Indisponibilité programmée / Scheduled outage
https://indico.in2p3.fr/news/5-courte-indisponibilite

BLACK-HOLE MICROSTRUCTURE

Europe/Paris
Via Zoom

Via Zoom

Friday Zoom link : https://zoom.us/j/98783299477
Description

Recorded Youtube links for all the talks can be found in the timetable

 

Conference:  June 8 - 12              


The microscopic description of black holes has been a challenge for more that forty years.  There are now quite a number of promising approaches to solving this problem and the primary goal of this conference and workshop is to bring together experts in these areas to identify synergies, engage in constructive criticism and resolve apparent conflicts.  A significant focus will be the dynamics of black-hole microstructure: how infalling matter is scrambled and how information is recovered.

The conference will involve three talks a day and a panel discussion on the first four days of the conference.   All events will be held via Zoom.


Organizers: Iosif Bena, Nick Warner

Logo IPhTLogo CEA/DSM  Logo CNRS

           

Registration
Registration for Conference - June 8 - 12
Participants
  • Aaron Poole
  • Abhishek Chowdhury
  • Adam Chalabi
  • Adam Levine
  • Adolfo Holguin
  • Ahmed Almheiri
  • Ahmed Rizwan C. L
  • Aidan Chatwin-Davies
  • Akhil Sivakumar
  • Albin James
  • Alessandra Gnecchi
  • Alexander Sevrin
  • Alexander Tyukov
  • Alexandre Belin
  • Alexey Milekhin
  • Alfredo Grillo
  • Ali Mollabashi
  • ali naseh
  • Ali Seraj
  • Alice Bernamonti
  • Allic Sivaramakrishnan
  • Alok Laddha
  • Amir-Kian Kashani-Poor
  • Amitabh Virmani
  • Ana Alonso Serrano
  • Ander Retolaza
  • Andrea Puhm
  • Andrei Parnachev
  • Anna Ceresole
  • Anthony Charles
  • Anthony Houppe
  • Antoine Van Proeyen
  • Antonia Frassino
  • Anuj Apte
  • Aranya Bhattacharya
  • Arghya Chattopadhyay
  • Arnab Kundu
  • Arnab Priya Saha
  • Arpit Das
  • Arpita Mitra
  • Arvin Shahbazi-Moghaddam
  • Ashoke Sen
  • Aswin P M
  • Atreya Chatterjee
  • Bahman Najian
  • Bala Sathiapalan
  • Batoul Banihashemi
  • Beatrix Muehlmann
  • Behrad Taghavi
  • Ben Craps
  • Bernard Julia
  • Bert Vercnocke
  • Bianca Letizia Cerchiai
  • BIDISHA CHAKRABARTY
  • Bilyana Tomova
  • Bin Guo
  • Bindusar Sahoo
  • Bobby Ezhuthachan
  • Bogdan Ganchev
  • Bogdan Ganchev
  • Boris Pioline
  • Boris Post
  • Carlos Nunez
  • Cesar Alfonso Agon
  • Chandan Jana
  • Chandrasekhar Bhamidipati
  • Charles Rabideau
  • Charlie Woodward
  • Chethan Krishnan
  • Chris Blair
  • Christopher Hull
  • Constantin Bachas
  • Damian Galante
  • Daniel Mayerson
  • Dario Consoli
  • David Berman
  • David JIn
  • David Kutasov
  • David Turton
  • David Vegh
  • Davide Billo
  • Davide Bufalini
  • Davide Cassani
  • Davide Maria Lombardo
  • Debaiudh Das
  • Debangshu Mukherjee
  • Debodirna Ghosh
  • Dieter Van den Bleeken
  • Dileep Jatkar
  • Dominik Neuenfeld
  • Dongsheng Ge
  • Edward Witten
  • Elena Caceres
  • Elias Kiritsis
  • Emil Martinec
  • Emilian Dudas
  • Enrico Parisini
  • Eric David Kramer
  • Erin Crawley
  • Eva Llabres Llambias
  • Evita Verheijden
  • Farzad Omidi
  • Federico Capone
  • Federico Galli
  • Felix Haehl
  • Francesco Benini
  • Frank Ferrari
  • François David
  • Frederik Denef
  • Gabriel Arenas-Henriquez
  • Gabriel Larios
  • Gautam Mandal
  • George Musser
  • Gianluca Inverso
  • Gonçalo Araujo Regado
