear Memory effect.\n\nhttps
://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6570
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6570
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entanglement structure of a state on multi-torus boundary (Quantum
Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20180820T060000Z
DTEND;VALUE=DATE-TIME:20180820T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6576@cern.ch
DESCRIPTION:We will study the entanglement structure of a particular quant
um state\, called link state\, which is prepared by performing the Chern-S
imons path integral on a 3 dimensional manifold whose boundary consists of
multiple copies of torus linked with each other. The path integral on suc
h a manifold gives a Hilbert space which is tensor product of Hilbert spac
es associated with each torus boundary. The link state lives in this total
Hilbert space and tracing out the sub Hilbert spaces associated with some
of the torus boundaries gives an entanglement structure to the link state
. We will discuss the features of this entanglement structure and interest
ing future projects which can be done in this direction.\n\nhttps://indico
.tifr.res.in/indico/conferenceDisplay.py?confId=6576
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6576
END:VEVENT
BEGIN:VEVENT
SUMMARY:The large D Membrane Paradigm For Einstein-Gauss-Bonnet Gravity
DTSTART;VALUE=DATE-TIME:20180820T090000Z
DTEND;VALUE=DATE-TIME:20180820T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6585@cern.ch
DESCRIPTION:We find the equations of motion of membranes dual to the black
holes in Einstein-Gauss-Bonnet (EGB) gravity to leading order in 1/D in t
he large D regime. We also find the metric solutions to the EGB equations
to first sub leading order in 1/D in terms of membrane variables. We propo
se a world volume stress tensor for the membrane whose conservation equati
ons are equivalent to the leading order membrane equations. We also work o
ut the light quasi-normal mode spectrum of static black holes in EGB gravi
ty from the linearised fluctuations of static\, round membranes. All our r
esults are worked out to linear order in the Gauss-Bonnet parameter.\n\nht
tps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6585
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6585
END:VEVENT
BEGIN:VEVENT
SUMMARY:Magnetohydrodynamics and one-form superfluidity
DTSTART;VALUE=DATE-TIME:20180821T090000Z
DTEND;VALUE=DATE-TIME:20180821T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6586@cern.ch
DESCRIPTION:Magnetohydrodynamics (MHD) describes the coupling of hydrodyna
mics to dynamical electromagnetic fields. In the conventional form of MHD\
, one introduces a dynamical gauge field and the respective Maxwell's equa
tions by hand. In this talk\, we will explore an alternate view of MHD pur
ely based on symmetries without any assumption about the microscopic field
content. We will argue that MHD is described by a novel theory of superfl
uidity\, with a partially broken one-form symmetry. We will also discuss t
he implications of this broken symmetry for constructing hydrostatic parti
tion functions describing MHD. The talk is based on https://arxiv.org/abs/
1808.01939.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?conf
Id=6586
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6586
END:VEVENT
BEGIN:VEVENT
SUMMARY:"Complex Langevin analysis of the spontaneous rotational symmetry
breaking in the dimensionally-reduced super-Yang-Mills models"
DTSTART;VALUE=DATE-TIME:20180821T050000Z
DTEND;VALUE=DATE-TIME:20180821T060000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6587@cern.ch
DESCRIPTION:It has been speculated that the spontaneous symmetry breakdown
(SSB) of the SO(D) rotational symmetry occurs in the matrix models obtain
ed by the dimensional reduction of the super Yang-Mills (SYM)theory in D=6
\,10 dimensions\, with the indices contracted by the Euclidean metric. The
D=10 case corresponds to the IIB matrix model\, which has been proposed a
s a nonperturbative definition of superstring theory\, and the SSB of SO(D
) corresponds to the dynamical generation of the spacetime in our universe
. In the D=6\,10 cases\, Monte Carlo calculations suffer from a severe com
plex action problem due to the complex phase of the fermionic partition fu
nction. In this work\, we apply the Complex Langevin Method (CLM) to these
matrix \nmodels in order to study the SSB of the SO(D).\n\nhttps://indico
.tifr.res.in/indico/conferenceDisplay.py?confId=6587
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6587
END:VEVENT
BEGIN:VEVENT
SUMMARY:Soft Theorems and Asymptotic Symmetries in Effective Field Theorie
s (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20180827T060000Z
DTEND;VALUE=DATE-TIME:20180827T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6593@cern.ch
DESCRIPTION:We study soft theorems in effective field theories. Unlike its
leading counterpart\, the subleading soft photon theorem is sensitive to
higher derivative interactions in the EFT and is\, generically\, not unive
rsal. We show that despite the non- universality\, they continue to have a
n interpretation as a Ward identity for a certain class of divergent large
gauge transformations. This provides evidence for the conjecture that all
soft theorems in quantum field theory can be recast into a statement of a
symptotic symmetries of the S-matrix.\n\nhttps://indico.tifr.res.in/indico
/conferenceDisplay.py?confId=6593
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6593
END:VEVENT
BEGIN:VEVENT
SUMMARY:Probing Out-of-Time-Order Correlators
DTSTART;VALUE=DATE-TIME:20180906T043000Z
DTEND;VALUE=DATE-TIME:20180906T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6610@cern.ch
DESCRIPTION:In this talk I will present a method to probe the Out-of-Time-
Order Correlators (OTOCs) of a general system by coupling it to a harmonic
oscillator probe. When the system's degrees of freedom are traced out\,
the OTOCs imprint themselves on the generalized influence functional of th
e oscillator. This generalized influence functional leads to a local effec
tive action for the probe whose couplings encode OTOCs of the system. I wi
ll focus on the structural features of this effective action and the const
raints on the couplings from microscopic unitarity. I will also discuss th
e additional constraints imposed on the effective couplings of the probe w
hen the system is in a thermal state. Finally\, I will describe a concrete
model where all these analyses are applied to obtain an effective theory
of the probe.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?co
nfId=6610
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6610
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kite diagram through Symmetries of Feynman Integrals (Quantum Spac
etime Seminar Series)
DTSTART;VALUE=DATE-TIME:20180910T060000Z
DTEND;VALUE=DATE-TIME:20180910T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6614@cern.ch
DESCRIPTION:The Symmetries of Feynman Integrals (SFI) is a method for eval
uating Feynman Integrals which exposes a novel continuous group associated
with the diagram which depends only on its topology and acts on its param
eters. Using this method we study the kite diagram\, a two-loop diagram wi
th two external legs\, with arbitrary masses and spacetime dimension. Gene
rically\, this method reduces a Feynman integral into a line integral over
simpler diagrams. We identify a locus in parameter space where the integr
al further reduces to a mere linear combination of simpler diagrams\, ther
eby maximally generalizing the known massless case.\n\nhttps://indico.tifr
.res.in/indico/conferenceDisplay.py?confId=6614
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6614
END:VEVENT
BEGIN:VEVENT
SUMMARY:BMS Field Theories and Modular Invariance (Quantum Spacetime Semin
ar Series)
DTSTART;VALUE=DATE-TIME:20180917T060000Z
DTEND;VALUE=DATE-TIME:20180917T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6626@cern.ch
DESCRIPTION:In this talk\, we will consider 2d field theories invariant un
der the BMS algebra\, putatively dual to 3d Minkowski spacetimes and discu
ss the notion of a version of modular invariance in these theories. We wil
l revisit the derivation of the BMS-Cardy formula and its reproduction of
the entropy of cosmological horizons in flat space. We would then discuss
in detail the construction of characters for these 2d field theories.\n\nh
ttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6626
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6626
END:VEVENT
BEGIN:VEVENT
SUMMARY:Null states and soft theorems (THE QUANTUM SPACETIME SEMINAR SERIE
S)
DTSTART;VALUE=DATE-TIME:20180924T060000Z
DTEND;VALUE=DATE-TIME:20180924T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6639@cern.ch
DESCRIPTION:Recently a beautiful relation between soft theorem and Ward id
entity for infinite dimensional asymptotic symmetries. We show that at lea
st in higher than four dimensions this relation implies the existence of n
ull states built out of soft photon and gravitons operators. By null state
we mean some operator which decouples from the S-matrix. This gives non-t
rivial constraints on S-matrices involving soft-particles.\n\nhttps://indi
co.tifr.res.in/indico/conferenceDisplay.py?confId=6639
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6639
END:VEVENT
BEGIN:VEVENT
SUMMARY:Some revelations of rebellious and queer nature of NAdS2 (THE QUAN
TUM SPACETIME SEMINAR SERIES)
DTSTART;VALUE=DATE-TIME:20181001T060000Z
DTEND;VALUE=DATE-TIME:20181001T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6647@cern.ch
DESCRIPTION:NAdS2 holography has recently been studied extensively as not
only it provides a gravity analogue of maximally chaotic quantum systems b
ut also because it can potentially answer some fundamental questions in qu
antum gravity. For both purposes\, it is necessary to understand time- dep
endent behavior. We explicitly construct exact time-dependent classical NA
dS2 solutions involving sources of irrelevant operators with dimensions be
tween 1 and 3/2. We also construct semi-holographic models involving back-
reacted source and with total conserved energy. In both cases\, we find th
at NAdS2 holographic systems can behave in totally different ways compared
to its higher dimensional analogues. Particularly\, even in the classical
bulk approximation\, reversible transfer of energy from bulk to boundary
source is possible. We can find the final steady state solution in a large
range of semi-holographic coupling. We also argue that even in the classi
cal bulk approximation we will need need to incorporate AdS2 fragmentation
to make sense of the most general scenario. Our semi-holographic model ca
n have applications in understanding of behavior of di-quarks in quark-glu
on plasma.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confI
d=6647
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6647
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the Polyakov-Mellin bootstrap (Quantum Spacetime Seminar Series
)
DTSTART;VALUE=DATE-TIME:20181008T060000Z
DTEND;VALUE=DATE-TIME:20181008T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6654@cern.ch
DESCRIPTION:This talk will elaborate on the manifestly crossing symmetric
framework for studying the conformal bootstrap for a CFTd . This employs W
itten diagrams of an auxiliary AdS d+1 . We will discuss how both exchange
and contact Witten diagrams are necessary and also give simple\, explicit
representations/parametrisations of these in Mellin space. We will also s
how how explicit expressions for the crossing kernel for exchange Witten d
iagrams (i.e. the decomposition of a t-channel amplitude in s-channel part
ial waves) can be obtained in Mellin space. They are closely related to th
e generalised 6j-symbols and given in terms of 7F6 hypergeometric function
s.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6654
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6654
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quasiparticle lifetime in a finite conductor and the problem of ma
ny-body localization (Quantum Spacetime Series Seminar)
DTSTART;VALUE=DATE-TIME:20181015T060000Z
DTEND;VALUE=DATE-TIME:20181015T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6667@cern.ch
DESCRIPTION:A quasiparticle in a Landau Fermi liquid has a lifetime that v
aries inversely as the square of its energy. This understanding is ultimat
ely based on a Fermi Golden Rule argument: the decay rate is proportional
to the square of the matrix element for Coulomb interaction of the fermion
s as well as the phase space available to the final products of the decay
process. In a finite conductor\, the single-particle energy levels are dis
crete and the Fermi Golden Rule-based understanding of the quasiparticle l
ifetime is no longer valid when their energies are comparable to the mean
level spacing\, delta. Indeed\, in this regime\, the interparticle interac
tions merely shift these energy levels and the excitation lifetime is infi
nite. A careful analysis shows that the quasiparticle lifetime diverges be
low an energy scale that is parametrically larger than delta. It is instru
ctive to look at this problem from a different perspective. In principle\,
one could diagonalize the interacting many-particle system and the system
\, prepared in any of the eigenstates\, would persist forever in that stat
e. A quasiparticle can always be expressed as a linear superposition of th
e exact many-body eigenstates. If this superposition involves many-body ei
genstates whose energy spread exceeds the quasiparticle energy\, then the
excitation "decays" on a time scale that is inversely proportional to the
energy spread. If the superposition involves a small number of many-body e
igenstates\, then the excitation does not decay. I will show that this tra
nsition is\, in fact\, a many-body localization transition\, i.e.\, an And
erson localization transition in the Fock space of many-body states. I wil
l place this analysis in the context of the problem of quasiparticle lifet
ime in the Kitaev model subjected to integrability-breaking perturbations.
\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6667
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6667
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalization group flows in disordered field theories (Quantum
Spacetime Series Seminar) [vis Skype]
DTSTART;VALUE=DATE-TIME:20181022T060000Z
DTEND;VALUE=DATE-TIME:20181022T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6674@cern.ch
DESCRIPTION:We will analyze the renormalization group (RG) flow of field t
heories with quenched disorder\, in which the couplings vary randomly in s
pace. We analyze both classical (Euclidean) disorder and quantum disorder\
, emphasizing general properties rather than specific cases. The RG flow o
f the disorder-averaged theories takes place in the space of their couplin
g constants and also in the space of distributions for the disordered coup
lings\, and the two mix together. We write down a generalization of the Ca
llan-Symanzik equation for the flow of disorder-averaged correlation funct
ions. We find that local operators can mix with the response of the theory
to local changes in the disorder distribution\, and that the generalized
Callan-Symanzik equation mixes the disorder averages of several different
correlation functions. For classical disorder we show that this can lead t
o new types of anomalous dimensions and to logarithmic behavior at fixed p
oints. For quantum disorder we find that the RG flow always generates a re
scaling of time relative to space\, which at a fixed point generically lea
ds to Lifshitz scaling. The dynamical scaling exponent z behaves as an ano
malous dimension and we compute it at leading order in perturbation theory
in the disorder for a general theory. We also find in quantum disorder th
at local operators mix with non-local (in time) operators under the RG\, a
nd that there are critical exponents associated with the disorder distribu
tion that have not previously been discussed.\n\nhttps://indico.tifr.res.i
n/indico/conferenceDisplay.py?confId=6674
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6674
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strings\, Schwarzian\, Maximal Chaos (Quantum Spacetime Series sem
inar)
DTSTART;VALUE=DATE-TIME:20181029T060000Z
DTEND;VALUE=DATE-TIME:20181029T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6698@cern.ch
DESCRIPTION:In this talk\, we will discuss evidence that maximal chaos occ
urs for a generic probe quark-like degree of freedom\, in a strongly coupl
ed large-N theory. We will demonstrate this by extracting an effective Sch
warzian action that describes the low energy physics of a long\, open stri
ng embedded in AdS. We will argue that this maximal chaos is an inherent f
eature of the string worldsheet\, and further present an example where an
intrinsic D- brane horizon\, away from extremality\, yields a similar resu
lt. We will conclude with open questions and possible future investigation
s.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6698
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6698
END:VEVENT
BEGIN:VEVENT
SUMMARY:Aspects of Hecke Symmetry
DTSTART;VALUE=DATE-TIME:20181101T090000Z
DTEND;VALUE=DATE-TIME:20181101T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6709@cern.ch
DESCRIPTION:Motivated by their appearance in supersymmetric gauge and stri
ng theories\, we study the relations governing quasi-automorphic forms ass
ociated to certain discrete subgroups of SL(2\,R) called Hecke groups. The
Eisenstein series associated to a Hecke group H(m) satisfy a set of coupl
ed linear differential equations\, which are natural analogues of the well
-known Ramanujan identities for modular forms of SL(2\,Z). We derive these
dentities by appealing to a correspondence with the generalized Halphen s
ystem. Each Hecke group is then associated to a (hyper-)elliptic curve\, w
hose oefficients are found to be determined by an anomaly equation. The Ra
manujan identities admit a natural geometrical interpretation as a vector
field on the moduli space of this curve. They also allow us to associate a
higher- order non-linear differential equation to each Hecke group. These
equations are higher-order analogues of the well-known Chazy equation\, a
nd we show that they are solved by the quasi-automorphic weight-2 Eisenste
in series associated to H(m) and its Hecke orbits\, thereby generalizing a
result of Takhtajan.\n\nhttps://indico.tifr.res.in/indico/conferenceDispl
ay.py?confId=6709
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6709
END:VEVENT
BEGIN:VEVENT
SUMMARY:Second law of black-hole thermodynamics in higher derivative theor
ies of gravity (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20181105T060000Z
DTEND;VALUE=DATE-TIME:20181105T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6715@cern.ch
DESCRIPTION:In this talk we will discuss the construction of an entropy fu
nction for dynamical black holes in a specific higher derivative theory of
gravity\, namely Lovelock theories. As is known\, in classical general re
lativity described by Einstein-Hilbert gravity\, black holes behave as the
rmodynamic objects. The first law of black hole mechanics extends to high
er derivative theories via the Noether charge construction of Wald. In ord
er to extend the second law (which in Einstein-Hilbert theory owes to Hawk
ing's area theorem) to higher derivative theories one needs a notion of en
tropy for dynamical black holes beyond the Noether charge construction. We
will discuss one such possible extension for the Lovelock theories of gra
vity\, treating the higher derivative terms as perturbations to Einstein's
gravity.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId
=6715
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6715
END:VEVENT
BEGIN:VEVENT
SUMMARY:Applications of moonshine in string compactifications and black h
oles (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20181112T060000Z
DTEND;VALUE=DATE-TIME:20181112T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6720@cern.ch
DESCRIPTION:The discovery of Mathieu moonshine in the elliptic genus of K3
allows the construction of twisted ellipitc genera to every conjugacy cla
ss of the Mathieu group M23. We show how these twisted elliptic genera p
lay an important role in both N=2 and N=4 string compactifictions. In N=2
string compactifications they point to the existence of a class of Calabi-
Yau geometries. In N=4 compactifications they are inputs to degeneracies o
f 1/4 BPS states\, which at large values of charges are black holes. We th
en study properties of these states at small values of charges which provi
de insight to their geometric description as black holes.\n\nhttps://indi
co.tifr.res.in/indico/conferenceDisplay.py?confId=6720
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6720
END:VEVENT
BEGIN:VEVENT
SUMMARY:JTbar deformed CFT_2 and string theory (Quantum Spacetime Seminar
Series) (Skype Talk)
DTSTART;VALUE=DATE-TIME:20181119T060000Z
DTEND;VALUE=DATE-TIME:20181119T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6736@cern.ch
