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Bert Vercnocke08/06/2020 12:00
Recorded version: http://www.youtube.com/watch?v=bSJS8yWdnrA
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Daniel Mayerson08/06/2020 14:30
Microstates of the three-charge D1-D5-P black hole - superstrata - are complicated solutions in 6D supergravity. I will discuss two ways to make Marie Kondo proud by "decluttering" and simplifying these solutions. First, by a clever choice of complex variables, one can quickly generalize the existing (single mode) superstrata to contain arbitrary holomorphic functions of these variables....
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Samir Mathur08/06/2020 16:00
We consider three fundamental issues in quantum gravity: (a) the black hole information paradox (b) the unboundedness of entropy that can be stored inside a black hole horizon (c) the relation between the black hole horizon and the cosmological horizon. With help from the small corrections theorem, we convert each of these issues into a sharp conflict. We then argue that all three conflicts...
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Andrea Puhm, Geoffrey Compère, Malcolm Perry08/06/2020 17:45
Moderator: Guillaume Bossard
Recorded discussion: https://www.youtube.com/watch?v=NtQJsSiv4Fw
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Jose Morales09/06/2020 12:00
We study the scattering of massless probes in the vicinity of the photon-sphere of asymptotically AdS/flat black holes and horizon-free microstate geometries (fuzzballs). We find that these exhibit a chaotic behaviour characterised by exponentially large deviations of nearby trajectories and compute the Lyapunov exponent \lambda governing the exponential growth. We find that fuzzballs and...
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Pierre Heidmann09/06/2020 14:30
We discuss the quasi-normal modes in asymptotically-flat microstate geometries that have the same charge as a D1-D5-P black hole, but whose long BTZ-like throat ends in a smooth cap. In general the wave equation is not separable, but we find a class of geometries in which the non-separable term is negligible and we can compute the quasi-normal frequencies using WKB methods. The long throats of...
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Emil Martinec09/06/2020 16:00
We explore the stringy structure of 1/2-BPS states in little string theory and its AdS3 limit using worldsheet techniques. Duality in the worldsheet theory maps the geometrical (Lunin-Mathur) description of these states to a non-compact Landau-Ginsburg model whose superpotential is determined by the fivebrane source configuration. Singular limits of the 1/2-BPS configuration space result...
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Ben Craps, Douglas Stanford, Emil Martinec, Iosif Bena09/06/2020 17:45
Moderator: Costas Bachas
Recorded Version: https://youtu.be/MI5-c5-HLC0?t=11684
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Marika Taylor10/06/2020 12:00
At the request of this morning’s speaker, and out of respect for our colleagues who are striking today to protest racial discrimination and institutional violence, we have cancelled this morning's session of the conference.
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Stefano Giusto10/06/2020 14:30
Focusing on the paradigmatic example of the Strominger-Vafa black hole, I will review the insights on the gravitational description of black hole microstates coming from the dual 2D CFT. In particular I will discuss the correlators of "light" probe operators in the "heavy" states representing the microstates and their various limits.
Recorded Version: https://www.youtube.com/watch?v=31f_2G5DLaw
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Jan de Boer10/06/2020 16:00
Recorded Version: https://youtu.be/31f_2G5DLaw?t=5673
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Iosif Bena, Jan de Boer, Juan Maldacena, Samir Mathur, Suvrat Raju10/06/2020 17:45
Moderator: David Turton
Recorded Version: https://youtu.be/31f_2G5DLaw?t=11367
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Phil Saad11/06/2020 12:00
Recorded Version: http://www.youtube.com/watch?v=zB99h7iWKOg
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Ahmed Almheiri11/06/2020 14:30
This talk will be about some surprising results from the semi-classical description of black holes. I will describe how this regime captures both the Hayden-Preskill protocol as well as the Page curve of evaporating black holes, indicative of unitary evaporation. The main tool will be the Island formula, as extension of the holographic entropy prescription to computing the entropy of the...
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Juan Maldacena11/06/2020 16:00
We discuss a two dimensional cosmological model consisting of two dimensional de-Sitter JT gravity plus a CFT . We compute entropies of subregions of the future asymptotic region.
Recorded version: https://youtu.be/wzVMDrfaRXA?t=5406
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Ahmed Almheiri, Juan Maldacena, Samir Mathur, Steve Shenker11/06/2020 17:45
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Stefan Vandoren12/06/2020 12:00
We consider 5D supersymmetric black holes in string theory compactifications that partially break supersymmetry. We compactify type IIB on T^4 and then further compactify on a circle with a duality twist to give Minkowski vacua preserving partial supersymmetry (N=6,4,2,0) in five dimensions. The effective supergravity theory is given by a Scherk-Schwarz reduction with a Scherk-Schwarz...
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Suvrat Raju12/06/2020 14:30
We will describe recent work on how quantum information is stored in quantum gravity in asymptotically flat space. We will argue that all information that is available on future null infinity can also be obtained from a small region near its past boundary. This can be physically understood as the statement that information about the black hole microstate is always available outside the black...
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Erik Verlinde12/06/2020 16:00
We study a simple model of black hole evaporation by considering a 1D QM system coupled to a 2D CFT on a strip, where both the 1D QM system and 2D CFT are chosen to have gravitational dual descriptions in terms of black holes in two and three dimensions respectively. By making use of the fact that JT gravity can be obtained via dimensional reduction of 3D gravity, the full system may be...
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