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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:20171022T024548Z
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
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