DESCRIPTION:I'm going to talk about two dimensional conformal field theory
with a left- moving conserved current J\, perturbed by an irrelevant\, Lo
rentz symmetry breaking operator with the quantum numbers of JTbar\, using
a combination of field and string theoretic techniques. I'll show that t
he spectrum of the theory has some interesting features\, which may shed l
ight on systems of interest for holography and black hole physics.\n\nhttp
s://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6736
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6736
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modular bootstrap with some applications to thermalization (Quan
tum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20181126T060000Z
DTEND;VALUE=DATE-TIME:20181126T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6747@cern.ch
DESCRIPTION:In this talk I will review some recent developments in bootstr
apping operator product expansion (OPE) coefficients of two dimensional co
nformal theories. We will derive certain asymptotic formulae for the OPE c
oefficients relevant for the eigenstate thermalization hypothesis. We shal
l also briefly discuss the deviations from thermality at the level of redu
ced density matrices. The third part of the talk will focus on non-local p
robes of thermality. Finally we shall investigate other constraints on the
conformal blocks coming from crossing symmetry that reproduces features o
f the black hole S-matrix. If there is time\, I will discuss some recent p
rogress on generalized Gibbs ensembles.\n\nhttps://indico.tifr.res.in/indi
co/conferenceDisplay.py?confId=6747
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6747
END:VEVENT
BEGIN:VEVENT
SUMMARY:Comapactifications of minimal 6d SCFTs to four dimensions (Tata-In
fosys Lecture Series) (Lecture 1)
DTSTART;VALUE=DATE-TIME:20181203T060000Z
DTEND;VALUE=DATE-TIME:20181203T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6761@cern.ch
DESCRIPTION:We study compactifications on Riemann surfaces with punctures
of N=(1\,0) 6d SCFTs with a one dimensional tensor branch and no continuou
s global symmetries. The effective description of such models on the tenso
r branch is in terms of pure gauge theories with decoupled tensor. For gen
eric Riemann surfaces\, the resulting theories in four dimensions are expe
cted to have N=1 supersymmetry. We compute the anomalies expected from the
resulting 4d theories by integrating the anomaly polynomial of the 6d the
ory on the Riemann surface. For the cases with 6d gauge models with gauge
groups SU(3) and SO(8) we further propose a field theory construction for
the resulting 4d theories. For the 6d SU(3) theory\, we argue that the the
ories in four dimensions are quivers with SU(3) gauge nodes and free chira
l fields. The theories one obtains from the 6d SO(8) gauge theory are quiv
ers with SU(4) gauge groups and chiral fields with R charge a half. In the
last case the theories constructed for general Riemann surfaces involve g
auging of symmetries appearing at strong coupling. The conformal manifolds
of the models are constructed from gauge couplings and baryonic superpote
ntials. We support our conjectures by matching the dimensions of the confo
rmal manifolds with complex structure moduli of the Riemann surfaces\, mat
ching anomalies between six and four dimensions\, and checking the dualiti
es related to different pair of pants decompositions of the surfaces. As a
simple application of the results we conjecture that SU(3) gauge theory w
ith nine flavors in four dimensions has a duality group acting on the sev
en dimensional conformal manifold which is the mapping class group of sphe
re with ten marked points.\n\nhttps://indico.tifr.res.in/indico/conference
Display.py?confId=6761
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6761
END:VEVENT
BEGIN:VEVENT
SUMMARY:Comapactifications of minimal 6d SCFTs to four dimensions (Tata-In
fosys Lecture Series) (Lecture 2)
DTSTART;VALUE=DATE-TIME:20181204T060000Z
DTEND;VALUE=DATE-TIME:20181204T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6762@cern.ch
DESCRIPTION:We study compactifications on Riemann surfaces with punctures
of N=(1\,0) 6d SCFTs with a one dimensional tensor branch and no continuou
s global symmetries. The effective description of such models on the tenso
r branch is in terms of pure gauge theories with decoupled tensor. For gen
eric Riemann surfaces\, the resulting theories in four dimensions are expe
cted to have N=1 supersymmetry. We compute the anomalies expected from the
resulting 4d theories by integrating the anomaly polynomial of the 6d the
ory on the Riemann surface. For the cases with 6d gauge models with gauge
groups SU(3) and SO(8) we further propose a field theory construction for
the resulting 4d theories. For the 6d SU(3) theory\, we argue that the the
ories in four dimensions are quivers with SU(3) gauge nodes and free chira
l fields. The theories one obtains from the 6d SO(8) gauge theory are quiv
ers with SU(4) gauge groups and chiral fields with R charge a half. In the
last case the theories constructed for general Riemann surfaces involve g
auging of symmetries appearing at strong coupling. The conformal manifolds
of the models are constructed from gauge couplings and baryonic superpote
ntials. We support our conjectures by matching the dimensions of the confo
rmal manifolds with complex structure moduli of the Riemann surfaces\, mat
ching anomalies between six and four dimensions\, and checking the dualiti
es related to different pair of pants decompositions of the surfaces. As a
simple application of the results we conjecture that SU(3) gauge theory w
ith nine flavors in four dimensions has a duality group acting on the sev
en dimensional conformal manifold which is the mapping class group of sphe
re with ten marked points.\n\nhttps://indico.tifr.res.in/indico/conference
Display.py?confId=6762
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6762
END:VEVENT
BEGIN:VEVENT
SUMMARY:Comapactifications of minimal 6d SCFTs to four dimensions (Tata-In
fosys Lecture Series) (Lecture 3)
DTSTART;VALUE=DATE-TIME:20181205T093000Z
DTEND;VALUE=DATE-TIME:20181205T103000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6763@cern.ch
DESCRIPTION:We study compactifications on Riemann surfaces with punctures
of N=(1\,0) 6d SCFTs with a one dimensional tensor branch and no continuou
s global symmetries. The effective description of such models on the tenso
r branch is in terms of pure gauge theories with decoupled tensor. For gen
eric Riemann surfaces\, the resulting theories in four dimensions are expe
cted to have N=1 supersymmetry. We compute the anomalies expected from the
resulting 4d theories by integrating the anomaly polynomial of the 6d the
ory on the Riemann surface. For the cases with 6d gauge models with gauge
groups SU(3) and SO(8) we further propose a field theory construction for
the resulting 4d theories. For the 6d SU(3) theory\, we argue that the the
ories in four dimensions are quivers with SU(3) gauge nodes and free chira
l fields. The theories one obtains from the 6d SO(8) gauge theory are quiv
ers with SU(4) gauge groups and chiral fields with R charge a half. In the
last case the theories constructed for general Riemann surfaces involve g
auging of symmetries appearing at strong coupling. The conformal manifolds
of the models are constructed from gauge couplings and baryonic superpote
ntials. We support our conjectures by matching the dimensions of the confo
rmal manifolds with complex structure moduli of the Riemann surfaces\, mat
ching anomalies between six and four dimensions\, and checking the dualiti
es related to different pair of pants decompositions of the surfaces. As a
simple application of the results we conjecture that SU(3) gauge theory w
ith nine flavors in four dimensions has a duality group acting on the sev
en dimensional conformal manifold which is the mapping class group of sphe
re with ten marked points.\n\nhttps://indico.tifr.res.in/indico/conference
Display.py?confId=6763
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6763
END:VEVENT
BEGIN:VEVENT
SUMMARY:Comapactifications of minimal 6d SCFTs to four dimensions (Tata-In
fosys Lecture Series) (Lecture 4)
DTSTART;VALUE=DATE-TIME:20181207T090000Z
DTEND;VALUE=DATE-TIME:20181207T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6765@cern.ch
DESCRIPTION:We study compactifications on Riemann surfaces with punctures
of N=(1\,0) 6d SCFTs with a one dimensional tensor branch and no continuou
s global symmetries. The effective description of such models on the tenso
r branch is in terms of pure gauge theories with decoupled tensor. For gen
eric Riemann surfaces\, the resulting theories in four dimensions are expe
cted to have N=1 supersymmetry. We compute the anomalies expected from the
resulting 4d theories by integrating the anomaly polynomial of the 6d the
ory on the Riemann surface. For the cases with 6d gauge models with gauge
groups SU(3) and SO(8) we further propose a field theory construction for
the resulting 4d theories. For the 6d SU(3) theory\, we argue that the the
ories in four dimensions are quivers with SU(3) gauge nodes and free chira
l fields. The theories one obtains from the 6d SO(8) gauge theory are quiv
ers with SU(4) gauge groups and chiral fields with R charge a half. In the
last case the theories constructed for general Riemann surfaces involve g
auging of symmetries appearing at strong coupling. The conformal manifolds
of the models are constructed from gauge couplings and baryonic superpote
ntials. We support our conjectures by matching the dimensions of the confo
rmal manifolds with complex structure moduli of the Riemann surfaces\, mat
ching anomalies between six and four dimensions\, and checking the dualiti
es related to different pair of pants decompositions of the surfaces. As a
simple application of the results we conjecture that SU(3) gauge theory w
ith nine flavors in four dimensions has a duality group acting on the sev
en dimensional conformal manifold which is the mapping class group of sphe
re with ten marked points.\n\nhttps://indico.tifr.res.in/indico/conference
Display.py?confId=6765
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6765
END:VEVENT
BEGIN:VEVENT
SUMMARY: An attractor mechanism for nAdS_{2}/nCFT_{1} holo
graphy (Quantum Spacetime Seminar series)
DTSTART;VALUE=DATE-TIME:20181207T063000Z
DTEND;VALUE=DATE-TIME:20181207T073000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6775@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
6775
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6775
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalized hot attractors (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20181214T043000Z
DTEND;VALUE=DATE-TIME:20181214T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6780@cern.ch
DESCRIPTION:Non-extremal black holes such as the astrophysical black holes
we encounter in the sky remain mysterious objects. As solutions to genera
l relativity\, they possess certain invariants. We extend prior investigat
ions of so-called hot attractor black holes to higher dimensions and add a
scalar potential. In addition to the event and Cauchy horizons\, when we
complexify the radial coordinate\, non-extremal black holes generically ha
ve additional horizons. We prove that products of all of the horizon areas
are independent of variations of the asymptotic moduli further generalizi
ng the attractor mechanism for extremal black holes. In gauged supergravit
y\, we find that the product of horizon areas is not necessarily the geome
tric mean of the extremal area. We outline the derivation of horizon invar
iants for stationary backgrounds such as Kerr–Newman.\n\nhttps://indico
.tifr.res.in/indico/conferenceDisplay.py?confId=6780
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6780
END:VEVENT
BEGIN:VEVENT
SUMMARY:A microscopic look at quantum and classical anomalies
DTSTART;VALUE=DATE-TIME:20181221T060000Z
DTEND;VALUE=DATE-TIME:20181221T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6805@cern.ch
DESCRIPTION:I will present a fully non-perturbative\, lattice-based descri
ption of the chiral (ABJ) anomaly of massless Dirac fermions in even space
time dimensions. The origin of the anomaly\, the need for anomaly inflow\,
and the connection with the gravitational anomaly become simple kinematic
facts from this point of view. Along the way\, some additional lessons ab
out fermionic lattice systems will be learned: in particular\, a new “cl
assical” anomaly – baby version of Witten’s SU(2) anomaly – will b
e shown to hold in certain theories.\n\nhttps://indico.tifr.res.in/indico/
conferenceDisplay.py?confId=6805
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6805
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eigenstate thermalization in the Sachdev-Ye-Kitaev model
DTSTART;VALUE=DATE-TIME:20190102T060000Z
DTEND;VALUE=DATE-TIME:20190102T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6822@cern.ch
DESCRIPTION:The eigenstate thermalization hypothesis (ETH) provides an exp
lanation as to how closed unitary quantum systems can exhibit thermal beha
vior in pure states. In this work we examine the Sachdev-Ye-Kitaev model a
s well its IR limit as described by an effective Schwarzian action. We sho
w that\, as expected from evidence found using exact diagonalization\, the
model satisfies ETH. In the Schwarzian limit\, we study a specific class
of states created by heavy operators and find that they only show a weak f
orm of ETH.\n\nBased on arXiv:1707.08013 (with J. Sonner) and work in prog
ress (with P. Nayak and J. Sonner)\n\nhttps://indico.tifr.res.in/indico/co
nferenceDisplay.py?confId=6822
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6822
END:VEVENT
BEGIN:VEVENT
SUMMARY: Quantum gravity from timelike Liouville [Quantum Spacetime Semina
r]
DTSTART;VALUE=DATE-TIME:20190103T060000Z
DTEND;VALUE=DATE-TIME:20190103T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6832@cern.ch
DESCRIPTION:A proper definition of the path integral of quantum gravity ha
s been a long standing puzzle because the conformal factor of the Euclidea
n metric has a wrong-sign kinetic term. We propose a definition of two-di
mensional quantum gravity with cosmological constant using conformal boot
strap for the timelike Liouville theory coupled to supercritical matter.
We prove a no-ghost theorem for the states in the BRST cohomology. We show
that the four point function constructed by gluing the timelike DOZZ th
ree point functions is well-defined and crossing symmetric with the choi
ce of the Ribault-Santachiara contour for the internal momenta but with ex
ternal momenta corresponding to physical states in the BRST cohomology.\n
\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6832
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6832
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bounds on Energy and Transport in Quantum Field Theory (Quantum Sp
acetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20190107T060000Z
DTEND;VALUE=DATE-TIME:20190107T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6835@cern.ch
DESCRIPTION:Local energy density can be negative in QFT\, but unitary QFTs
obey the averaged null energy condition (ANEC). I will show that this con
strains the relaxation to equilibrium in relativistic systems at finite te
mperature\, placing bounds on the viscosity and thermalization length.\n\n
https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6835
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6835
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Bootstrap Approach to Quantum Gravity (Tata Infosys Lecture Se
ries) (Lecture 1)
DTSTART;VALUE=DATE-TIME:20190108T060000Z
DTEND;VALUE=DATE-TIME:20190108T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6836@cern.ch
DESCRIPTION:The bootstrap is a strategy to solve strongly interacting quan
tum field theories\, based on general principles of symmetry and quantum m
echanics. In these lectures\, I will review progress on using bootstrap te
chniques to understand emergent spacetime in quantum gravity.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=6836
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6836
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Bootstrap Approach to Quantum Gravity (Tata Infosys Lecture Se
ries) (Lecture 2)
DTSTART;VALUE=DATE-TIME:20190109T060000Z
DTEND;VALUE=DATE-TIME:20190109T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6839@cern.ch
DESCRIPTION:The bootstrap is a strategy to solve strongly interacting quan
tum field theories\, based on general principles of symmetry and quantum m
echanics. In these lectures\, I will review progress on using bootstrap te
chniques to understand emergent spacetime in quantum gravity.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=6839
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6839
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Bootstrap Approach to Quantum Gravity (Tata Infosys Lecture Se
ries) (Lecture 3)
DTSTART;VALUE=DATE-TIME:20190111T060000Z
DTEND;VALUE=DATE-TIME:20190111T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6840@cern.ch
DESCRIPTION:The bootstrap is a strategy to solve strongly interacting quan
tum field theories\, based on general principles of symmetry and quantum m
echanics. In these lectures\, I will review progress on using bootstrap te
chniques to understand emergent spacetime in quantum gravity.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=6840
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6840
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constraints on CFTs in large dimensions (Quantum Spacetime Seminar
)
DTSTART;VALUE=DATE-TIME:20190114T060000Z
DTEND;VALUE=DATE-TIME:20190114T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6862@cern.ch
DESCRIPTION:I'll constrain the space of CFTs in large dimensions using cro
ssing symmetry and unitarity\, assuming the existence of stress tensor. La
grangian based arguments lead us to suspect that there are no non-trivial
CFTs in dimensions greater than 6. I'll analyze the above constraints star
ting from infinite D\, in 1/D perturbation theory. At leading order I'll s
how that there are no non-trivial CFTs in large D. It is expected that thi
s conclusion persists at the sub-leading order.\n\nhttps://indico.tifr.res
.in/indico/conferenceDisplay.py?confId=6862
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6862
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scattering amplitudes\, bootstrap\, and supersymmetric localizatio
n (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20190121T060000Z
DTEND;VALUE=DATE-TIME:20190121T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6866@cern.ch
DESCRIPTION:In this talk\, I will connect three topics: supersymmetric loc
alization\, bootstrap\, and scattering amplitudes in string theory and M-t
heory. In particular\, I will explain how one can rederive the first few
terms in the small momentum expansion of string theory and M-theory gravit
on scattering from CFT results. I will also explain how our knowledge of
closed string scattering amplitudes and supersymmetric localization can be
combined to give new results for the 4-point function of conformal primar
y operators in 4d N=4 super-Yang-Mills theory and in ABJM theory at strong
coupling.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confI
d=6866
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6866
END:VEVENT
BEGIN:VEVENT
SUMMARY:Solving topological sectors of 3d SCFTs [Tata Infosys Lecture Seri
es]
DTSTART;VALUE=DATE-TIME:20190122T060000Z
DTEND;VALUE=DATE-TIME:20190122T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6868@cern.ch
DESCRIPTION:3d superconformal field theories with N = 4 supersymmetry have
two topological sectors\, one associated with the Higgs branch and one wi
th the Coulomb branch. I will explain how these sectors are defined and I
will describe their properties as well as a method to compute any correla
tion functions in these sectors for 3d N=4 gauge theories with charged mat
ter.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6868
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6868
END:VEVENT
BEGIN:VEVENT
SUMMARY:A 2d/1d holographic duality (Tata-Infosys Lecture Series)
DTSTART;VALUE=DATE-TIME:20190123T043000Z
DTEND;VALUE=DATE-TIME:20190123T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6875@cern.ch
DESCRIPTION:Starting with 3d superconformal theories with N=4 supersymmetr
y that have holographic duals\, I will propose that the 1d topological sec
tors described in the previous lecture have their own 2d bulk duals. I wil
l describe explicitly what these duals are in a few examples.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=6875
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6875
END:VEVENT
BEGIN:VEVENT
SUMMARY:BTZ dynamics and chaos
DTSTART;VALUE=DATE-TIME:20190125T043000Z
DTEND;VALUE=DATE-TIME:20190125T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6878@cern.ch
DESCRIPTION:We find an effective action for gravitational interactions wit
h scalars in AdS3 to first order in GN at the conformal boundary. This act
