Rapport sur les contributions - BLACK-HOLE MICROSTRUCTURE
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BLACK-HOLE MICROSTRUCTURE Rapport sur les contributions https://indico.in2p3.fr/e/Microstructure
BLACK-HOLE M … / Rapport sur les contributions Gravitational wave echoes, micros …
Contribution ID: 1 Type: not specified
Gravitational wave echoes, microstates and AdS/CFT
lundi 8 juin 2020 12:00 (1 heure)
Recorded version: http://www.youtube.com/watch?v=bSJS8yWdnrA
Orateur: VERCNOCKE, Bert
June 10, 2020 Page 1BLACK-HOLE M … / Rapport sur les contributions Making Microstate Geometries Sp …
Contribution ID: 2 Type: not specified
Making Microstate Geometries Spark Joy:
Decluttering using Holomorphy and Dimensional
Reduction
lundi 8 juin 2020 14:30 (1 heure)
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 simplify-
ing 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.
Second, some of these superstrata can be dimensionally reduced on a three-sphere to three dimen-
sions, where they take on a much simpler form. I will also discuss why this should “spark joy”, as
these new tools and insights are a first steps on a path towards constructing and understanding
more general three-charge microstates.
Recorded version: http://www.youtube.com/watch?v=Li7N8NUpAAw
Orateur: MAYERSON, Daniel
June 10, 2020 Page 2BLACK-HOLE M … / Rapport sur les contributions The VECRO hypothesis
Contribution ID: 3 Type: not specified
The VECRO hypothesis
lundi 8 juin 2020 16:00 (1 heure)
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
can be resolved by the following hypothesis: The vacuum wavefunctional of quantum gravity
contains a “vecro” component made of virtual fluctuations of configurations of the same type that
arise in the fuzzball structure of black hole microstates. Further, if we assume that causality holds to
leading order in gently curved spacetime, then we must necessarily have such a vecro component
in order to resolve the above conflicts. The term vecro stands for ‘Virtual Extended Compression-
Resistant Objects’, and characterizes the nature of the vacuum fluctuations that resolve the puzzles.
It is interesting that puzzle (c) may relate the role of quantum gravity in black holes to observations
in the sky.
Recorded version: http://www.youtube.com/watch?v=Li7N8NUpAAw
Orateur: MATHUR, Samir
June 10, 2020 Page 3BLACK-HOLE M … / Rapport sur les contributions Panel: What does BMS and soft ha …
Contribution ID: 4 Type: not specified
Panel: What does BMS and soft hair tell us about
microstate structure?
lundi 8 juin 2020 17:45 (1h 15m)
Moderator: Guillaume Bossard
Recorded discussion: https://www.youtube.com/watch?v=NtQJsSiv4Fw
Auteurs principaux: PUHM, Andrea; COMPÈRE, Geoffrey; PERRY, Malcolm
Orateurs: PUHM, Andrea; COMPÈRE, Geoffrey; PERRY, Malcolm
June 10, 2020 Page 4BLACK-HOLE M … / Rapport sur les contributions Chaos at the rim of black hole and …
Contribution ID: 5 Type: not specified
Chaos at the rim of black hole and fuzzball shadows
mardi 9 juin 2020 12:00 (1 heure)
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 com-
pute the Lyapunov exponent \lambda governing the exponential growth. We find that fuzzballs
and JMART geometries are characterised by Lyapunov exponents smaller than those associated
to Black holes with the same mass providing evidence for the existence of a universal bound on
chaos.
Recorded version: http://www.youtube.com/watch?v=jAtq0gO9DSE
Orateur: MORALES, Jose
June 10, 2020 Page 5BLACK-HOLE M … / Rapport sur les contributions The Great Escape: Tunneling out o …
Contribution ID: 6 Type: not specified
The Great Escape: Tunneling out of Microstate
Geometries
mardi 9 juin 2020 14:30 (1 heure)
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 these capped geometries generate large redshifts, which lead to exceptionally-
low-energy states with extremely long decay times, set by the central charge of the dual CFT to
the power of twice the dimension of the operator dual to the mode. While these decay times are
extremely long, we also argue that the energy decay is bounded, at large t, by log(t)^-2 and is com-
parable with the behavior of ultracompact stars, as one should expect for microstate geometries.
Recorded Version: https://www.youtube.com/watch?v=MI5-c5-HLC0
Orateur: HEIDMANN, Pierre
June 10, 2020 Page 6BLACK-HOLE M … / Rapport sur les contributions Stringy Structure at the BPS Bound
Contribution ID: 7 Type: not specified
Stringy Structure at the BPS Bound
mardi 9 juin 2020 16:00 (1 heure)
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 de-
termined by the fivebrane source configuration. Singular limits of the 1/2-BPS configuration space
result when the fivebrane worldvolume self-intersects, as can be seen from both sides of the duality
– on the Landau-Ginsburg side from the degeneration of the superpotential, and on the geometrical
side from an analysis of D-brane probes. These singular limits are a portal to black hole formation
via the condensation of the W-branes that are becoming massless, and thus exhibit in the gravi-
tational bulk description the central actors in the non-gravitational dual theory underlying black
hole thermodynamics.
Recorded Version: https://www.youtube.com/watch?v=MI5-c5-HLC0
Orateur: MARTINEC, Emil
June 10, 2020 Page 7BLACK-HOLE M … / Rapport sur les contributions Panel: Microstates and Chaos
Contribution ID: 8 Type: not specified
Panel: Microstates and Chaos
mardi 9 juin 2020 17:45 (1h 15m)
Moderator: Costas Bachas
Recorded Version: https://www.youtube.com/watch?v=MI5-c5-HLC0
Orateurs: CRAPS, Ben; STANFORD, Douglas; MARTINEC, Emil; BENA, Iosif
June 10, 2020 Page 8BLACK-HOLE M … / Rapport sur les contributions Session Cancelled
Contribution ID: 9 Type: not specified
Session Cancelled
mercredi 10 juin 2020 12:00 (1 heure)
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.