  • Grégoire Josse
  • Guillaume Beaujard
  • guillaume bossard
  • Hadi Godazgar
  • Hamid Afshar
  • Harvendra Singh
  • Helvi Witek
  • Henry Lin
  • Himanshu Khanchandani
  • Ho Tat Lam
  • Huibert het Lam
  • Ibrahima Bah
  • Indranil Chakraborty
  • Ioanna Kourkoulou
  • Iosif Bena
  • Iosif Bena
  • Iva Lovrekovic
  • jacek pawelczyk
  • Jaffino Stargen
  • Jan de Boer
  • Jan Troost
  • Jaydeep Kumar Basak
  • Jeremy van der Heijden
  • Jesse van Muiden
  • Jewel Kumar Ghosh
  • Jiabao Yang
  • Joel Perlskog
  • Joris Raeymaekers
  • Jorrit Kruthoff
  • Jose Francisco Morales
  • Jose J. Fernandez-Melgarejo
  • João Cavalcante
  • Juan F. Pedraza
  • Julio Arrechea
  • K P Yogendran
  • Kajal Singh
  • Karan Fernandes
  • Kartheek Hegde
  • Kevin Nguyen
  • Klaas Parmentier
  • Kostas Skenderis
  • Kuo-Wei Huang
  • Kwinten Fransen
  • Laura Donnay
  • Lin-Qing Chen
  • Linus Too
  • Lorenzo Küchler
  • Lorenzo Pieri
  • Lucas Kang
  • Luigi Martina
  • Mahdi Godazgar
  • Malcolm Perry
  • Marc-Antoine Fiset
  • Marcel Hughes
  • Marco Sanchioni
  • Mariana Grana
  • Marija Tomasevic
  • Marika Taylor
  • Marine De Clerck
  • Mark Mezei
  • Martin Enriquez Rojo
  • Martí Rosselló
  • Masaki Shigemori
  • Massimo Bianchi
  • Matteo Cardella
  • Matthew Russell
  • Mattia Cesàro
  • Md Abhishek
  • Micha Berkooz
  • Michael Good
  • Miles Miller-Dickson
  • minasian ruben
  • Mohammad Reza Mohammadi Mozaffar
  • Mohsen Alishahiha
  • Monica Guica
  • Mritunjay Verma
  • Myungbo Shim
  • Narayan K
  • Natalia Pinzani Fokeeva
  • Nava Gaddam
  • Naveena Kumara A
  • Nehal Mittal
  • Nejc Ceplak
  • Nicholas Klein
  • Nicholas Warner
  • Nicolas Delporte
  • Nikolay Bobev
  • Nizar Ezroura
  • Olga Papadoulaki
  • Ondřej Hulík
  • Onkar Parrikar
  • Orestis Vasilakis
  • Oscar Barron
  • Pablo Bueno
  • Pablo Cano
  • Panagiotis Betzios
  • Pedro Aniceto
  • Pedro F Ramirez
  • Phil Saad
  • Phil Saad
  • Philip Hacker
  • Pierre Heidmann
  • Pinaki Banerjee
  • Pouya Golmohammadi
  • Prahar Mitra
  • Pranjal Nayak
  • Prasanta Tripathy
  • Pratik Rath
  • PRIYADARSHINI PANDIT
  • Pushkal Shrivastava
  • Raghu Mahajan
  • Rajeev Singh
  • Raphael Bousso
  • Reggie Caginalp
  • Renata Ferrero
  • Ricardo Espindola
  • Rifath Khan
  • Robert Walker
  • Roberto Emparan
  • Rodolfo Russo
  • Romain Ruzziconi
  • Ronak Soni
  • Ruben Minasian
  • Ruben Monten
  • Sabrina Pasterski
  • Sabyasachi Maulik
  • Sachin Grover
  • Sagar F. Lokhande
  • Saman Soltani
  • Sami Rawash
  • Samir Mathur
  • Sanjit Shashi
  • Sara Bonansea
  • Severin Lüst
  • Shankhadeep Chakrabortty
  • Shaun Hampton
  • Shiraz Minwalla
  • Shiroman Prakash
  • Shubho Roy
  • Shunyu Yao
  • Siddharth Prabhu
  • Simon Pekar
  • Simon Ross
  • Souvik Banerjee
  • Sovan Sau
  • Spenta Wadia
  • Stam Nicolis
  • Stavros Mougiakakos
  • Stefan Eccles
  • Stefan Vandoren
  • Stefano Antonini
  • Stefano Giusto
  • Stefano Massai
  • Stephen Shenker
  • Stéphane Detournay
  • Subramanya Hegde
  • Sujay Ashok
  • Sunit Patil
  • Surbhi Khetrapal
  • Suvendu Giri
  • Suvrat Raju
  • Swapnamay Mondal
  • Taha Malik
  • Taniya Mandal
  • Ulf Danielsson
  • Valentin Reys
  • Vasil Dimitrov
  • Ven Chandrasekaran
  • Vinay Malvimat
  • Vladimir Kazakov
  • Xinping Yang
  • Yi Pang
  • Yiming Chen
  • Yixuan LI
  • Yun-Long Zhang
  • Zackary White
    • 11:50 12:00
      Connecting. Welcome 10m