ion can be understood as an action for the Brown-Henneaux modes and is giv
en by the square-root product of right and left moving Schwarzian derivati
ves for conformal transformations of the boundary. We thus reproduce the r
esult λL ={2π \\over β} for OTOC computed first in arXiv:1412.6087 for
a Schwarzchild black hole in AdS3. Applying the same procedure to rotating
BTZ we find the Lyapunov index to be λL = {2π \\over β+} where β+ =
β(1 − μL)\, with μL = {r_- \\over r_+} the chemical potential for ang
ular momentum. We thus comment on a possible modification to a part of the
proof given in arXiv:1503.01409 to accommodate this result.\n\nhttps://in
dico.tifr.res.in/indico/conferenceDisplay.py?confId=6878
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6878
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black holes in AdS/CFT (Tata- Infosys Lecture Series)
DTSTART;VALUE=DATE-TIME:20190128T060000Z
DTEND;VALUE=DATE-TIME:20190128T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6888@cern.ch
DESCRIPTION:We study the index of large N SCFTs with gravity duals\, and a
ccount for the thermodynamics of certain supersymmetric AdS black holes. M
ore concretely\, we shall: explore a generalized Cardy formula for higher
dimensional SCFT and use it to count large supersymmetric AdS black holes\
; explore deconfinement phase transitions\; study novel large N and large
charge saddle points which exhibit certain features reminiscent of hairy b
lack holes\, among others.\n\nhttps://indico.tifr.res.in/indico/conference
Display.py?confId=6888
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6888
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black holes in AdS/CFT (Tata- Infosys Lecture Series) [2nd lecture
]
DTSTART;VALUE=DATE-TIME:20190129T090000Z
DTEND;VALUE=DATE-TIME:20190129T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6892@cern.ch
DESCRIPTION:We study the index of large N SCFTs with gravity duals\, and a
ccount for the thermodynamics of certain supersymmetric AdS black holes. M
ore concretely\, we shall: explore a generalized Cardy formula for higher
dimensional SCFT and use it to count large supersymmetric AdS black holes\
; explore deconfinement phase transitions\; study novel large N and large
charge saddle points which exhibit certain features reminiscent of hairy b
lack holes\, among others.\n\nhttps://indico.tifr.res.in/indico/conference
Display.py?confId=6892
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6892
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black holes in AdS/CFT (Tata- Infosys Lecture Series) [3rd lecture
]
DTSTART;VALUE=DATE-TIME:20190201T060000Z
DTEND;VALUE=DATE-TIME:20190201T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6894@cern.ch
DESCRIPTION:We study the index of large N SCFTs with gravity duals\, and a
ccount for the thermodynamics of certain supersymmetric AdS black holes. M
ore concretely\, we shall: explore a generalized Cardy formula for higher
dimensional SCFT and use it to count large supersymmetric AdS black holes\
; explore deconfinement phase transitions\; study novel large N and large
charge saddle points which exhibit certain features reminiscent of hairy b
lack holes\, among others.\n\nhttps://indico.tifr.res.in/indico/conference
Display.py?confId=6894
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6894
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards Singlet Spectrum in SYK-like Tensor Models [Quantum Spacet
ime seminar series]
DTSTART;VALUE=DATE-TIME:20190204T060000Z
DTEND;VALUE=DATE-TIME:20190204T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6906@cern.ch
DESCRIPTION:Recently\, a lot of work has been done on the SYK model and it
s tensor counterparts. These SYK-like tensor models are first introduced b
y Witten based on the work of Gurau et al. I start by introducing these SY
K-like tensor models and then discuss briefly some numerical results about
the spectrum of N=27 uncolored model. After this\, I will propose a syste
matic way to: a) Diagonalize the Hamiltonian of these tensor models analyt
ically b) Identify the gauge invariant/singlet states among the eigenstate
s of the Hamiltonian.\n\nI will then discuss a nontrivial example where we
have identified the complete singlet spectrum analytically using the abov
e method. I conclude my talk by listing some future directions.\n\nhttps:/
/indico.tifr.res.in/indico/conferenceDisplay.py?confId=6906
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6906
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bulk Locality and Asymptotic Causal Diamonds [Quantum Spacetime se
minar series]
DTSTART;VALUE=DATE-TIME:20190211T060000Z
DTEND;VALUE=DATE-TIME:20190211T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6919@cern.ch
DESCRIPTION:In AdS/CFT\, the non-uniqueness of the reconstructed bulk from
boundary subregions has motivated the notion of code subspaces. We presen
t some closely related structures that arise in flat space. A useful orga
nizing idea is that of an {\\em asymptotic} causal diamond (ACD): a causal
diamond attached to the conformal boundary of Minkowski space. The space
of ACDs is defined by pairs of points\, one each on the future and past nu
ll boundaries\, ${\\cal I}^{\\pm}$. We observe that for flat space with an
IR cut-off\, this space (a) encodes a preferred class of boundary subregi
ons\, (b) is a plausible way to capture holographic data for local bulk re
construction\, (c) has a natural interpretation as the kinematic space for
holography\, (d) leads to a holographic entanglement entropy in flat spa
ce that matches previous definitions and satisfies strong sub-additivity\,
and (e) has a bulk union/intersection structure identical to the one that
motivated the introduction of quantum error correction in AdS/CFT. Even t
hough our discussion is centered around flat space\, we note that there ar
e notions of ACDs in other spacetimes as well. They could provide a covari
ant way to abstractly characterize tensor sub-factors of Hilbert spaces of
holographic theories.\n\nhttps://indico.tifr.res.in/indico/conferenceDisp
lay.py?confId=6919
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6919
END:VEVENT
BEGIN:VEVENT
SUMMARY:Extremal surfaces\, de Sitter entropy and entanglement in ghost sy
stems [Quantum Spacetime seminar series]
DTSTART;VALUE=DATE-TIME:20190225T060000Z
DTEND;VALUE=DATE-TIME:20190225T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6956@cern.ch
DESCRIPTION:We find connected codim-2 extremal surfaces stretching between
the future and past boundaries in the static coordinatization of de Sitte
r space. These are analogous to rotated versions of certain surfaces in th
e AdS black hole. The existence of these surfaces via the dS/CFT framework
suggests the speculation that dS4 is dual to two copies of ghost-like CFT
s in a thermofield-double-type entangled state. In studies of entanglement
in ghost systems and "ghost-spin" chains\, we show that similar entangled
states in two copies of ghost-spin ensembles always have positive norm an
d positive entanglement.\n\nhttps://indico.tifr.res.in/indico/conferenceDi
splay.py?confId=6956
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6956
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exact results in N=1 theories of class S_{k} (Tata Infosys
Lecture Series) (Lecture 1)
DTSTART;VALUE=DATE-TIME:20190306T060000Z
DTEND;VALUE=DATE-TIME:20190306T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6969@cern.ch
DESCRIPTION:We will begin by introducing this class of N=1 SCFTs\, which i
s obtained from Gaiotto’s class S of N=2 SCFTs via orbifolding. We can s
tudy the Coulomb branch of these theories by constructing and analyzing th
eir spectral curves. Employing our experience with the AGT correspondence
we will search for a 2D/4D relation for the N=1 SCFTs in class Sk. From th
e curves we can identify the 2D CFT symmetry algebra and its representatio
ns\, namely the conformal blocks of the Virasoro/W-algebra\, that underlie
the 2D theory and reproduce the spectral curves of the N = 1 SCFTs. These
conformal blocks give a prediction for the instanton partition functions
of the 4D N = 1 SCFTs of class Sk. Finally\, we will present a completely
independent\, elliptic genus calculation\, counting open string states on
Dp/D(p-4) brane systems in type IIB string theory\, which exactly reproduc
es our previous result for the instanton partition functions.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=6969
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6969
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exact results in N=1 theories of class S_{k} (Tata Infosys
Lecture Series) (Lecture 2)
DTSTART;VALUE=DATE-TIME:20190308T060000Z
DTEND;VALUE=DATE-TIME:20190308T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6973@cern.ch
DESCRIPTION:We will begin by introducing this class of N=1 SCFTs\, which i
s obtained from Gaiotto’s class S of N=2 SCFTs via orbifolding. We can s
tudy the Coulomb branch of these theories by constructing and analyzing th
eir spectral curves. Employing our experience with the AGT correspondence
we will search for a 2D/4D relation for the N=1 SCFTs in class Sk. From th
e curves we can identify the 2D CFT symmetry algebra and its representatio
ns\, namely the conformal blocks of the Virasoro/W-algebra\, that underlie
the 2D theory and reproduce the spectral curves of the N = 1 SCFTs. These
conformal blocks give a prediction for the instanton partition functions
of the 4D N = 1 SCFTs of class Sk. Finally\, we will present a completely
independent\, elliptic genus calculation\, counting open string states on
Dp/D(p-4) brane systems in type IIB string theory\, which exactly reproduc
es our previous result for the instanton partition functions.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=6973
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6973
END:VEVENT
BEGIN:VEVENT
SUMMARY:Applications of Mathieu Moonshine in N=4 supersymmetric theories (
Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20190311T043000Z
DTEND;VALUE=DATE-TIME:20190311T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6979@cern.ch
DESCRIPTION:We study the properties of 1/4 BPS dyons in N=4 type II string
compactified on K3 x T2 orbifolded with an action of automorphism g' of
K3 corresponding to the conjugacy classes of Mathieu group M24 and a 1/N
shift in one of the circles of T2. The partition function of dyons in thes
e compactifications are given in terms of inverse of Siegel modular forms
constructed from the lift of the twisted elliptic genus. The sign of the s
upersymmetric index counting 1/4 BPS dyons agrees with that predicted from
black hole physics as conjectured by Sen. We also study the properties of
1/4 BPS dyons in type II string theory compactified on Z2 and Z3 orbifold
s on T6 with 1/N shift in one of the S1 and encounter some violations to t
his conjecture. These point to the existence of possible non-trivial hair
modes for 1/4 BPS dyons in these theories. We associate mock modular forms
corresponding to single centred black holes and extend the work of Dabhol
kar-Murthy-Zagier to these orbifolds of K3 and also for the toroidal orbif
olds.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=697
9
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6979
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exact results in N=1 theories of class S_{k} (Tata Infosys
Lecture Series) (Lecture 3)
DTSTART;VALUE=DATE-TIME:20190312T060000Z
DTEND;VALUE=DATE-TIME:20190312T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6982@cern.ch
DESCRIPTION:We will begin by introducing this class of N=1 SCFTs\, which i
s obtained from Gaiotto’s class S of N=2 SCFTs via orbifolding. We can s
tudy the Coulomb branch of these theories by constructing and analyzing th
eir spectral curves. Employing our experience with the AGT correspondence
we will search for a 2D/4D relation for the N=1 SCFTs in class Sk. From th
e curves we can identify the 2D CFT symmetry algebra and its representatio
ns\, namely the conformal blocks of the Virasoro/W-algebra\, that underlie
the 2D theory and reproduce the spectral curves of the N = 1 SCFTs. These
conformal blocks give a prediction for the instanton partition functions
of the 4D N = 1 SCFTs of class Sk. Finally\, we will present a completely
independent\, elliptic genus calculation\, counting open string states on
Dp/D(p-4) brane systems in type IIB string theory\, which exactly reproduc
es our previous result for the instanton partition functions.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=6982
LOCATION: B333\, DBS\, TIFR
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6982
END:VEVENT
BEGIN:VEVENT
SUMMARY:Inversion formula: possible applications
DTSTART;VALUE=DATE-TIME:20190312T090000Z
DTEND;VALUE=DATE-TIME:20190312T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6983@cern.ch
DESCRIPTION:I will discuss some of the applications related to the inversi
on formula in CFT\, recently proposed by Simon Caron Huot.\n\nhttps://indi
co.tifr.res.in/indico/conferenceDisplay.py?confId=6983
LOCATION: B333
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6983
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holography from Permutations (Tata Infosys Lecture Series) [1st Le
cture]
DTSTART;VALUE=DATE-TIME:20190313T043000Z
DTEND;VALUE=DATE-TIME:20190313T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6984@cern.ch
DESCRIPTION:This talk reviews applications of the symmetric group to Yang-
Mills theories. Specifically\, we describe how to count and construct gaug
e invariant operators and the compute their correlation functions\, we des
cribe methods to count and construct the complete set of Feynman graphs co
ntributing at a given order in perturbation theory and we describe how to
count and construct primary operators in free field theories.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=6984
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6984
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holography from Permutations (Tata Infosys Lecture Series) [Lectur
e 2]
DTSTART;VALUE=DATE-TIME:20190314T060000Z
DTEND;VALUE=DATE-TIME:20190314T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6988@cern.ch
DESCRIPTION:This talk reviews applications of the symmetric group to Yang-
Mills theories. Specifically\, we describe how to count and construct gaug
e invariant operators and the compute their correlation functions\, we des
cribe methods to count and construct the complete set of Feynman graphs co
ntributing at a given order in perturbation theory and we describe how to
count and construct primary operators in free field theories.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=6988
LOCATION:School of Mathematics Seminar Room A369
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6988
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holography from Permutations (Tata Infosys Lecture Series) [Lectur
e 3]
DTSTART;VALUE=DATE-TIME:20190315T060000Z
DTEND;VALUE=DATE-TIME:20190315T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6994@cern.ch
DESCRIPTION:This talk reviews applications of the symmetric group to Yang-
Mills theories. Specifically\, we describe how to count and construct gaug
e invariant operators and the compute their correlation functions\, we des
cribe methods to count and construct the complete set of Feynman graphs co
ntributing at a given order in perturbation theory and we describe how to
count and construct primary operators in free field theories.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=6994
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6994
END:VEVENT
BEGIN:VEVENT
SUMMARY:Conformal Bootstrap in Mellin space and loops in AdS (Quantum Spac
etime Seminar series)
DTSTART;VALUE=DATE-TIME:20190315T090000Z
DTEND;VALUE=DATE-TIME:20190315T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6995@cern.ch
DESCRIPTION:I would begin my talk by showing how calculations in conformal
bootstrap problems simplify significantly in Mellin space and we also lea
rn new things more transparently. Then I would compare the usual bootstrap
with Polyakov Mellin approach to get some intuitions about contact terms.
At the end I would discuss very briefly what we are trying at present. I
would also talk about fixing AdS Loops using CFT data.\n\nhttps://indico.t
ifr.res.in/indico/conferenceDisplay.py?confId=6995
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6995
END:VEVENT
BEGIN:VEVENT
SUMMARY:Analyticity and Crossing Symmetry of Superstring Loop Amplitudes (
Quantum Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20190318T060000Z
DTEND;VALUE=DATE-TIME:20190318T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-6997@cern.ch
DESCRIPTION:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
6997
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=6997
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chern-Simons theories on generic three manifolds and matrix models
(Quatum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20190325T060000Z
DTEND;VALUE=DATE-TIME:20190325T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7006@cern.ch
DESCRIPTION:We shall discuss Chern-Simons (CS) theories with rank N and le
vel k on generic three manifold. The partition functions of such theories
can be written as a function of modular transformation matrices summed ove
r different integrable representations of affine Lie algebra u(N)k. Using
properties of modular transform matrices we express the partition function
s of these theories as a unitary matrix model. We show that\, the eigenval
ues of unitary matrices are discrete and proportional to hook lengths of t
he corresponding integrable Young diagram. As a result\, in the large N li
mit\, the eigenvalue density develops an upper cap. We consider CS theory
on S2 × S1 coupled with fundamental matters and express the partition fun
ctions in terms of modular transformation matrices. Solving this model at
large N we find the dominant integrable representations and show how large
N representations are related to each other by transposition of Young dia
grams as a result of level rank duality. Next we consider U(N) CS theory o
n S3 and observed that in a particular framing the dominant representation
is no longer an integrable representation after a critical value of ’t
Hooft coupling. We also show that CS on S3 admits multiple (two-gap phase)
large N phases with the same free energy.\n\nhttps://indico.tifr.res.in/i
ndico/conferenceDisplay.py?confId=7006
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7006
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matter Chern Simons Theories in a Background Magnetic Field (Quant
um Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20190327T060000Z
DTEND;VALUE=DATE-TIME:20190327T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7014@cern.ch
DESCRIPTION:In the talk we will discuss large N Chern Simons gauged fundam
ental fermions in the presence of a uniform background magnetic field for
the U(1) global symmetry. In the absence of the magnetic field the fermion
ic propagators of this theory obey well known Schwinger Dynson equtions. I
t will be demonstrated that magnetic field modifies these Schwinger Dyson
equations only by changing products to Moyal star products. Using a basis
of functions extensively studied in the literature on non-commutative soli
tons\, we will be able to exactly solve this gap equation\, and so exactly
determine the spectrum of single fermion energies at zero temperature but
arbitrary chemical potential. Interaction effects shift the values of unf
illed Landau Level energies in a very simple manner: the main qualitative
modification has a simple interpretation in terms of the effective spin of
excitations. More interestingly filled Landau Levels often (i.e. in most
ranges of parameters) broaden out\; it takes more energy to add the final
`fermion' to these levels than the initial `fermion'. We will independentl
y study the propagators of the Chern Simons gauged large N fundamental Wil
son Fisher bosons in a background magnetic field\, and verify that the spe
ctrum of single particle states so obtained exactly agrees with our fermio
nic results under the conjectured Bose/Fermi duality map\, yielding a nont
rivial test of the duality.\n\nhttps://indico.tifr.res.in/indico/conferenc
eDisplay.py?confId=7014
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7014
END:VEVENT
BEGIN:VEVENT
SUMMARY:Out of Time Ordered Quantum Dissipation (Quantum Spacetime Seminar
)
DTSTART;VALUE=DATE-TIME:20190401T060000Z
DTEND;VALUE=DATE-TIME:20190401T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7017@cern.ch
DESCRIPTION:Recently the connection of Out of Time Ordered Correlators (OT
OCs) to scrambling\, quantum chaos\, thermalisation etc has been realised.
With the increasing interest in OTOCs\, it will be useful to develop a sy
stematic prescription to compute them. In this talk I will discuss techniq
ues of effective theory to compute OTOCs in open quantum systems. In parti
cular\, I will focus on the problem of a quantum Brownian particle interac
ting with a dissipative bath composed of two sets of harmonic oscillators.