Orateur: TAYLOR, Marika
June 10, 2020 Page 9BLACK-HOLE M … / Rapport sur les contributions What AdS_3 holography can tell u …
Contribution ID: 10 Type: not specified
What AdS_3 holography can tell us about black hole
microstates?
mercredi 10 juin 2020 14:30 (1 heure)
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 partic-
ular 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
Orateur: GIUSTO, Stefano
June 10, 2020 Page 10BLACK-HOLE M … / Rapport sur les contributions Gravity and randomness
Contribution ID: 11 Type: not specified
Gravity and randomness
mercredi 10 juin 2020 16:00 (1 heure)
Recorded Version: https://www.youtube.com/watch?v=31f_2G5DLaw
Orateur: DE BOER, Jan
June 10, 2020 Page 11BLACK-HOLE M … / Rapport sur les contributions Panel: Do typical states have horiz …
Contribution ID: 12 Type: not specified
Panel: Do typical states have horizons?
mercredi 10 juin 2020 17:45 (1h 15m)
Moderator: David Turton
Recorded Version: https://www.youtube.com/watch?v=31f_2G5DLaw
Orateurs: BENA, Iosif; DE BOER, Jan; MALDACENA, Juan; MATHUR, Samir; RAJU, Suvrat
June 10, 2020 Page 12BLACK-HOLE M … / Rapport sur les contributions Entropies of subregions in two dim …
Contribution ID: 13 Type: not specified
Entropies of subregions in two dimensional
cosmological models
jeudi 11 juin 2020 16:00 (1 heure)
We discuss a two dimensional cosmological model consisting of two dimensional de-Sitter JT grav-
ity plus a CFT . We compute entropies of subregions of the future asymptotic region.
Orateur: MALDACENA, Juan
June 10, 2020 Page 13BLACK-HOLE M … / Rapport sur les contributions The unreasonable effectiveness of …
Contribution ID: 14 Type: not specified
The unreasonable effectiveness of semi-classical
gravity without microstructure.
jeudi 11 juin 2020 14:30 (1 heure)
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 Hawking radiation. I will briefly mention how this formula is derived from a nonperturbative
contributions to the replica trick.
Orateur: ALMHEIRI, Ahmed
June 10, 2020 Page 14BLACK-HOLE M … / Rapport sur les contributions Some comments on wormholes an …
Contribution ID: 15 Type: not specified
Some comments on wormholes and factorization
jeudi 11 juin 2020 12:00 (1 heure)
Orateur: SAAD, Phil
June 10, 2020 Page 15BLACK-HOLE M … / Rapport sur les contributions Panel: Islands, JT Gravity, AdS2 h …
Contribution ID: 16 Type: not specified
Panel: Islands, JT Gravity, AdS2 holography and
Microstate Structure.
jeudi 11 juin 2020 17:45 (1h 15m)
Moderator: Marika Taylor
Orateurs: ALMHEIRI, Ahmed; MALDACENA, Juan; MATHUR, Samir; SHENKER, Steve
June 10, 2020 Page 16BLACK-HOLE M … / Rapport sur les contributions Black Holes in string theory with …
Contribution ID: 17 Type: not specified
Black Holes in string theory with duality twists.
vendredi 12 juin 2020 12:00 (1 heure)
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 dimen-
sions. The effective supergravity theory is given by a Scherk-Schwarz reduction with a Scherk-
Schwarz supergravity potential on the moduli space, and the lift of this to string theory imposes
a quantization condition on the mass parameters. In this theory, we study black holes with three
charges that descend from various ten-dimensional brane configurations. For each black hole we
choose the duality twist to be a transformation that preserves the solution, so that it remains a
supersymmetric solution of the twisted theory with partially broken supersymmetry. We discuss
the quantum corrections arising from the twist to the pure gauge and mixed gauge-gravitational
Chern-Simons terms in the action and the resulting corrections to the black hole entropy.
Orateur: VANDOREN, Stefan
June 10, 2020 Page 17BLACK-HOLE M … / Rapport sur les contributions Is structure at the horizon required …
Contribution ID: 18 Type: not specified
Is structure at the horizon required to resolve the
information paradox?
vendredi 12 juin 2020 14:30 (1 heure)
We will describe recent work on how quantum information is stored in quantum gravity in asymp-
totically 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 hole. We also show how one can sidestep the “small corrections theorem”, and resolve the
“bags of gold paradox”. In particular, this means that the information paradox, by itself, cannot
provide a reason for expecting “structure” near the black-hole horizon.
Orateur: RAJU, Suvrat
June 10, 2020 Page 18BLACK-HOLE M … / Rapport sur les contributions JT, BTZ and the Island Phenomenon.
Contribution ID: 19 Type: not specified
JT, BTZ and the Island Phenomenon.
vendredi 12 juin 2020 16:00 (1 heure)
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 represented as a single BTZ geometry., in which the boundary of the strip is mapped on
to end-of the world branes that extend to the horizon. This model exhibits and illuminates the
notions of quantum entanglement, quantum extremal surfaces and the Island phenomenon in a
simple and intuitive geometrical fashion.
Orateur: VERLINDE, Erik
June 10, 2020 Page 19You can also read
