String Theory Seminars
Moulting Black Holes (SUSY and non SUSY)
by Dr. Borun Chowdhury (Utrecht University)
Wednesday, October 19, 2011
from
to
(Asia/Kolkata)
at Colaba Campus ( A304 )
at Colaba Campus ( A304 )
Description |
We first find a family of novel supersymmetric phases of the D1-D5 CFT, which in certain ranges of charges have more entropy than all known ensembles. We also find bulk BPS configurations that exist in the same range of parameters as these phases, and have more entropy than a BMPV black hole; they can be thought of as coming from a BMPV black hole shedding a “hair†condensate outside of the horizon. The entropy of the bulk configurations is smaller than that of the CFT phases, which indicates that some of the CFT states are lifted at strong coupling. Neither the bulk nor the boundary phases are captured by the elliptic genus, which makes the coincidence of the phase boundaries particularly remarkable. Our configurations are the first instance of a black hole entropy enigma with a controlled CFT dual. Furthermore, contrary to common lore, these objects exist in a region of parameter space (between the ``cosmic censorship bound'' and the ``unitarity bound'') where no black holes were thought to exist. Motivated by this we expect stable bound states of non-extremal rotating three-charge black holes in five dimensions (Cvetic-Youm black holes) and super tubes. We study the system in the probe limit and find that generically the susy marginal bound state becomes metastable and disappears with non-extremality. However near extremality our expectation is realized and there are stable bound states. Angular momentum repulsion is mainly responsible for this effect. We use this setup in the D1-D5 decoupling limit to map a thermodynamic instability of the CFT (from BH phase to new phase) to a dynamical instability of BH to the supertube-BH bound state. |