Besides the linear coupling between the particle and each set of oscillat
ors\, we add a small 3-body interaction\, between the particle and the osc
illators. This cubic coupling induces non-linear dissipation and noise ter
ms in the effective theory of the particle. For appropriate choice of dist
ributions of bath oscillators\, all the bath correlators decay exponential
ly fast at late times. Hence after the decay of the bath correlators has s
et in\, one can write down a suitable 1-PI effective action of the particl
e which is local in time. The correlators computed from the microscopic th
eory evolve the same way as the correlators computed from this 1-PI effect
ive action. If the bath has microscopic time-reversal invariance and therm
ality\, it imposes constraints on the 1-PI effective action. These constra
int relations between the effective couplings of 1-PI action are OTO gener
alisations of the well- known Onsager-Casimir reciprocal relations and flu
ctuation-dissipation relations. Combining these relations\, the non-Gaussi
anity of the thermal noise gets related to the thermal jitter in the dampi
ng constant of the Brownian particle.\n\nhttps://indico.tifr.res.in/indico
/conferenceDisplay.py?confId=7017
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7017
END:VEVENT
BEGIN:VEVENT
SUMMARY:The simplest problem in conformal bootstrap (Quantum Spacetime Sem
inar Series)
DTSTART;VALUE=DATE-TIME:20190408T060000Z
DTEND;VALUE=DATE-TIME:20190408T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7034@cern.ch
DESCRIPTION:I will discuss recent results in conformal bootstrap which mak
es use of crossing symmetric building blocks called Polyakov blocks. The s
implest bootstrap problem can be framed in 1 dimension\, i.e.\, conformal
quantum mechanics\, where the contact term ambiguity in the basis can be f
ixed. I will show how the resulting equations can be solved around the gen
eralized free field solution to any order in perturbation theory and discu
ss some observations about the anomalous dimensions. The resulting solutio
ns are predictions for diagrammatic calculations in AdS2 where only 1-loop
results exist.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?
confId=7034
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7034
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic subregion complexity of a 1+1 dimensional p-wave super
conductor
DTSTART;VALUE=DATE-TIME:20190412T090000Z
DTEND;VALUE=DATE-TIME:20190412T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7050@cern.ch
DESCRIPTION:We analyze the holographic subregion complexity in a 3d black
hole with the vector hair. This 3d black hole is dual to a 1 + 1 dimension
al p-wave superconductor. We probe the black hole by changing the size of
the interval and by fixing charge density or temperature. We confirm that
the universal part is always finite in both cases. The behavior of the sub
region complexity depends on the gravitational coupling constant divided b
y the gauge coupling constant. When this ratio is less than the critical v
alue\, the subregion complexity increases as temperature becomes low. This
behavior is similar to the one of the holographic 1 + 1 dimensional s-wav
e superconductor arXiv:1704.00557. When the ratio is larger than the criti
cal value\, the subregion complexity has a non-monotonic behavior as a fun
ction of q or T. We also find a discontinuous jump of the subregion comple
xity as a function of the size of the interval. The subregion complexity h
as the maximum when it wraps the almost entire spatial circle. The univers
al term in the condensed phase becomes even smaller than that of the norma
l phase by probing the black hole horizon at a large interval. It implies
that the formed condensate decreases the subregion complexity like the cas
e of the entanglement entropy.\n\nhttps://indico.tifr.res.in/indico/confer
enceDisplay.py?confId=7050
LOCATION: D 406
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7050
END:VEVENT
BEGIN:VEVENT
SUMMARY: Is Holography Implicit in Canonical Gravity? (Quantum Spacetime S
eminar series)
DTSTART;VALUE=DATE-TIME:20190415T060000Z
DTEND;VALUE=DATE-TIME:20190415T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7056@cern.ch
DESCRIPTION:We conjecture that\, in asymptotically anti-de Sitter space\,
two solutions of the Wheeler-DeWitt equation that coincide asymptotically
must also coincide in the bulk. This suggests that the essential elements
of holography are already present in canonical gravity. Our argument sheds
light on why holography works only in gravitational theories\, and also o
n the significance of anti-de Sitter boundary conditions.\n\nhttps://indic
o.tifr.res.in/indico/conferenceDisplay.py?confId=7056
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7056
END:VEVENT
BEGIN:VEVENT
SUMMARY:Probing the black hole interior in AdS/CFT (Tata- Infosys Lecture
Series) (Lecture 1)
DTSTART;VALUE=DATE-TIME:20190416T060000Z
DTEND;VALUE=DATE-TIME:20190416T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7062@cern.ch
DESCRIPTION:It is believed that the black hole information paradox is clos
ely related to the question of whether spacetime extends behind the black
hole horizon. We review arguments connecting these questions and discuss a
ttempts towards describing the black hole interior in the AdS/CFT correspo
ndence. We present a conjecture about the geometry of a typical black hole
microstate and how it can be probed by perturbing the CFT Hamiltonian wit
h state-dependent operators\, thus implementing a 1-sided analogue of the
Gao-Jafferis-Wall traversable wormhole protocol. We formulate necessary co
nditions for the existence of a smooth interior for typical microstates\,
in terms of the chaotic behavior of out-of-time-ordercorrelators at scramb
ling time. We\ndiscuss how some of these questions can be studied in the S
YK model.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId
=7062
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7062
END:VEVENT
BEGIN:VEVENT
SUMMARY:Probing the black hole interior in AdS/CFT (Tata- Infosys Lecture
Series) (Lecture 2)
DTSTART;VALUE=DATE-TIME:20190418T043000Z
DTEND;VALUE=DATE-TIME:20190418T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7065@cern.ch
DESCRIPTION:It is believed that the black hole information paradox is clos
ely related to the question of whether spacetime extends behind the black
hole horizon. We review arguments connecting these questions and discuss a
ttempts towards describing the black hole interior in the AdS/CFT correspo
ndence. We present a conjecture about the geometry of a typical black hole
microstate and how it can be probed by perturbing the CFT Hamiltonian wit
h state-dependent operators\, thus implementing a 1-sided analogue of the
Gao-Jafferis-Wall traversable wormhole protocol. We formulate necessary co
nditions for the existence of a smooth interior for typical microstates\,
in terms of the chaotic behavior of out-of-time-ordercorrelators at scramb
ling time. We\ndiscuss how some of these questions can be studied in the S
YK model.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId
=7065
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7065
END:VEVENT
BEGIN:VEVENT
SUMMARY:Probing the black hole interior in AdS/CFT (Tata- Infosys Lecture
Series) (Lecture 3)
DTSTART;VALUE=DATE-TIME:20190418T060000Z
DTEND;VALUE=DATE-TIME:20190418T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7066@cern.ch
DESCRIPTION:It is believed that the black hole information paradox is clos
ely related to the question of whether spacetime extends behind the black
hole horizon. We review arguments connecting these questions and discuss a
ttempts towards describing the black hole interior in the AdS/CFT correspo
ndence. We present a conjecture about the geometry of a typical black hole
microstate and how it can be probed by perturbing the CFT Hamiltonian wit
h state-dependent operators\, thus implementing a 1-sided analogue of the
Gao-Jafferis-Wall traversable wormhole protocol. We formulate necessary co
nditions for the existence of a smooth interior for typical microstates\,
in terms of the chaotic behavior of out-of-time-ordercorrelators at scramb
ling time. We\ndiscuss how some of these questions can be studied in the S
YK model.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId
=7066
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7066
END:VEVENT
BEGIN:VEVENT
SUMMARY:Action principle in conformal supergravity (Quantum Spacetime Semi
nar)
DTSTART;VALUE=DATE-TIME:20190422T090000Z
DTEND;VALUE=DATE-TIME:20190422T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7069@cern.ch
DESCRIPTION:In this talk we will discuss about a generic action principle
that can be applied to construct invariant actions in conformal supergravi
ty. We will see how well known invariant action such as the N=2 chiral den
sity formula can be derived using this principle. We will further use the
principle to derive a new density formula in N=2 conformal supergravity an
d we will discuss how this can be applied to construct new couplings of te
nsor multiplet to N=2 conformal supergravity.\n\nhttps://indico.tifr.res.i
n/indico/conferenceDisplay.py?confId=7069
LOCATION: D 406
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7069
END:VEVENT
BEGIN:VEVENT
SUMMARY:An invitation to moonshine (Quantum Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20190430T060000Z
DTEND;VALUE=DATE-TIME:20190430T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7087@cern.ch
DESCRIPTION:I will review the appearance of moonshines associated with the
Mathieu Groups in the counting of BPS states in N=4 supersymmetric string
theory. Moonshine refines the the second-quantised elllptic genus of K3 a
nd implies a product formula to a closely related Siegel modular form. The
se Siegel modular forms in certain cases are related to Lie algebras whose
root lattices emerge from the walls of marginal stabilty of quarter-BPS d
yons. We argue for the existence of a new class of Lie algebras that arise
for particular N=4 supersymmetric string theories. If time permits\, I wi
ll discuss examples from Umbral moonshine that non-trivially extends Mathi
eu moonshine.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?co
nfId=7087
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7087
END:VEVENT
BEGIN:VEVENT
SUMMARY:Boundary CFTs and Functional Bootstrap (Quantum Spacetime Series s
eminar)
DTSTART;VALUE=DATE-TIME:20190506T060000Z
DTEND;VALUE=DATE-TIME:20190506T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7097@cern.ch
DESCRIPTION:I will talk about the functional approach to conformal bootstr
ap. Analytic functionals provide a bootstrap basis\, that is built on the
analytic understanding of a CFT. This method has a direct connection to th
e Mellin/Polyakov bootstrap\, and fixes the so-called "polynomial ambiguit
y" that limits the applicability of the latter. I will explain this for th
e case of boundary CFT-s\, where we have two different spectrum of operato
rs to fix. Finally I will demonstrate an example\, which will be the epsil
on expansion.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?co
nfId=7097
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7097
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jackiw-Teitelboim Gravity and Rotating Black Holes (Quantum Spacet
ime Seminar Series)
DTSTART;VALUE=DATE-TIME:20190611T053000Z
DTEND;VALUE=DATE-TIME:20190611T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7157@cern.ch
DESCRIPTION:We discuss how the free energy at low temperatures for near-ex
tremal black holes is correctly obtained from the Jackiw-Teitelboim (JT) m
odel of gravity. Our arguments apply to all black holes\, including rotati
ng ones\, whose metric has a near-horizon AdS2 factor and the associated S
L(2\,R) symmetry. We discuss the validity of these arguments from explicit
calculations for rotating black holes in 4 and 5 dimensions. Our results
suggest that the JT model could prove useful in analysing the dynamics of
near-extremal Kerr black holes found in nature.\n\nhttps://indico.tifr.res
.in/indico/conferenceDisplay.py?confId=7157
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7157
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic RG Flows for Class S Line Defects (Quantum Spacetime S
eminar Series)
DTSTART;VALUE=DATE-TIME:20190617T060000Z
DTEND;VALUE=DATE-TIME:20190617T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7173@cern.ch
DESCRIPTION:In the recent past\, mysterious six dimensional (2\,0) SCFTs h
ave captured the attention of High Energy Physics community because of the
ir geometrical and algebraic applications besides being a playground for c
onjecturing and testing various dualities. Such theories admit natural exi
stence of loop operators which have been classified for certain subset of
theories known as "class S" with trivial ranked Lie algebra. The classific
ation is identified by the homotopy classes of non-self intersecting loops
on relevant Rienmann surface. In this talk\, I will present my work on lo
op operators of intractable higher ranked theories undergoing the "Renorma
lization Group" by using the AdS/CFT dictionary and "witnessing" the evolu
tion from gravity side. This is described by a set of "flow equations" sat
isfying the expectations of genuine loop operators obtained from the "weak
coupling"\nregime.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay
.py?confId=7173
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7173
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anomalous dimension and four point correlation function CS Matter
Theories
DTSTART;VALUE=DATE-TIME:20190627T103000Z
DTEND;VALUE=DATE-TIME:20190627T113000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7204@cern.ch
DESCRIPTION:We present a conjecture for anomalous dimension of the single
trace operator in CS matter theory. We provide both strong and weak coupli
ng check of this conjecture. I’ll also discuss four point function in Su
per-Symmetric Chern Simons matter theory.\n\nhttps://indico.tifr.res.in/in
dico/conferenceDisplay.py?confId=7204
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7204
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitational collapse in SYK models and Choptuik-like phenomenon
(Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20190701T060000Z
DTEND;VALUE=DATE-TIME:20190701T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7206@cern.ch
DESCRIPTION:We consider quantum quench in a deformed SYK model which permi
ts a low energy description in terms of pseudo Nambu Goldstone modes. The
bulk dual represents a gravitational collapse\, represented by a bulk matt
er stress tensor which is discontinuous in time near the boundary. Collaps
e to a black hole requires the quench parameter Δϵ to exceed a certain c
ritical value Δϵc. This corresponds to a Choptuik-like phenomenon with t
he Hawking temperature of the resulting black hole given by Tbh ∝ (Δϵ
-Δϵc)1/2.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?conf
Id=7206
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7206
END:VEVENT
BEGIN:VEVENT
SUMMARY:Open quantum theory of two entangled atoms in De Sitter Space (Qua
ntum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20190702T060000Z
DTEND;VALUE=DATE-TIME:20190702T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7210@cern.ch
DESCRIPTION:In this talk\, we explore the features of quantum entanglement
of two atoms in background De Sitter space-time. Our set up is an Open Qu
antum System (OQS)\, where the two atoms\, each having two energy levels a
nd represented by Pauli operators projected along any arbitrary direction.
The system mimics the role of a pair of freely falling Unruh De-Witt dete
ctors\, which are allowed to nonadiabatically interact with a conformally
coupled massless probe scalar field which has the role of background therm
al bath. The effective dynamics of this combined system takes into account
of the non-adiabatic interaction\, which is commonly known as the Resonan
t Casimir Polder Interaction (RCPI) with the thermal bath. Our analysis re
veals that the RCPI of two stable entangled atoms in the quantum vacuum st
ates in OQS depends on the De Sitter space-time curvature relevant to the
temperature of the thermal bath felt by the static observer. We find that
the Lamb Shift is characterised by a decreasing inverse square power law b
ehaviour\, L-2\, when inter atomic Euclidean distance\, L\, is much larger
than a characteristic length scale\, k\, which is the inverse of the curv
ature of De Sitter space. If the background space-time would have been Min
kowskian this shift decreases as\, L-1\, and is independent of temperature
. Additionally\, after tracing over bath modes we solve the time evolution
of the reduced system in presence of a dissipator or Lindbladian operator
to know the early and late time behaviour of the OQS\, which will help us
to quantify the equilibrium temperature of the thermal bath. Finally\, we
quantify various quantum information theoretic measures and the issue of
quantum non-locality through Bell's inequality violation to study the role
of quantum entanglement and long-range correlations in De Sitter space.\n
\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7210
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7210
END:VEVENT
BEGIN:VEVENT
SUMMARY:BTZ Dynamics and Chaos
DTSTART;VALUE=DATE-TIME:20190705T060000Z
DTEND;VALUE=DATE-TIME:20190705T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7212@cern.ch
DESCRIPTION:We find an effective action for gravitational interactions wit
h scalars in AdS3 to first order in GN at the conformal boundary. This act
ion can be understood as an action for the Brown-Henneaux modes and is giv
en by the square-root product of right and left moving Schwarzian derivati
ves for conformal transformations of the boundary. We thus reproduce the r
esult λL= 2π/β for OTOC computed first in arXiv:1412.6087 for a Schwarz
child black hole in AdS3. Applying the same procedure to rotating BTZ we f
ind the Lyapunov index to be λ_L= 2π/β+ > 2π/β where β+ = β(1-μL)\
, with μL= r-/r+ being the chemical potential for angular momentum. We th
us comment on a possible modification to a part of the proof given in arXi
v:1503.01409 to accommodate this result.\n\nhttps://indico.tifr.res.in/ind
ico/conferenceDisplay.py?confId=7212
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7212
END:VEVENT
BEGIN:VEVENT
SUMMARY:Landau ordering and other novel phase transitions beyond the Landa
u paradigm [Joint QST-CMP seminar]
DTSTART;VALUE=DATE-TIME:20190708T060000Z
DTEND;VALUE=DATE-TIME:20190708T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7218@cern.ch
DESCRIPTION:I will discuss recent results on a variety of novel quantum ph
ase transitions\, focusing on systems in 3+1 dimensions. I will describe s
everal surprising quantum critical phenomena - examples will include multi
ple universality classes for the same phase transition\, the concept of un
necessary quantum criticality\, and Landau ordering transitions that are b
eyond the Landau paradigm. Time permitting I will describe a possible simp
le dual description of a strongly coupled 3+1-D quantum field theory.\n\nh
ttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7218
LOCATION: AG69
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7218
END:VEVENT
BEGIN:VEVENT
SUMMARY:TTbar Deformations and 2d Quantum Gravity
DTSTART;VALUE=DATE-TIME:20190710T090000Z
DTEND;VALUE=DATE-TIME:20190710T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7219@cern.ch
DESCRIPTION:In this talk\, I will review the TTbar deformation of 2d QFTs\
, with a particular focus on its formulation as a 2d quantum gravity theor
y. I'll explain what the deformation is\, then explain why the deformed th
eory is not a QFT\, and then chart a course (as determined by relevance to
my current projects) through the literature on its relation to 2d (and 3d
) quantum gravity\, hopefully ending in a short description of ongoing wor
k in this direction.\n\nhttps://indico.tifr.res.in/indico/conferenceDispla
y.py?confId=7219
LOCATION: AG69
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7219
END:VEVENT
BEGIN:VEVENT
SUMMARY:APS index theorem\, Path integral and mock-modularity
DTSTART;VALUE=DATE-TIME:20190719T060000Z
DTEND;VALUE=DATE-TIME:20190719T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7241@cern.ch
DESCRIPTION:APS index theorem is an extension of Atiyah-Singer index theor
em for cases of the manifolds with boundary. We will present an introducti
on to the index theorem in general and then an introduction to the APS ind
ex theorem. And after that\, we will present a physicist's derivation of A
PS index theorem. We will also show that the Atiyah-Patodi-Singer 𝜂η-i
nvariant can be related to the temperature-dependent Witten index of a non
compact theory. In the end\, we will present some observations on the rela
tions between mock-modular forms and APS eta invariant.\n\nArxiv: 1905.051
0\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7241
LOCATION: AG 69
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7241
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Quench in Matrix Quantum Mechanics and time dependent back
grounds in 2d strings (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20190722T060000Z
DTEND;VALUE=DATE-TIME:20190722T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7244@cern.ch
DESCRIPTION:We find solvable quantum quench protocols in c=1 matrix model
with a time dependent coupling and explore aspects of emergent time depend
ent space-times.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py
?confId=7244
LOCATION: AG69
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7244
END:VEVENT
BEGIN:VEVENT
SUMMARY:Asymptotic Symmetries in Odd Dimensions(Quantum Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20190726T060000Z
DTEND;VALUE=DATE-TIME:20190726T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7252@cern.ch
DESCRIPTION:The study of asymptotic symmetries in odd dimensional Minkowsk
i spacetime has been difficult due to the non-analytic structure of fields
near null infinity (in odd dimensions). We study the non-analytic terms a
nd show that once the dust settles\, the relationship between soft theorem
s and asymptotic symmetries continues to hold in odd dimensions as well.\n
\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7252
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7252
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitational dynamics from entanglement in holographic conformal
field theories (Tata-Infosys Lecture Series) (Lecture 1)
DTSTART;VALUE=DATE-TIME:20190730T060000Z
DTEND;VALUE=DATE-TIME:20190730T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7254@cern.ch
DESCRIPTION:We will discuss recent progress in understanding gravitational
dynamics in the context of the AdS/CFT correspondence as arising from the
constraints satisfied by the entanglement structure of states in holograp
hic conformal field theories. More precisely\, we will show that if the en
tanglement entropies of all subregions in a holographic state of the CFT s
atisfy the Ryu-Takayanagi formula\, then the bulk spacetime must necessari
ly satisfy the (non-linear) Einstein equation. Along the way\, we will als
o review recently developed techniques for computations of information the
oretic quantities such as entanglement entropies and modular Hamiltonians
in relativistic quantum field theories\, which have led to the proof of in
teresting universal constraints such as the averaged null energy condition
.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7254
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7254
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitational dynamics from entanglement in holographic conformal
field theories (Tata-Infosys Lecture Series) (Lecture 2)
DTSTART;VALUE=DATE-TIME:20190731T060000Z
DTEND;VALUE=DATE-TIME:20190731T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7255@cern.ch
DESCRIPTION:We will discuss recent progress in understanding gravitational
dynamics in the context of the AdS/CFT correspondence as arising from the
constraints satisfied by the entanglement structure of states in holograp
hic conformal field theories. More precisely\, we will show that if the en
tanglement entropies of all subregions in a holographic state of the CFT s
atisfy the Ryu-Takayanagi formula\, then the bulk spacetime must necessari
ly satisfy the (non-linear) Einstein equation. Along the way\, we will als
o review recently developed techniques for computations of information the
oretic quantities such as entanglement entropies and modular Hamiltonians
in relativistic quantum field theories\, which have led to the proof of in
teresting universal constraints such as the averaged null energy condition
.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7255
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7255
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitational dynamics from entanglement in holographic conformal
field theories (Tata-Infosys Lecture Series) (Lecture 3)
DTSTART;VALUE=DATE-TIME:20190802T060000Z
DTEND;VALUE=DATE-TIME:20190802T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7256@cern.ch
DESCRIPTION:We will discuss recent progress in understanding gravitational
dynamics in the context of the AdS/CFT correspondence as arising from the
constraints satisfied by the entanglement structure of states in holograp
hic conformal field theories. More precisely\, we will show that if the en
tanglement entropies of all subregions in a holographic state of the CFT s
atisfy the Ryu-Takayanagi formula\, then the bulk spacetime must necessari
ly satisfy the (non-linear) Einstein equation. Along the way\, we will als
o review recently developed techniques for computations of information the
oretic quantities such as entanglement entropies and modular Hamiltonians
in relativistic quantum field theories\, which have led to the proof of in
teresting universal constraints such as the averaged null energy condition
.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7256
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7256
END:VEVENT
BEGIN:VEVENT
SUMMARY:On maximal chaos exponent for theories with a global symmetry
DTSTART;VALUE=DATE-TIME:20190809T044500Z
DTEND;VALUE=DATE-TIME:20190809T054500Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7284@cern.ch
DESCRIPTION:In this note we study chaos in generic quantum systems with a
global symmetry generalizing seminal work [arXiv : 1503.01409] by Maldacen
a\, Shenker and Stanford. We conjecture a bound on chaos exponent in a the
rmodynamical ensemble at temperature T and chemical potential μ for the g
lobal symmetry under consideration. For local operators which could create
excitations upto some fixed charge\, the bound on chaos (Lyapunov) expone
nt is independent of chemical potential λL ≤ / 2πTℏ\;. On the other
hand when the operators could create excitations of arbitrary high charge\
, we find that exponent must satisfy λ_L ≤ / 2 π T (1- abs \\ μ μc
ℏ where μc is the maximum value of chemical potential for which the the
rmodynamic ensemble makes sense. As specific examples of quantum mechanica
l systems we consider conformal field theories. In a generic conformal fie
ld theory with internal U(1) symmetry living on a cylinder the former boun
d is applicable\, whereas in more interesting examples of holographic two
dimensional conformal field theories dual to Einstein gravity\, we argue t
hat later bound is saturated in presence of a non-zero chemical potential
for translation or rotation.\n\nhttps://indico.tifr.res.in/indico/conferen
ceDisplay.py?confId=7284
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7284
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black Holes in an environment in large $D$ as forced membranes (Qu
antum Spacetime Series Seminar)
DTSTART;VALUE=DATE-TIME:20190813T060000Z
DTEND;VALUE=DATE-TIME:20190813T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7289@cern.ch
DESCRIPTION:We analytically construct black hole solutions which asymptote
to solutions of Einstein Equations with arbitrary matter stress tensor of
strength $\\mathcal{O}(D^0)$ in terms of a dual co-dimension one `forced'
membrane propagating in the asymptotic spacetime.\n\nhttps://indico.tifr.
res.in/indico/conferenceDisplay.py?confId=7289
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7289
END:VEVENT
BEGIN:VEVENT
SUMMARY:On maximal chaos exponent for theories with a global symmetry (Par
t II)
DTSTART;VALUE=DATE-TIME:20190814T060000Z
DTEND;VALUE=DATE-TIME:20190814T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7290@cern.ch
DESCRIPTION:In this note we study chaos in generic quantum systems with a
global symmetry generalizing seminal work [arXiv : 1503.01409] by Maldacen
a\, Shenker and Stanford. We conjecture a bound on chaos exponent in a the
rmodynamical ensemble at temperature T and chemical potential μ for the g
lobal symmetry under consideration. For local operators which could create
excitations upto some fixed charge\, the bound on chaos (Lyapunov) expone
nt is independent of chemical potential λL ≤ / 2πTℏ\;. On the other
hand when the operators could create excitations of arbitrary high charge\
, we find that exponent must satisfy λ_L ≤ / 2 π T (1- abs \\ μ μc
ℏ where μc is the maximum value of chemical potential for which the the
rmodynamic ensemble makes sense. As specific examples of quantum mechanica
l systems we consider conformal field theories. In a generic conformal fie
ld theory with internal U(1) symmetry living on a cylinder the former boun
d is applicable\, whereas in more interesting examples of holographic two
dimensional conformal field theories dual to Einstein gravity\, we argue t
hat later bound is saturated in presence of a non-zero chemical potential
for translation or rotation.\n\nhttps://indico.tifr.res.in/indico/conferen
ceDisplay.py?confId=7290
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7290
END:VEVENT
BEGIN:VEVENT
SUMMARY:Supersymmetry and dimensional reduction from disorder: A review
DTSTART;VALUE=DATE-TIME:20190814T043000Z
DTEND;VALUE=DATE-TIME:20190814T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7293@cern.ch
DESCRIPTION:A certain class of disordered theories near criticality has\nc
haracteristics exactly similar to the critical point of the same\nsystem\,
in two dimensions less and without the disorder. This peculiar\nphenomeno
n\, called Parisi-Sourlas dimensional reduction\, happens due\nto a supers
ymmetry conjectured to exist at the disordered fixed\npoint. Various numer
ical results verify the dimensional reduction\,\nwhile others have found c
ounter-examples. Several proposals explaining\nthe exact mechanism exist i
n literature\, although a consensus is still\nlacking. I will try to give
a consistent picture summarising this wide\nstate of art.\n\nhttps://indic
o.tifr.res.in/indico/conferenceDisplay.py?confId=7293
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7293
END:VEVENT
BEGIN:VEVENT
SUMMARY:Status of Soft Theorem in D=4 (Its application in classical limit
and understanding as Ward identity) (Quantum Spacetime Series Seminar)
DTSTART;VALUE=DATE-TIME:20190819T060000Z
DTEND;VALUE=DATE-TIME:20190819T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7300@cern.ch
DESCRIPTION:In recent years we explored the understanding of factorization
property of the S-matrix for a theory containing massless particles(photo
n/graviton) when the energy of external massless particles are small (soft
particles). Though the leading factorization is discovered long ago (1965
) by Weinberg\, it's understanding in the subleading order (not restricted
to tree level) was not explored prior to our (with Sen) work due to the i
nfrared divergence of S-matrix in D=4. For loop corrected S-matrix\, we fo
und that the subleading soft factorization contains terms logarithmic in s
oft energy. The classical limit of this logarithmic terms in soft graviton
theorem provides a new classical tail memory with the known permanent shi
ft between the mirrors of gravitational wave detector. Currently\, we are
trying to understand whether this soft factorization can be understood as
the Ward identity of any asymptotic symmetry.\n\nhttps://indico.tifr.res.i
n/indico/conferenceDisplay.py?confId=7300
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7300
END:VEVENT
BEGIN:VEVENT
SUMMARY:Polytopes and Scattering Amplitudes in Scalar Field Theory (Quantu
m Spacetime Series Seminar)
DTSTART;VALUE=DATE-TIME:20190826T060000Z
DTEND;VALUE=DATE-TIME:20190826T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7312@cern.ch
DESCRIPTION:Starting with the seminal work of Arkani-Hamed et al.\, there
has been growing evidence of an intriguing relationship between the geomet
ry of certain class of Polytopes and scattering amplitudes of massless sca
lar particles. This new perspective on scattering amplitude aims to reconf
igure the fundamental postulates of S-matrix theory. A principle called Pr
ojectivity becomes primary and leads to unitarity and locality of the S ma
trix. In this talk\, I will review the key ideas of Arkani-Hamed et al. in
the context of the tree-level S matrix of massless φ3 theory. The polyt
ope whose geometry contains information about the S matrix is known as Ass
ociahedron. Associahedron polytope is a member of an entire family of poly
topes which are known as Accordiahedra and are objects of many recent stud
ies in combinatorial mathematics. I will show how the geometry of each Acc
ordiahedra is tied to tree-level S matrix of massless scalar field theory
with polynomial interactions. This analysis relies on some recent developm
ents in Mathematics of such polytopes that I will highlight.\n\nhttps://in
dico.tifr.res.in/indico/conferenceDisplay.py?confId=7312
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7312
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pure states and eigenstate thermalisation in the Schwarzian theory
(Quantum Spacetime Series Seminar)
DTSTART;VALUE=DATE-TIME:20190903T060000Z
DTEND;VALUE=DATE-TIME:20190903T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7322@cern.ch
DESCRIPTION:In this talk I will obtain the one-dimensional Schwarzian theo
ry by dimensionally reducing two-dimensional Liouville theory on an open s
tring. Different boundary conditions at the ends of the open string give r
ise to different states in the onedimensional Schwarzian theory. I will di
scuss the construction of these states and study the correlation functions
of bilocal operators in these states to study thermalisation. When the pu
re states are energy eigenstates\, expectation values of non-extensive ope
rators are thermal. On the other hand\, in coherent pure states\, these sa
me operators can exhibit ergodic or non-ergodic behavior\, which is charac
terized by elliptic\, parabolic or hyperbolic monodromy of an auxiliary eq
uation\; or equivalently\, which coadjoint Virasoro orbit the state lies o
n. This provides a renewed understanding of the role of coadjoint orbits i
n the low dimensional holography.\n\nhttps://indico.tifr.res.in/indico/con
ferenceDisplay.py?confId=7322
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7322
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pure states and eigenstate thermalisation in the Schwarzian theory
(Quantum Spacetime Series Seminar) (Part II)
DTSTART;VALUE=DATE-TIME:20190904T043000Z
DTEND;VALUE=DATE-TIME:20190904T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7325@cern.ch
DESCRIPTION:In this talk I will obtain the one-dimensional Schwarzian theo
ry by dimensionally reducing two-dimensional Liouville theory on an open s
tring. Different boundary conditions at the ends of the open string give r
ise to different states in the onedimensional Schwarzian theory. I will di
scuss the construction of these states and study the correlation functions
of bilocal operators in these states to study thermalisation. When the pu
re states are energy eigenstates\, expectation values of non-extensive ope
rators are thermal. On the other hand\, in coherent pure states\, these sa
me operators can exhibit ergodic or non-ergodic behavior\, which is charac
terized by elliptic\, parabolic or hyperbolic monodromy of an auxiliary eq
uation\; or equivalently\, which coadjoint Virasoro orbit the state lies o
n. This provides a renewed understanding of the role of coadjoint orbits i
n the low dimensional holography.\n\nhttps://indico.tifr.res.in/indico/con
ferenceDisplay.py?confId=7325
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7325
END:VEVENT
BEGIN:VEVENT
SUMMARY:Percolation on Hyperbolic groups (Quantum Spacetime Seminar)
DTSTART;VALUE=DATE-TIME:20190916T060000Z
DTEND;VALUE=DATE-TIME:20190916T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7345@cern.ch
DESCRIPTION:We study first passage percolation (FPP) in a Gromov-hyperboli
c group G with boundary equipped with the Patterson-Sullivan measure. We a
ssociate an i.i.d. collection of random passage times to each edge of a Ca
yley graph of G\, and investigate classical questions about asymptotics of
first passage time as well as the geometry of geodesics in the FPP metric
. Under suitable conditions on the passage time distribution\, we show tha
t the 'velocity' exists in almost every direction\, and is almost surely c
onstant by ergodicity of the G-action on the boundary. \n\nFor every point
on the boundary\, we also show almost sure coalescence of any two geodesi
c rays directed towards the point. Finally\, we show that the variance of
the first passage time grows linearly with word distance along word geodes
ic rays in every fixed boundary direction. \n\nThis is joint work with Ri
ddhipratim Basu\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?
confId=7345
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7345
END:VEVENT
BEGIN:VEVENT
SUMMARY:A new "deep" way of doing string phenomenology
DTSTART;VALUE=DATE-TIME:20190917T060000Z
DTEND;VALUE=DATE-TIME:20190917T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7353@cern.ch
DESCRIPTION:I will begin by discussing the computational complexity of fin
ding vacua in String theory. I will demonstrate that finding a vacuum in s
tring theory requires us to solve nested computationally hard problems. I
will then discuss some ways of getting around this complexity "hurdle" by
the use of state of the art Artificial Intelligence techniques such as dee
p reinforcement learning and genetic algorithms. I will conclude by discus
sing some of my ongoing work at the Physics and Machine learning (ML) inte
rsection. This talk will also include a lightning review of the AI concept
s used.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7
353
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7353
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent developments in strong cosmic censorship (Tata-Infosys Lect
ure series) (Lecture I)
DTSTART;VALUE=DATE-TIME:20190918T043000Z
DTEND;VALUE=DATE-TIME:20190918T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7347@cern.ch
DESCRIPTION:In most branches of fundamental physics\, if one knows the ini
tial state of a system exactly then one can predict its future state exact
ly. But in General Relativity this statement appears to be violated by cha
rged or rotating black holes. These possess inner horizons beyond which sp
acetime is not predictable from initial data describing the universe befor
e the black hole formed. The strong cosmic censorship conjecture asserts t
hat this behaviour is always unstable\, and thereby rescues determinism. T
here is plenty of evidence that the conjecture is true for asymptotically
flat black holes. However\, recent work has found that the conjecture may
be violated by certain black holes with a non-zero cosmological constant\,
specifically near-extremal charged de Sitter black holes in 3+1 dimension
s\, and the BTZ black hole in 2+1 dimensions. My lectures will review the
recent work on this topic. (References - arxiv:1808.02895\, 1906.08265)\n\
nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7347
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7347
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent developments in strong cosmic censorship (Tata-Infosys Lect
ure series) (Lecture II)
DTSTART;VALUE=DATE-TIME:20190919T060000Z
DTEND;VALUE=DATE-TIME:20190919T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7348@cern.ch
DESCRIPTION:In most branches of fundamental physics\, if one knows the ini
tial state of a system exactly then one can predict its future state exact
ly. But in General Relativity this statement appears to be violated by cha
rged or rotating black holes. These possess inner horizons beyond which sp
acetime is not predictable from initial data describing the universe befor
e the black hole formed. The strong cosmic censorship conjecture asserts t
hat this behaviour is always unstable\, and thereby rescues determinism. T
here is plenty of evidence that the conjecture is true for asymptotically
flat black holes. However\, recent work has found that the conjecture may
be violated by certain black holes with a non-zero cosmological constant\,
specifically near-extremal charged de Sitter black holes in 3+1 dimension
s\, and the BTZ black hole in 2+1 dimensions. My lectures will review the
recent work on this topic. (References - arxiv:1808.02895\, 1906.08265)\n\
nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7348
LOCATION: AG 66
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7348
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent developments in strong cosmic censorship (Tata-Infosys Lect
ure series) (Lecture III)
DTSTART;VALUE=DATE-TIME:20190920T043000Z
DTEND;VALUE=DATE-TIME:20190920T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7349@cern.ch
DESCRIPTION:In most branches of fundamental physics\, if one knows the ini
tial state of a system exactly then one can predict its future state exact
ly. But in General Relativity this statement appears to be violated by cha
rged or rotating black holes. These possess inner horizons beyond which sp
acetime is not predictable from initial data describing the universe befor
e the black hole formed. The strong cosmic censorship conjecture asserts t
hat this behaviour is always unstable\, and thereby rescues determinism. T
here is plenty of evidence that the conjecture is true for asymptotically
flat black holes. However\, recent work has found that the conjecture may
be violated by certain black holes with a non-zero cosmological constant\,
specifically near-extremal charged de Sitter black holes in 3+1 dimension
s\, and the BTZ black hole in 2+1 dimensions. My lectures will review the
recent work on this topic. (References - arxiv:1808.02895\, 1906.08265)\n\
nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7349
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7349
END:VEVENT
BEGIN:VEVENT
SUMMARY:Strong Cosmic Censorship and Spacetime Entanglement (Quantum Space
time seminar)
DTSTART;VALUE=DATE-TIME:20190923T060000Z
DTEND;VALUE=DATE-TIME:20190923T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7370@cern.ch
DESCRIPTION:We propose a necessary condition for smoothness of a quantum s
tate in the vicinity of a null surface. We study near horizon modes define
d locally near a patch of the null surface and show that\, in any smooth q
uantum state\, these modes must be correctly entangled. This test is consi
derably simpler than computing the full renormalized stress tensor. We imp
lement this test for Reissner Nordstrom black holes in Anti-de-Sitter spac
e and BTZ black holes. We provide evidence for instability of Cauchy horiz
on of RN-AdS in the Hartle-Hawking state. For BTZ black holes\, we find th
at modes defined just outside the Cauchy horizon pass our test. We show th
at\, in the extended spacetime\, it is possible to define modes just insid
e the Cauchy horizon such that modes across the Cauchy horizon are correct
ly entangled.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?co
nfId=7370
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7370
END:VEVENT
BEGIN:VEVENT
SUMMARY:Review of the preprint "Supersymmetric phases of 4d N=4 SYM at l
arge N"\, arXiv:1909.09597 [hep-th] (STMP journal club)
DTSTART;VALUE=DATE-TIME:20190924T060000Z
DTEND;VALUE=DATE-TIME:20190924T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7377@cern.ch
DESCRIPTION:I shall review the recent preprint "Supersymmetric phases of 4
d N=4 SYM at large N"\, arXiv:1909.09597 [hep-th] by Alejandro Cabo-Bizet
and Sameer Murthy.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.
py?confId=7377
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7377
END:VEVENT
BEGIN:VEVENT
SUMMARY:A modern take on the information paradox and progress towards its
resolution (Tata-Infosys lecture series) (Lecture 1)
DTSTART;VALUE=DATE-TIME:20190925T043000Z
DTEND;VALUE=DATE-TIME:20190925T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7373@cern.ch
DESCRIPTION:This lecture series will focus on recent progress addressing H
awking's black hole information paradox. I will review previous attempts o
f resolving this paradox and how it led to ideas of firewalls at the horiz
on\, state dependence of the interior\, and ER = EPR. I will present recen
t work demonstrating how holography can be used to reproduce the Page curv
e of an evaporating black hole\, and present the first model of unitary bl
ack hole evaporation that is semiclassical throughout. Finally\, I will di
scuss some ongoing work which derives these results more generally.\n\nhtt
ps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7373
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7373
END:VEVENT
BEGIN:VEVENT
SUMMARY:A modern take on the information paradox and progress towards its
resolution (Tata-Infosys lecture series) (Lecture 2)
DTSTART;VALUE=DATE-TIME:20190926T043000Z
DTEND;VALUE=DATE-TIME:20190926T060000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7374@cern.ch
DESCRIPTION:This lecture series will focus on recent progress addressing H
awking's black hole information paradox. I will review previous attempts o
f resolving this paradox and how it led to ideas of firewalls at the horiz
on\, state dependence of the interior\, and ER = EPR. I will present recen
t work demonstrating how holography can be used to reproduce the Page curv
e of an evaporating black hole\, and present the first model of unitary bl
ack hole evaporation that is semiclassical throughout. Finally\, I will di
scuss some ongoing work which derives these results more generally.\n\nhtt
ps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7374
LOCATION: AG 66
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7374
END:VEVENT
BEGIN:VEVENT
SUMMARY:A modern take on the information paradox and progress towards its
resolution (Tata-Infosys lecture series) (Lecture 3)
DTSTART;VALUE=DATE-TIME:20190927T043000Z
DTEND;VALUE=DATE-TIME:20190927T060000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7375@cern.ch
DESCRIPTION:This lecture series will focus on recent progress addressing H
awking's black hole information paradox. I will review previous attempts o
f resolving this paradox and how it led to ideas of firewalls at the horiz
on\, state dependence of the interior\, and ER = EPR. I will present recen
t work demonstrating how holography can be used to reproduce the Page curv
e of an evaporating black hole\, and present the first model of unitary bl
ack hole evaporation that is semiclassical throughout. Finally\, I will di
scuss some ongoing work which derives these results more generally.\n\nhtt
ps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7375
LOCATION: AG66
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7375
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thermal Correlators and Bosonisation Dualities in Large N Chern Si
mons Matter Theories
DTSTART;VALUE=DATE-TIME:20190927T090000Z
DTEND;VALUE=DATE-TIME:20190927T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7382@cern.ch
DESCRIPTION:We consider 3−d conformal field theories with U(N) Chern Sim
ons gauge fields coupled to fundamental bosonic and fermionic matter field
s in the fundamental representation at finite temperature. We compute the
thermal two-point correlation functions of the spin s = 0\; 1\; 2 gauge in
variant conformal primary operators these theories in the large N limit an
d exactly in the t’Hooft coupling λ . Our results provide additional te
sts of the onjectured bosonisation dualities in these theories at finite t
emperature.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?conf
Id=7382
LOCATION: AG 69
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7382
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-local divergences in open QFTs (Quantum Spacetime Seminar Seri
es)
DTSTART;VALUE=DATE-TIME:20190930T060000Z
DTEND;VALUE=DATE-TIME:20190930T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7383@cern.ch
DESCRIPTION:We study renormalisation of open QFTs. Unlike the unitary fiel
d theories\, open field theories have non-local divergences in one loop co
rrection to the coupling constants. We do not have a good understanding of
these divergences. A microscopic derivation of the open effective theory
could resolve their appearance. But integrating out the bath degrees of fr
eedom is technically difficult for a field. The recently proposed holograp
hic Schwinger-Keldysh prescription has opened up a new direction\; we can
derive the open action for fields.\n\nIn this seminar I shall discuss abou
t the renormalisation of open φ4 theory and discuss about non-local dive
rgences. I shall also talk about the recent progress on the holographic de
rivation of open φ4 theory.\n\nhttps://indico.tifr.res.in/indico/conferen
ceDisplay.py?confId=7383
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7383
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rank-Level Duality of Conformal Blocks (Quantum Spacetime Seminar
Series)
DTSTART;VALUE=DATE-TIME:20191014T060000Z
DTEND;VALUE=DATE-TIME:20191014T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7397@cern.ch
DESCRIPTION:We consider decompositions of conformal blocks associated with
affine Kac-Moody Lie algebras under conformal embeddings. These decomposi
tions often induce a perfect pairing between conformal blocks associated w
ith two different Lie algebras typically interchanging the rank of Lie alg
ebras with the levels involved and vice-versa. In this talk\, we will sur
vey known results on rank-level duality isomorphisms and discuss some appl
ications.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId
=7397
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7397
END:VEVENT
BEGIN:VEVENT
SUMMARY:An Introduction to TTbar and other Irrelevant Deformations of QFT2
(STMP Journal Club)
DTSTART;VALUE=DATE-TIME:20191015T060000Z
DTEND;VALUE=DATE-TIME:20191015T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7399@cern.ch
DESCRIPTION:Recently there has been a lot of activity in understanding irr
elevant deformations of QFTs in 2d. One such well studied deformation is
the so called TTbar deformation. In the talk I'm going to give an introduc
tion to TTbar deformation of QFT2. I will show why TTbar deformation is we
ll defined despite the fact that this deformation triggers a flow up the R
G trajectory in the space of theories. I'm going to prove the celebrated f
actorization property of the TTbar operator and finally derive the spectru
m of the deformed theory. If time permits\, I'm going to talk about the mo
dular properties of the deformed partition function and the constraints im
posed on the spectrum of the deformed theory from modular bootstrap.\n\nI'
m mostly going to focus the following papers:\nhep-th/0401146\, 1608.05499
\, 1608.05534\, 1801.06895\, 1808.02492\n\nhttps://indico.tifr.res.in/indi
co/conferenceDisplay.py?confId=7399
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7399
END:VEVENT
BEGIN:VEVENT
SUMMARY: Eigenvalue equation for the modular graph C_{a\,b\,c\,d}
(Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20191021T060000Z
DTEND;VALUE=DATE-TIME:20191021T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7415@cern.ch
DESCRIPTION:The modular graph Ca\,b\,c\,d on the torus is a three loop pla
nar graph in which two of the vertices have coordination number four\, whi
le the others have coordination number two. We obtain an eigenvalue equati
on satisfied by Ca\,b\,c\,d for generic values of a\,b\,c and d. This fami
ly of graphs arises in the calculation of one loop amplitudes in superstri
ng theory.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confI
d=7415
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7415
END:VEVENT
BEGIN:VEVENT
SUMMARY:Counting and constraining local four photon and four graviton S-ma
trices
DTSTART;VALUE=DATE-TIME:20191022T060000Z
DTEND;VALUE=DATE-TIME:20191022T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7413@cern.ch
DESCRIPTION:We study the space of all kinematically allowed four photon an
d four graviton S-matrices\, polynomial in scattering momenta. We demonstr
ate that this space is permutation invariant sector of a module over the r
ing of polynomials of the Mandelstam invariants s\, t and u. We construct
these modules for every value of the spacetime dimension D\, and so explic
itly count and parametrize the most general four photon and four graviton
S-matrix at any given derivative order. We also explicitly list the local
Lagrangians that give rise to these S-matrices. We then conjecture that th
e Regge growth of S-matrices in all physically acceptable classical theori
es is bounded by s2 at fixed t. In the case of photons a four parameter su
bset of the polynomial S-matrices constructed above satisfies this Regge c
riterion. In the case of gravity\, on the other hand\, no polynomial addit
ion to the Einstein S-matrix obeys this bound for D ≤ 6. When D ≥ 7 th
ere is a single six derivative polynomial Lagrangian consistent with our c
onjectured Regge growth bound. Our conjecture then implies that the Einste
in four graviton S-matrix does not admit any physically acceptable polynom
ial modifications for $D\\leq 6$. A preliminary analysis suggests any fini
te sum of pole exchange contributions to four graviton scattering also suc
h violates our conjectured Regge growth bound\, at least when D ≤ 6$\, e
ven when the exchanged particles have low spin.\n\nhttps://indico.tifr.res
.in/indico/conferenceDisplay.py?confId=7413
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7413
END:VEVENT
BEGIN:VEVENT
SUMMARY:Subchromatic Tensor Models (Quantum Spacetime Seminar Series)
DTSTART;VALUE=DATE-TIME:20191104T060000Z
DTEND;VALUE=DATE-TIME:20191104T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7431@cern.ch
DESCRIPTION:In addition to well-known adjoint/matrix model and vector mode
l large N limits\, a new large N limit dominated by melonic diagrams has a
ttracted a great deal of attention recently. The melonic limit was first o
bserved in tensor models\, but interest in this limit grew due in large pa
rt to its appearance in the SYK model. While there are important dynamical
differences between the SYK model and tensor models\, tensor models provi
de a very natural context for understanding the diagrammatics of the melon
ic large N limit\, and its possible generalizations.\n\nHere we seek to be
tter understand the entire range of models for which melonic diagrams domi
nate. We study tensor models constructed out of fields that are rank-r ten
sors with order-q interaction vertices. We define subchromatic tensor mode
ls to be those for which r \n\nhttps://indico.tifr.res.in/indico/conferenc
eDisplay.py?confId=7431
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7431
END:VEVENT
BEGIN:VEVENT
SUMMARY:Counting and constraining local four photon and four graviton S-ma
trices (Part II)
DTSTART;VALUE=DATE-TIME:20191107T060000Z
DTEND;VALUE=DATE-TIME:20191107T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7440@cern.ch
DESCRIPTION:We study the space of all kinematically allowed four photon an
d four graviton S-matrices\, polynomial in scattering momenta. We demonstr
ate that this space is permutation invariant sector of a module over the r
ing of polynomials of the Mandelstam invariants s\, t and u. We construct
these modules for every value of the spacetime dimension D\, and so explic
itly count and parametrize the most general four photon and four graviton
S-matrix at any given derivative order. We also explicitly list the local
Lagrangians that give rise to these S-matrices. We then conjecture that th
e Regge growth of S-matrices in all physically acceptable classical theori
es is bounded by s2 at fixed t. In the case of photons a four parameter su
bset of the polynomial S-matrices constructed above satisfies this Regge c
riterion. In the case of gravity\, on the other hand\, no polynomial addit
ion to the Einstein S-matrix obeys this bound for D ≤ 6. When D ≥ 7 th
ere is a single six derivative polynomial Lagrangian consistent with our c
onjectured Regge growth bound. Our conjecture then implies that the Einste
in four graviton S-matrix does not admit any physically acceptable polynom
ial modifications for $D\\leq 6$. A preliminary analysis suggests any fini
te sum of pole exchange contributions to four graviton scattering also suc
h violates our conjectured Regge growth bound\, at least when D ≤ 6$\, e
ven when the exchanged particles have low spin.\n\n\n\nIn the process\, we
classified the basis structures for photon and graviton local S-matrices.
In part II of this talk\, we will study the classification in a bit more
detail and constrain the four point flat space scattering amplitude for gr
avitons (as well as photons) using Classical Regge growth.\n\nhttps://indi
co.tifr.res.in/indico/conferenceDisplay.py?confId=7440
LOCATION:DAA Seminar room A269
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7440
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological open/closed string dualities (Quantum Spacetime Semina
r Series)
DTSTART;VALUE=DATE-TIME:20191111T060000Z
DTEND;VALUE=DATE-TIME:20191111T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7442@cern.ch
DESCRIPTION:We sharpen the duality between open and closed topological str
ing partition functions for topological gravity coupled to matter. The clo
sed string partition function is a generalized Kontsevich matrix model in
the large dimension limit. We integrate out off-diagonal degrees of freedo
m associated to one source eigenvalue\, and find an open/closed topologica
l string partition function. We connect our work to the literature on a wa
ve function of the KP integrable hierarchy and clarify the role of the ext
ended Virasoro generators that include all time variables as well as the c
oupling to the open string observable.\n\nhttps://indico.tifr.res.in/indic
o/conferenceDisplay.py?confId=7442
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7442
END:VEVENT
BEGIN:VEVENT
SUMMARY:K(E10) and Standard Model Fermions ( Special Quantum Spacetime sem
inar)
DTSTART;VALUE=DATE-TIME:20191113T043000Z
DTEND;VALUE=DATE-TIME:20191113T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7448@cern.ch
DESCRIPTION:In this talk I will explain the possible relevance of the `max
imally extended' hyperbolic Kac-Moody algebra E10 and its maximal compact
subalgebra K(E10) for unification. In particular I will show how K(E10) ca
n be put to use to amend a proposal due to M. Gell-Mann aimed at identifyi
ng the 48 spin-1/2 fermions of N=8 supergravity that remain after complete
breaking of supersymmetry with the 3 x 16 quarks and leptons of the Stand
ard Model. The supermassive gravitinos could then play a crucial role in e
xplaining both dark matter and the ultra-high energy cosmic ray (UHECR) ev
ents observed over many years at the Pierre Auger Observatory.\n\nhttps://
indico.tifr.res.in/indico/conferenceDisplay.py?confId=7448
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7448
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent developments in Chern-Simons-matter theories
DTSTART;VALUE=DATE-TIME:20191115T043000Z
DTEND;VALUE=DATE-TIME:20191115T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7462@cern.ch
DESCRIPTION:We review recent developments in the understanding of massive
phases of Chern-Simons theories coupled to vector-like matter and their be
haviour under Bose-Fermi duality. In particular\, we discuss the recent co
mputation of the large N free energy in the Higgsed phase of Chern-Simons
gauged Wilson-Fisher scalars and its mapping to the free energy of Chern-S
imons gauged regular fermions under Bose-Fermi duality. We further extend
our computations to the N = 2 supersymmetric Chern-Simons theory coupled
to one fundamental chiral multiplet and study the phase diagram of this t
heory at zero temperature. The phase diagram shows rich features\, includi
ng points where two second order phase transition lines meet.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=7462
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7462
END:VEVENT
BEGIN:VEVENT
SUMMARY:Unitarity and the Chaos bound (Quantum Spacetime seminar)
DTSTART;VALUE=DATE-TIME:20191118T060000Z
DTEND;VALUE=DATE-TIME:20191118T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7465@cern.ch
DESCRIPTION:We study the role of unitarity in various observables in 2d CF
Ts. We consider 2d CFTs with large central charge in a state obtained by t
he insertion of an operator of large conformal dimensions at spatial infin
ities in the thermal state. We show that there is a violation of the chaos
bound whenever the operator has negative conformal dimensions. We present
a specific realisation of this situation in the holographic Chern-Simons
formulation of a CFT with W3(2) symmetry also known as the Bershadsky-Poly
akov algebra. We also show that the unitarity bound in CFTs which admit W3
symmetry on states with higher spin-3 charge ensures that the chaos bound
is satisfied\, as well as the jump in entanglement entropy during local q
uantum quenches remains real and finite.\n\nhttps://indico.tifr.res.in/ind
ico/conferenceDisplay.py?confId=7465
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7465
END:VEVENT
BEGIN:VEVENT
SUMMARY:Remarks on operator complexity at very long times
DTSTART;VALUE=DATE-TIME:20191119T060000Z
DTEND;VALUE=DATE-TIME:20191119T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7473@cern.ch
DESCRIPTION:Operator complexity is usually discussed in fast scrambling sy
stems (such as SYK) as approximately equivalent to operator size. This sho
uld not hold after the scrambling time\, because operator size saturates w
hile complexity should grow linearly for asymptotically long times. We dis
cuss how a different notion of operator complexity\, called K-complexity\,
can behave as operator size for early times and still continue growing li
nearly after the scrambling time. In showing this we use the ETH hypothesi
s. We also discuss the linear growth of operator complexity from the point
of view of the bulk picture in holographic systems. We claim that the mom
entum/complexity correspondence naturally explains this asymptotic linear
growth if complexity is defined using the extremal-volume prescription.\n\
nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7473
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7473
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modular bootstrap at extreme and intermediate temperatures : asymp
totics and bounds (Quantum Spacetime seminar series)
DTSTART;VALUE=DATE-TIME:20191125T060000Z
DTEND;VALUE=DATE-TIME:20191125T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7479@cern.ch
DESCRIPTION:In the first part of the talk we shall generalize the modular
bootstrap techniques in two dimensional conformal theories\, so that they
can be applied to torus correlators and spherical conformal blocks. This w
ill give us Cardy-like expressions for weighted spectral densities. In the
second part we shall systematize the Hellerman analysis\, and show how un
der certain assumptions the c/12 upper bound on the lightest primary may b
e improved to c/10.38. Thereafter\, we shall discuss Tauberian improvement
s of the bounds for the first part and highlight some applications of the
results to the Eigenstate Thermalization Hypothesis criteria.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=7479
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7479
END:VEVENT
BEGIN:VEVENT
SUMMARY:BMS3 symmetries and Invariant Dual Field Theory
DTSTART;VALUE=DATE-TIME:20191202T060000Z
DTEND;VALUE=DATE-TIME:20191202T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7494@cern.ch
DESCRIPTION:The asymptotic symmetries of three dimensional (super)gravity
theories are known as (super)BMS3 symmetry. We shall first present the max
imal supersymmetric extension of this symmetry and study the various cosmo
logical solutions that are invariant under this symmetry. Next we construc
t the two dimensional field theories that realize (super)BMS3 symmetry and
study their possible implications for flat space holography.\n\nhttps://i
ndico.tifr.res.in/indico/conferenceDisplay.py?confId=7494
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7494
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higgs Confinement Phase Transition in Gauge Theories with Superflu
idity [Lecture 1] (Tata-Infosys Lecture Series)
DTSTART;VALUE=DATE-TIME:20191202T043000Z
DTEND;VALUE=DATE-TIME:20191202T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7496@cern.ch
DESCRIPTION:I discuss the conditions under which Higgs and confining regim
es in a gauge theory can be sharply distinguished. It is widely believed t
hat these regimes are smoothly connected unless they are distinguished by
the realization of global symmetries. However\, I show that when a U(1) gl
obal symmetry is spontaneously broken in both the confining and Higgs regi
mes\, there is a novel order parameter which can detect certain Higgs-conf
inement phase transitions. This result is explained in the context of cert
ain tractable gauge theories in three spacetime dimensions. These observat
ions significantly strengthen the case for the necessity of a phase transi
tion between nuclear matter and quark matter in QCD.\n\nhttps://indico.tif
r.res.in/indico/conferenceDisplay.py?confId=7496
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7496
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higgs Confinement Phase Transition in Gauge Theories with Superflu
idity [Lecture 2] (Tata-Infosys Lecture Series)
DTSTART;VALUE=DATE-TIME:20191203T060000Z
DTEND;VALUE=DATE-TIME:20191203T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7497@cern.ch
DESCRIPTION:I discuss the conditions under which Higgs and confining regim
es in a gauge theory can be sharply distinguished. It is widely believed t
hat these regimes are smoothly connected unless they are distinguished by
the realization of global symmetries. However\, I show that when a U(1) gl
obal symmetry is spontaneously broken in both the confining and Higgs regi
mes\, there is a novel order parameter which can detect certain Higgs-conf
inement phase transitions. This result is explained in the context of cert
ain tractable gauge theories in three spacetime dimensions. These observat
ions significantly strengthen the case for the necessity of a phase transi
tion between nuclear matter and quark matter in QCD.\n\nhttps://indico.tif
r.res.in/indico/conferenceDisplay.py?confId=7497
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7497
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higgs Confinement Phase Transition in Gauge Theories with Superflu
idity [Lecture 3] (Tata-Infosys Lecture Series)
DTSTART;VALUE=DATE-TIME:20191204T060000Z
DTEND;VALUE=DATE-TIME:20191204T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7498@cern.ch
DESCRIPTION:I discuss the conditions under which Higgs and confining regim
es in a gauge theory can be sharply distinguished. It is widely believed t
hat these regimes are smoothly connected unless they are distinguished by
the realization of global symmetries. However\, I show that when a U(1) gl
obal symmetry is spontaneously broken in both the confining and Higgs regi
mes\, there is a novel order parameter which can detect certain Higgs-conf
inement phase transitions. This result is explained in the context of cert
ain tractable gauge theories in three spacetime dimensions. These observat
ions significantly strengthen the case for the necessity of a phase transi
tion between nuclear matter and quark matter in QCD.\n\nhttps://indico.tif
r.res.in/indico/conferenceDisplay.py?confId=7498
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7498
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum chaos for weakly interacting bosons in a harmonic trap
DTSTART;VALUE=DATE-TIME:20191205T060000Z
DTEND;VALUE=DATE-TIME:20191205T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7508@cern.ch
DESCRIPTION:We consider identical quantum bosons with weak contact interac
tions in a two-dimensional isotropic harmonic trap. When the interactions
are turned off\, the energy levels are equidistant and highly degenerate.
At linear order in the coupling parameter\, these degenerate levels split\
, and we study the patterns of this splitting. It turns out that the probl
em is mathematically identical to diagonalizing the quantum resonant syste
m of the two-dimensional Gross-Pitaevskii equation\, whose classical count
erpart has been studied previously in the mathematical literature on turbu
lence. Our purpose is to explore the implications of the symmetries and en
ergy bounds of this resonant system\, previously studied for the classical
case\, for the quantum level splitting. Simplifications in computing the
splitting spectrum numerically result from exploiting the symmetries. The
highest energy state emanating from each unperturbed level is explicitly d
escribed by our analytics. We furthermore discuss the energy-level spacing
distributions in the spirit of quantum chaos theory. After separating the
eigenvalues into blocks with respect to the known conservation laws\, we
observe the Wigner Dyson statistics within specific large blocks\, which l
eaves little room for further integrable structures in the problem beyond
the symmetries that are already explicitly known.\n\nhttps://indico.tifr.r
es.in/indico/conferenceDisplay.py?confId=7508
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7508
END:VEVENT
BEGIN:VEVENT
SUMMARY:Interacting Gravity waves\; Semiclassical Image of the Event Horiz
on
DTSTART;VALUE=DATE-TIME:20191230T060000Z
DTEND;VALUE=DATE-TIME:20191230T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7539@cern.ch
DESCRIPTION:This talk has two parts: (i) We examine the interaction of gra
vity waves with scalar and neutrino fields and find a new propagating mode
in the perturbed fields. We discuss the implications of the results for g
ravity wave detection on Earth\, cosmic neutrino background and multimesse
nger astronomy. (ii) We study semiclassical corrections to the recently d
iscovered event horizon telescope image of a black hole. We find that desp
ite the Planck length origins of the corrections\, there are tangible corr
ections to the photon orbits\, which might be detected in future sensitive
images of the event horizon.\n\nhttps://indico.tifr.res.in/indico/confere
nceDisplay.py?confId=7539
LOCATION:
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7539
END:VEVENT
BEGIN:VEVENT
SUMMARY:A new independent analysis of LIGO data: methods and results
DTSTART;VALUE=DATE-TIME:20191230T090000Z
DTEND;VALUE=DATE-TIME:20191230T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7545@cern.ch
DESCRIPTION:The Advanced LIGO and VIRGO observatories detected several gra
vitational-wave events in their first and second observing runs from 2015
to 2017. The detections were only possible due to sophisticated analyses o
f noisy strain data that were historically conducted within the collaborat
ion. Recently\, we developed an entirely independent analysis of LIGO data
that improved its reach by rigorously accounting for inherent systematics
\, and thereby identified nine new binary black-hole mergers within\, incl
uding an event with the highest spin reported to date. In this talk\, I wi
ll provide a birds-eye view of the process used to make these detections.\
n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7545
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7545
END:VEVENT
BEGIN:VEVENT
SUMMARY: A Non-Supersymmetric 5d Fixed Point?
DTSTART;VALUE=DATE-TIME:20191231T060000Z
DTEND;VALUE=DATE-TIME:20191231T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7552@cern.ch
DESCRIPTION:The question mark in the title is important.\n\nhttps://indico
.tifr.res.in/indico/conferenceDisplay.py?confId=7552
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7552
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phase Transitions of a (Super) Quantum Mechanical Matrix Model wi
th a Chemical Potential in terms of partial deconfinement
DTSTART;VALUE=DATE-TIME:20200102T090000Z
DTEND;VALUE=DATE-TIME:20200102T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7559@cern.ch
DESCRIPTION:We study the finite-temperature matrix quantum mechanics with/
without chemical potential term linear in the single trace of U(N) matrice
s\, via Monte Carlo simulation. We study the nature of the phase transitio
n of the models\, and discuss the relation with the "partial deconfinement
.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7559
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7559
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chern-Simons field theory invariants\, volume conjecture & topolog
ical entanglement
DTSTART;VALUE=DATE-TIME:20200106T090000Z
DTEND;VALUE=DATE-TIME:20200106T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7563@cern.ch
DESCRIPTION:I will briefly discuss our progress on obtaining polynomial in
variants of knots and links\, relations to hyperbolic volume and its relev
ance in multi-boundary entanglement structures.\n\nhttps://indico.tifr.res
.in/indico/conferenceDisplay.py?confId=7563
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7563
END:VEVENT
BEGIN:VEVENT
SUMMARY:QNMs of SUSY Microstate Geometries and D1-D5 CFT (Quantum Spacetim
e Seminar)
DTSTART;VALUE=DATE-TIME:20200113T060000Z
DTEND;VALUE=DATE-TIME:20200113T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7569@cern.ch
DESCRIPTION:In this talk\, I will highlight differences between decay beha
viour of linear fields on SUSY fuzzballs and SUSY black holes. I will argu
e that SUSY fuzzballs seem to be classically unstable (Eperon\, Reall\, Sa
ntos non-linear instability) and I will discuss what we can learn about it
from the D1-D5 CFT.\n\nhttps://indico.tifr.res.in/indico/conferenceDispla
y.py?confId=7569
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7569
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tauberian Theorems and High Energy Asymptotics in CFT (Quantum Spa
cetime Seminar)
DTSTART;VALUE=DATE-TIME:20200120T060000Z
DTEND;VALUE=DATE-TIME:20200120T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7589@cern.ch
DESCRIPTION:We analyze the universal asymptotic behaviour of CFT data usin
g techniques inspired from Tauberian theorems appearing in the context of
analyzing divergent series. I will be focussing on 2D CFT where we can als
o leverage the Modular invariance of the torus partition function. Blendin
g Tauberian techniques and Modular invariance enables us to prove spin sen
sitive Cardy formula rigorously with an optimal error estimate. We also pr
obe the finer details of asymptotic behaviour of the density of states\, O
PE coefficient and prove asymptotic bounds on the spectral gap. We comment
on how generic and powerful Tauberian theorems can potentially be in anal
yzing the asymptotic data in any dimensional CFT.\n\nhttps://indico.tifr.r
es.in/indico/conferenceDisplay.py?confId=7589
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7589
END:VEVENT
BEGIN:VEVENT
SUMMARY:No Tension! - The Carefree Life of Null Strings
DTSTART;VALUE=DATE-TIME:20200127T090000Z
DTEND;VALUE=DATE-TIME:20200127T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7601@cern.ch
DESCRIPTION:In this talk\, I will present an introduction to a particular
enigmatic limit of string theory\, the tensionless regime. This is particu
larly important to understand the very high energy sector of string theory
which has been conjectured to display a lot of extra symmetry and holds t
he key to the mysterious Hagedorn phase of strings. I will present some re
cent starting findings where we find an open string emerging from a closed
string as the tension is dialed to zero.\n\nhttps://indico.tifr.res.in/in
dico/conferenceDisplay.py?confId=7601
LOCATION: AG66
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7601
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modular Theory and QFT (Tata-Infosys Lecture Series) [Lecture 1]
DTSTART;VALUE=DATE-TIME:20200127T060000Z
DTEND;VALUE=DATE-TIME:20200127T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7602@cern.ch
DESCRIPTION:We introduce the Tomita-Takesaki modular theory and discuss it
s applications to quantum field theory (QFT). We use the modular theory to
constrain the correlation functions of quantum fields. Using modular theo
ry we prove that in QFT\, as opposed to finite quantum systems\, there are
no obstructions on sewing local states into a global pure state.\n\nhttps
://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7602
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7602
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modular Theory and QFT (Tata-Infosys Lecture Series) [Lecture 2]
DTSTART;VALUE=DATE-TIME:20200129T083000Z
DTEND;VALUE=DATE-TIME:20200129T093000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7603@cern.ch
DESCRIPTION:We introduce the Tomita-Takesaki modular theory and discuss it
s applications to quantum field theory (QFT). We use the modular theory to
constrain the correlation functions of quantum fields. Using modular theo
ry we prove that in QFT\, as opposed to finite quantum systems\, there are
no obstructions on sewing local states into a global pure state.\n\nhttps
://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7603
LOCATION: AG69
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7603
END:VEVENT
BEGIN:VEVENT
SUMMARY:Modular Theory and QFT (Tata-Infosys Lecture Series) [Lecture 3]
DTSTART;VALUE=DATE-TIME:20200130T060000Z
DTEND;VALUE=DATE-TIME:20200130T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7604@cern.ch
DESCRIPTION:We introduce the Tomita-Takesaki modular theory and discuss it
s applications to quantum field theory (QFT). We use the modular theory to
constrain the correlation functions of quantum fields. Using modular theo
ry we prove that in QFT\, as opposed to finite quantum systems\, there are
no obstructions on sewing local states into a global pure state.\n\nhttps
://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7604
LOCATION: AG66
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7604
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Mechanics of Plancherel Growth (Quantum Spacetime Seminar
Series)
DTSTART;VALUE=DATE-TIME:20200203T060000Z
DTEND;VALUE=DATE-TIME:20200203T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7616@cern.ch
DESCRIPTION:Growth of Young diagrams\, equipped with Plancherel measure\,
follows the automodel equation of Kerov. Using the technology of unitary m
atrix model I will show that such growth process is exactly the same as th
e growth of gap less phase of Gross-Witten and Wadia (GWW) model. The anal
ysis offers an alternate proof of limit shape theorem of Vershik-Kerov and
Logan-Shepp. I will discuss about large N fluctuations of Young diagrams.
Quantization of fluctuations using Hamiltonian dynamics shows that the mo
des of fluctuations satisfy an abelian Kac-Moody algebra. Eventually\, I w
ill propose a correspondence between states of Hilbert space and automodel
diagrams\, inspired by the quantization procedure.\n\nhttps://indico.tifr
.res.in/indico/conferenceDisplay.py?confId=7616
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7616
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eigenstate Thermalization and Virasoro Symmetry (Quantum Spacetime
seminar Series)
DTSTART;VALUE=DATE-TIME:20200210T060000Z
DTEND;VALUE=DATE-TIME:20200210T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7635@cern.ch
DESCRIPTION:Two-dimensional conformal field theories have an infinite numb
er of conserved charges and\, at the same time\, are dual to 3d gravity wh
ich admits black hole solutions. This leads to a puzzle on how the thermal
ization process can occur. We address universal aspects of this question w
hich can be leveraged by using Virasoro symmetry alone. It turns out that
matrix elements of light probes in typical high-energy descendant states h
ave the right properties to ensure compatibility with the weak version of
the Eigenstate Thermalization Hypothesis (ETH). The tools developed along
the way also enable us to directly prove the property of conformal blocks
exponentiating in the semi-classical regime.\n\nhttps://indico.tifr.res.in
/indico/conferenceDisplay.py?confId=7635
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7635
END:VEVENT
BEGIN:VEVENT
SUMMARY: Loop Level Soft Photon Theorem as a Ward Identity (Quantum Space
time seminar Series)
DTSTART;VALUE=DATE-TIME:20200217T060000Z
DTEND;VALUE=DATE-TIME:20200217T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7659@cern.ch
DESCRIPTION:Soft theorems are statements about low energy limit of amplitu
des. Interestingly\, tree level soft theorems can be related to asymptotic
conservation laws. The leading soft photon theorem is an exact quantum st
atement but subleading soft theorems receive non-trivial loop corrections.
An interesting question to probe is whether these corrections originate
from loop corrected asymptotic charges. In this spirit\, Laddha and Campig
lia proposed a new conservation law corresponding to the (loop level) Saho
o-Sen soft photon theorem. Our aim is to study construct these charges for
massless scalar QED in presence of dynamical gravity. The terms in the lo
op level asymptotic charge are directly related to the dressing of fields
due to long range forces. In presence of gravity\, the new feature is that
the soft photon also acquires a dressing due to long range gravitational
force and contributes to the charge. We finally show that the correspondin
g Ward identity is equivalent to the Sahoo-Sen soft photon theorem.\n\nhtt
ps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7659
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7659
END:VEVENT
BEGIN:VEVENT
SUMMARY:D-instanton Perturbation Theory (Tata - Infosys Lecture Series) (L
ecture - 1)
DTSTART;VALUE=DATE-TIME:20200224T060000Z
DTEND;VALUE=DATE-TIME:20200224T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7676@cern.ch
DESCRIPTION:D-instanton world-volume theory has open string zero modes des
cribing collective coordinates of the instanton. The usual perturbative am
plitudes in the D-instanton background suffer from infra-red divergences d
ue to the presence of these zero modes\, and the usual approach of analyti
c continuation in momenta does not work since all open string states on a
D - instanton carry strictly zero momentum. String field theory is well-su
ited for tackling these issues. However there is a new subtlety due to the
existence of additional zero modes in the ghost sector. This causes a bre
akdown of the Siegel gauge\, but a different gauge fixing consistent with
the BV formalism renders the perturbation theory finite and unambiguous. A
t each order\, this produces extra contribution to the amplitude besides w
hat is obtained from integration over the moduli space of Riemann surfaces
.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7676
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7676
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravity from Quantum Entanglement in the AdS/CFT Correspondence (Q
uantum Spacetime seminar Series) (Part II)
DTSTART;VALUE=DATE-TIME:20200225T060000Z
DTEND;VALUE=DATE-TIME:20200225T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7687@cern.ch
DESCRIPTION:We will argue that any asymptotically AdS spacetime which comp
utes the entanglement entropies of a CFT state with the Ryu-Takayanagi (RT
) formula must necessarily satisfy the fully non-linear Einstein equation.
At a technical level\, our strategy involves studying the shape-dependenc
e of entanglement entropy for arbitrary states and (simple connected) subr
egions in holographic conformal field theories. It is typically hard to wo
rk with general states/subregions without relying on symmetries\, but we w
ill combine field-theory and gravitational techniques to make progress. Ou
r results show that gravitational dynamics emerges from the structure of e
ntanglement in the dual CFT. This analysis also leads to a new quasi-Loren
tzian proof (without using the replica trick) of the RT formula and sugges
ts that RT is a natural consequence of matching between a certain bulk and
boundary "algebraic" symmetry called modular flow.\n\nhttps://indico.tifr
.res.in/indico/conferenceDisplay.py?confId=7687
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7687
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalised Coherent States in QCD from Asymptotic Symmetries (Qua
ntum Spacetime seminar Series)
DTSTART;VALUE=DATE-TIME:20200226T090000Z
DTEND;VALUE=DATE-TIME:20200226T100000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7680@cern.ch
DESCRIPTION:Ward Identity related to the asymptotic symmetry of S matrix p
lays an important role in understanding the infrared structure of gauge th
eory and gravity. However\, the S matrix is infrared divergent in four dim
ensions due to massless particles in the theory. Faddeev and Kulish have d
eveloped a formalism to construct infrared finite S matrix by working with
asymptotic states instead of Fock states. In this talk\, I will discuss t
he Ward identity in these asymptotic states in the context of QCD.\n\nhttp
s://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7680
LOCATION: AG66
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7680
END:VEVENT
BEGIN:VEVENT
SUMMARY:D-instanton Perturbation Theory (Tata - Infosys Lecture Series) (L
ecture - 2)
DTSTART;VALUE=DATE-TIME:20200227T053000Z
DTEND;VALUE=DATE-TIME:20200227T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7677@cern.ch
DESCRIPTION:D-instanton world-volume theory has open string zero modes des
cribing collective coordinates of the instanton. The usual perturbative am
plitudes in the D-instanton background suffer from infra-red divergences d
ue to the presence of these zero modes\, and the usual approach of analyti
c continuation in momenta does not work since all open string states on a
D - instanton carry strictly zero momentum. String field theory is well-su
ited for tackling these issues. However there is a new subtlety due to the
existence of additional zero modes in the ghost sector. This causes a bre
akdown of the Siegel gauge\, but a different gauge fixing consistent with
the BV formalism renders the perturbation theory finite and unambiguous. A
t each order\, this produces extra contribution to the amplitude besides w
hat is obtained from integration over the moduli space of Riemann surfaces
.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7677
LOCATION: AG66
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7677
END:VEVENT
BEGIN:VEVENT
SUMMARY:D-instanton Perturbation Theory (Tata - Infosys Lecture Series) (L
ecture - 3)
DTSTART;VALUE=DATE-TIME:20200228T043000Z
DTEND;VALUE=DATE-TIME:20200228T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7678@cern.ch
DESCRIPTION:D-instanton world-volume theory has open string zero modes des
cribing collective coordinates of the instanton. The usual perturbative am
plitudes in the D-instanton background suffer from infra-red divergences d
ue to the presence of these zero modes\, and the usual approach of analyti
c continuation in momenta does not work since all open string states on a
D - instanton carry strictly zero momentum. String field theory is well-su
ited for tackling these issues. However there is a new subtlety due to the
existence of additional zero modes in the ghost sector. This causes a bre
akdown of the Siegel gauge\, but a different gauge fixing consistent with
the BV formalism renders the perturbation theory finite and unambiguous. A
t each order\, this produces extra contribution to the amplitude besides w
hat is obtained from integration over the moduli space of Riemann surfaces
.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7678
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7678
END:VEVENT
BEGIN:VEVENT
SUMMARY:Deriving the AdS_{3}/CFT_{2} Correspondence (Tata-
Infosys Lectures Series) [Lecture 1]
DTSTART;VALUE=DATE-TIME:20200302T060000Z
DTEND;VALUE=DATE-TIME:20200302T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7696@cern.ch
DESCRIPTION:The AdS/CFT correspondence still retains its magical flavour a
fter two decades because it equates two apparently unrelated theoretical e
ntities. Namely\, a theory of quantum gravity on Anti de Sitter (AdS) spac
etimes and conformal field theories (CFT) on their boundary. In these talk
s we will take some steps towards a nuts and bolts understanding of how th
is connection really works. We will do this in the context of a specific e
xample that relates a tensionless limit of an AdS_3 string theory with a 2
d CFT known as the symmetric product orbifold CFT. First we argue that the
spectrum of physical states nontrivially agrees on both sides of this dua
lity. We then go on to give arguments which establish how we can recast al
l physical correlators on the string theory as boundary correlators of the
2d CFT. This bypasses any need for explicit calculation but instead makes
manifest the relation between the two sets of quantities. The resulting p
icture suggests an underlying topological string as the right starting poi
nt for a perturbative expansion. This may be a universal feature even of t
he higher dimensional examples of the AdS/CFT duality and in the spirit of
an old program to recast large N perturbative field theories as string th
eories.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7
696
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7696
END:VEVENT
BEGIN:VEVENT
SUMMARY:Deriving the AdS_{3}/CFT_{2} Correspondence (Tata-
Infosys Lectures Series) [Lecture 2]
DTSTART;VALUE=DATE-TIME:20200303T043000Z
DTEND;VALUE=DATE-TIME:20200303T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7697@cern.ch
DESCRIPTION:The AdS/CFT correspondence still retains its magical flavour a
fter two decades because it equates two apparently unrelated theoretical e
ntities. Namely\, a theory of quantum gravity on Anti de Sitter (AdS) spac
etimes and conformal field theories (CFT) on their boundary. In these talk
s we will take some steps towards a nuts and bolts understanding of how th
is connection really works. We will do this in the context of a specific e
xample that relates a tensionless limit of an AdS_3 string theory with a 2
d CFT known as the symmetric product orbifold CFT. First we argue that the
spectrum of physical states nontrivially agrees on both sides of this dua
lity. We then go on to give arguments which establish how we can recast al
l physical correlators on the string theory as boundary correlators of the
2d CFT. This bypasses any need for explicit calculation but instead makes
manifest the relation between the two sets of quantities. The resulting p
icture suggests an underlying topological string as the right starting poi
nt for a perturbative expansion. This may be a universal feature even of t
he higher dimensional examples of the AdS/CFT duality and in the spirit of
an old program to recast large N perturbative field theories as string th
eories.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7
697
LOCATION: A304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7697
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dispersion Relation in Conformal Field Theory (Quantum Spacetime s
eries seminar)
DTSTART;VALUE=DATE-TIME:20200309T083000Z
DTEND;VALUE=DATE-TIME:20200309T093000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7706@cern.ch
DESCRIPTION:We propose a dispersion relation in conformal field theory whi
ch expresses the four point correlator as an integral over its single di
scontinuity. Exploiting the analytic properties and crossing symmetry of
the correlator\, we show that in erturbative settings the correlator depe
nds only on the spectrum of the theory\, as well as the OPE coefficient
s of certain low twist operators and can be reconstructed nambiguously.
As an application\, the correlator < Φ Φ Φ Φ > in Φ4 theor
y at the Wilson-Fisher fixed point can be computed in closed form up to
order ε2 in the ε expansion. At small coupling this can be thought of a
s an alternative way of computing the CFT correlators with some inputs us
ing Feynman diagrams.\n\nhttps://indico.tifr.res.in/indico/conferenceDispl
ay.py?confId=7706
LOCATION: AG 66
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7706
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Complexity Characteristics of Bulk Gravitational Singulari
ties (Quantum Spacetime seminar Series)
DTSTART;VALUE=DATE-TIME:20200309T060000Z
DTEND;VALUE=DATE-TIME:20200309T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-7707@cern.ch
DESCRIPTION:The theory of Quantum Information & Computation (QIC) is incre
asingly playing a key role in AdS/CFT\, and holography in general\, on unc
overing how local bulk geometry is coded in quantum mechanical correlation
s of the dual quantum field theories. Computational Complexity of a quantu
m system\, including CFT's\, is one such concept from the QIC literature w
hich has been touted by Susskind to play a crucial role in understanding b
lack hole interior which is otherwise very hard to access through traditio
nal CFT probes/observables such as correlation functions. This has led to
the Complexity-Volumes (CV) and Complexity-Action (CA) conjectures\, two n
ew entries in the holographic dictionary which have been extensively studi
ed in the recent literature. In the recent past work\, we had looked at ho
w bulk gravitational spacelike singularities show up in the complexity of
the dual CFT state using the C-V and C-A conjectures and observed some bro
ad features and some even more curious differences. In the present work\,
we turn our attention to some test cases of timelike singularities in the
bulk\, some old and some novel ones recently obtained by one of us in work
related to EDM system in AdS/CMT context. We exclusively work with the CA
conjecture\, and compare our findings to some existing claims/statements
about bulk time like\nsingularities in terms of the dual field theory (Gub
ser criterion).\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?
confId=7707
LOCATION: A 304
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=7707
END:VEVENT
BEGIN:VEVENT
SUMMARY:An Effective Action for Infrared Divergences
DTSTART;VALUE=DATE-TIME:20220907T053000Z
DTEND;VALUE=DATE-TIME:20220907T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-8538@cern.ch
DESCRIPTION:The S-matrix of non-confining gauge and gravitational theories
in four dimensions (bulk) are plagued with infrared divergences. In this
talk\, I will construct an effective two-dimensional (boundary) action who
se correlators exactly reproduce this infrared divergence structure exactl
y. We will then use this construction to define an S-matrix which is infra
red finite.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?conf
Id=8538
LOCATION:Zoom A369
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=8538
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finiteness of Entanglement Entropy in Collective Field Theory
DTSTART;VALUE=DATE-TIME:20221130T053000Z
DTEND;VALUE=DATE-TIME:20221130T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-8702@cern.ch
DESCRIPTION:In usual quantum field theories the entanglement entropy of a
region is UV divergent. We explore the question of whether such quantity\,
if properly defined\, could be finite in string theory. In examples of ho
lography where the emergent space comes from the target space of a usual q
uantum field theory such a definition is possible. I will review a calcula
tion of this target space entanglement entropy in the c=1 Matrix Model. T
he result is finite\, and easily understood from the matrix model point of
view\, but somewhat mysterious from the closed string point of view since
the scale which makes the quantity finite is the string coupling. In thi
s talk I will describe how this finiteness is a non-perturbative property
of the collective field theory which is related to the closed string desc
ription.\n\nhttps://indico.tifr.res.in/indico/conferenceDisplay.py?confId=
8702
LOCATION: A304 and on Zoom
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=8702
END:VEVENT
BEGIN:VEVENT
SUMMARY:Understanding recent progress on the black hole information loss p
aradox (Tata-Infosys Lectures [Lecture 1])
DTSTART;VALUE=DATE-TIME:20230131T050000Z
DTEND;VALUE=DATE-TIME:20230131T060000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-8788@cern.ch
DESCRIPTION:We can give two very different descriptions of the evolution o
f a black hole formed from the collapse of a star. On the one hand\, we ha
ve an "effective" description from quantum field theory on the black hole
geometry: in this picture\, the time-evolution appears to violate unitarit
y\, leading to information loss. On the other hand\, in its "fundamental"
description\, the black hole can be treated as a chaotic quantum many-body
system with unitary time-evolution. It was previously expected that going
from the effective to the fundamental picture would require highly non-tr
ivial inputs from string theory. However\, it has recently been found that
simple prescriptions called islands and replica wormholes allow us to us
e the effective description to deduce the unitary time-evolution in the fu
ndamental description.\n\nIn this lecture series\, I will present two ways
of understanding the origin of these prescriptions. In one perspective\,
based on arXiv: 2008.01089\, the black hole information loss paradox can b
e seen as an example of an apparent paradox in any thermalizing quantum ma
ny-body\nsystem. The replica wormhole prescription then comes from the uni
versal resolution of this paradox in quantum many-body systems. In the sec
ond perspective\, based on arXiv: 2207.06536\, we understand the island fo
rmula in terms of properties of the holographic map from the effective to
the fundamental description. In contrast to the holographic map in setups
without a black hole\, this map is not an isometry\, but still has certain
error-correction properties which allow us to express quantities in the f
undamental description using\nthose in the effective description.\n\nhttps
://indico.tifr.res.in/indico/conferenceDisplay.py?confId=8788
LOCATION: A304 and Zoom
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=8788
END:VEVENT
BEGIN:VEVENT
SUMMARY:Understanding recent progress on the black hole information loss p
aradox (Tata-Infosys Lectures [Lecture 2])
DTSTART;VALUE=DATE-TIME:20230201T053000Z
DTEND;VALUE=DATE-TIME:20230201T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-8789@cern.ch
DESCRIPTION:We can give two very different descriptions of the evolution o
f a black hole formed from the collapse of a star. On the one hand\, we ha
ve an "effective" description from quantum field theory on the black hole
geometry: in this picture\, the time-evolution appears to violate unitarit
y\, leading to information loss. On the other hand\, in its "fundamental"
description\, the black hole can be treated as a chaotic quantum many-body
system with unitary time-evolution. It was previously expected that going
from the effective to the fundamental picture would require highly non-tr
ivial inputs from string theory. However\, it has recently been found that
simple prescriptions called islands and replica wormholes allow us to us
e the effective description to deduce the unitary time-evolution in the fu
ndamental description.\n\nIn this lecture series\, I will present two ways
of understanding the origin of these prescriptions. In one perspective\,
based on arXiv: 2008.01089\, the black hole information loss paradox can b
e seen as an example of an apparent paradox in any thermalizing quantum ma
ny-body\nsystem. The replica wormhole prescription then comes from the uni
versal resolution of this paradox in quantum many-body systems. In the sec
ond perspective\, based on arXiv: 2207.06536\, we understand the island fo
rmula in terms of properties of the holographic map from the effective to
the fundamental description. In contrast to the holographic map in setups
without a black hole\, this map is not an isometry\, but still has certain
error-correction properties which allow us to express quantities in the f
undamental description using\nthose in the effective description.\n\nhttps
://indico.tifr.res.in/indico/conferenceDisplay.py?confId=8789
LOCATION: A304 and Zoom
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=8789
END:VEVENT
BEGIN:VEVENT
SUMMARY:Understanding recent progress on the black hole information loss p
aradox (Tata-Infosys Lectures [Lecture 3])
DTSTART;VALUE=DATE-TIME:20230202T043000Z
DTEND;VALUE=DATE-TIME:20230202T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-8790@cern.ch
DESCRIPTION:We can give two very different descriptions of the evolution o
f a black hole formed from the collapse of a star. On the one hand\, we ha
ve an "effective" description from quantum field theory on the black hole
geometry: in this picture\, the time-evolution appears to violate unitarit
y\, leading to information loss. On the other hand\, in its "fundamental"
description\, the black hole can be treated as a chaotic quantum many-body
system with unitary time-evolution. It was previously expected that going
from the effective to the fundamental picture would require highly non-tr
ivial inputs from string theory. However\, it has recently been found that
simple prescriptions called islands and replica wormholes allow us to us
e the effective description to deduce the unitary time-evolution in the fu
ndamental description.\n\nIn this lecture series\, I will present two ways
of understanding the origin of these prescriptions. In one perspective\,
based on arXiv: 2008.01089\, the black hole information loss paradox can b
e seen as an example of an apparent paradox in any thermalizing quantum ma
ny-body\nsystem. The replica wormhole prescription then comes from the uni
versal resolution of this paradox in quantum many-body systems. In the sec
ond perspective\, based on arXiv: 2207.06536\, we understand the island fo
rmula in terms of properties of the holographic map from the effective to
the fundamental description. In contrast to the holographic map in setups
without a black hole\, this map is not an isometry\, but still has certain
error-correction properties which allow us to express quantities in the f
undamental description using\nthose in the effective description.\n\nhttps
://indico.tifr.res.in/indico/conferenceDisplay.py?confId=8790
LOCATION: A304 and Zoom
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=8790
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitational Holography and Tensor Networks: A Quantum Informatio
n Perspective (Tata Infosys Lecture 1)
DTSTART;VALUE=DATE-TIME:20230228T053000Z
DTEND;VALUE=DATE-TIME:20230228T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-8825@cern.ch
DESCRIPTION:These lectures are intended to give a flavour of ideas from qu
antum information theory that have helped shed light on our understanding
of quantum gravity\, especially in the setting of AdS/CFT. In the first le
cture\, we will discuss random tensor networks as a toy model for holograp
hy\, and make sharp connections with the gravitational path integral using
the idea of fixed-area states. In the second lecture\, we will discuss ap
plications of tensor network techniques to holographic systems\, especiall
y in the context of understanding multipartite entanglement measures such
as the reflected entropy and entanglement negativity. Finally\, in the thi
rd lecture\, we will discuss shortcomings of tensor networks as toy models
\, especially with regard to time dependence. We will use ideas from quant
um information theory such as modular flow to attempt to bridge the gap be
tween tensor networks and holography.\n\nhttps://indico.tifr.res.in/indico
/conferenceDisplay.py?confId=8825
LOCATION: A304 and on zoom
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=8825
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitational Holography and Tensor Networks: A Quantum Informatio
n Perspective (Tata Infosys Lecture 2)
DTSTART;VALUE=DATE-TIME:20230301T053000Z
DTEND;VALUE=DATE-TIME:20230301T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-8827@cern.ch
DESCRIPTION:These lectures are intended to give a flavour of ideas from qu
antum information theory that have helped shed light on our understanding
of quantum gravity\, especially in the setting of AdS/CFT. In the first le
cture\, we will discuss random tensor networks as a toy model for holograp
hy\, and make sharp connections with the gravitational path integral using
the idea of fixed-area states. In the second lecture\, we will discuss ap
plications of tensor network techniques to holographic systems\, especiall
y in the context of understanding multipartite entanglement measures such
as the reflected entropy and entanglement negativity. Finally\, in the thi
rd lecture\, we will discuss shortcomings of tensor networks as toy models
\, especially with regard to time dependence. We will use ideas from quant
um information theory such as modular flow to attempt to bridge the gap be
tween tensor networks and holography.\n\nhttps://indico.tifr.res.in/indico
/conferenceDisplay.py?confId=8827
LOCATION: A304 and on zoom
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=8827
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitational Holography and Tensor Networks: A Quantum Informatio
n Perspective (Tata Infosys Lecture 3)
DTSTART;VALUE=DATE-TIME:20230302T043000Z
DTEND;VALUE=DATE-TIME:20230302T053000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-8828@cern.ch
DESCRIPTION:These lectures are intended to give a flavour of ideas from qu
antum information theory that have helped shed light on our understanding
of quantum gravity\, especially in the setting of AdS/CFT. In the first le
cture\, we will discuss random tensor networks as a toy model for holograp
hy\, and make sharp connections with the gravitational path integral using
the idea of fixed-area states. In the second lecture\, we will discuss ap
plications of tensor network techniques to holographic systems\, especiall
y in the context of understanding multipartite entanglement measures such
as the reflected entropy and entanglement negativity. Finally\, in the thi
rd lecture\, we will discuss shortcomings of tensor networks as toy models
\, especially with regard to time dependence. We will use ideas from quant
um information theory such as modular flow to attempt to bridge the gap be
tween tensor networks and holography.\n\nhttps://indico.tifr.res.in/indico
/conferenceDisplay.py?confId=8828
LOCATION: A304 and on zoom
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=8828
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constructing Scattering Amplitudes [Tata-Infosys Lectures Series]
(Lecture 2)
DTSTART;VALUE=DATE-TIME:20230315T053000Z
DTEND;VALUE=DATE-TIME:20230315T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-8847@cern.ch
DESCRIPTION:One of the main observables in particle physics is scattering
amplitudes. The traditional approach to calculating scattering amplitudes
involves summing over a combinatorially large number of Feynman diagrams o
f increasing complexity. Despite this\, the final answer is often relative
ly simple in theories with symmetry. In this lecture series\, we discuss h
ow symmetries like electromagnetic duality\, non-linearly realized symmetr
ies\, color-kinematic duality and positive geometry affect amplitudes. We
introduce modern symmetry-driven techniques like recursion relations\, gen
eralized unitarity\, Grassmannian geometry and the double copy to study sc
attering in a variety of special theories like Born-Infeld\, Yang-Mills an
d chiral perturbation theories.\n\nhttps://indico.tifr.res.in/indico/confe
renceDisplay.py?confId=8847
LOCATION: A369 and on Zoom
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=8847
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Crossed Product Construction from Holographic Quantum Error-Co
rrecting Codes
DTSTART;VALUE=DATE-TIME:20230316T053000Z
DTEND;VALUE=DATE-TIME:20230316T063000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-8854@cern.ch
DESCRIPTION:Recently\, the old observation that the generalised entropy of
a horizon --- the sum of the area and the entropy of exterior fields ---
is better defined than either of the objects that make it up has been put
on firmer footing by Witten et al. The main observation is that including
fluctuations in the ADM charges in the algebra of matter fields changes th
e type of algebra from type III_1 --- which doesn't have an entropy functi
on --- to type II --- which does --- using the crossed product constructio
n. We show that a holographic quantum error-correcting (QEC) code naturall
y has a structure analogous to the crossed product. When the encoded algeb
ra is type I\, we show that ‘boundary modular flow’ in the code makes
it into a direct sum of type I factors. In the limit where we take the enc
oded algebra towards a type III_1 algebra\, a certain recasting of the dir
ect sum becomes a type II algebra. We are able to recover both type II_\\i
nfty --- relevant for black holes --- as well as type II_1 algebras -- rel
evant for cosmological horizons in de Sitter space --- by imposing differe
nt constraints on the area operator in the code. These results indicate th
at the holographic QEC code might be useful in contexts where the 'boundar
y' is actually an observer\, like the static patch of de Sitter.\n\nhttps:
//indico.tifr.res.in/indico/conferenceDisplay.py?confId=8854
LOCATION: A304 and on zoom
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=8854
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constructing Scattering Amplitudes [Tata-Infosys Lectures Series]
(Lecture 3)
DTSTART;VALUE=DATE-TIME:20230317T053000Z
DTEND;VALUE=DATE-TIME:20230317T070000Z
DTSTAMP;VALUE=DATE-TIME:20230326T125017Z
UID:indico-event-8848@cern.ch
DESCRIPTION:One of the main observables in particle physics is scattering
amplitudes. The traditional approach to calculating scattering amplitudes
involves summing over a combinatorially large number of Feynman diagrams o
f increasing complexity. Despite this\, the final answer is often relative
ly simple in theories with symmetry. In this lecture series\, we discuss h
ow symmetries like electromagnetic duality\, non-linearly realized symmetr
ies\, color-kinematic duality and positive geometry affect amplitudes. We
introduce modern symmetry-driven techniques like recursion relations\, gen
eralized unitarity\, Grassmannian geometry and the double copy to study sc
attering in a variety of special theories like Born-Infeld\, Yang-Mills an
d chiral perturbation theories.\n\nhttps://indico.tifr.res.in/indico/confe
renceDisplay.py?confId=8848
LOCATION: A369 and on Zoom
URL:https://indico.tifr.res.in/indico/conferenceDisplay.py?confId=8848
END:VEVENT
END:VCALENDAR