      All events are given in Paris time

      Zoom Meeting ID: 989 6887 0177

    • 12:00 13:00
      Gravitational wave echoes, microstates and AdS/CFT 1h

      Recorded version: http://www.youtube.com/watch?v=bSJS8yWdnrA

      Speaker: Bert Vercnocke
    • 14:30 15:30
      Making Microstate Geometries Spark Joy: Decluttering using Holomorphy and Dimensional Reduction 1h

      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. Second, some of these superstrata can be dimensionally reduced on a three-sphere to three dimensions, 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

      Speaker: Daniel Mayerson
    • 16:00 17:00
      The VECRO hypothesis 1h

      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: https://youtu.be/Li7N8NUpAAw?t=5409

      Speaker: Samir Mathur
    • 17:45 19:00
      Panel: What does BMS and soft hair tell us about microstate structure? 1h 15m

      Moderator: Guillaume Bossard

      Recorded discussion: https://www.youtube.com/watch?v=NtQJsSiv4Fw

      Speakers: Andrea Puhm, Geoffrey Compère, Malcolm Perry
    • 11:50 12:00
      Connecting: Zoom address 10m

      All events are given in Paris time

      Zoom Meeting ID 957 9920 8880

    • 12:00 13:00
      Chaos at the rim of black hole and fuzzball shadows 1h

      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 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

      Speaker: Jose Morales
    • 14:30 15:30
      The Great Escape: Tunneling out of Microstate Geometries 1h

      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 comparable with the behavior of ultracompact stars, as one should expect for microstate geometries.

      Recorded Version: https://www.youtube.com/watch?v=MI5-c5-HLC0

      Speaker: Pierre Heidmann
    • 16:00 17:00
      Stringy Structure at the BPS Bound 1h

      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 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 gravitational bulk description the central actors in the non-gravitational dual theory underlying black hole thermodynamics.

      Recorded Version: https://youtu.be/MI5-c5-HLC0?t=5330

      Speaker: Emil Martinec
    • 17:45 19:00
      Panel: Microstates and Chaos 1h 15m

      Moderator: Costas Bachas

      Recorded Version: https://youtu.be/MI5-c5-HLC0?t=11684

      Speakers: Ben Craps, Douglas Stanford, Emil Martinec, Iosif Bena
    • 11:50 12:00
      Connecting: Zoom address 10m

      All events are given in Paris time

      Zoom Meeting ID 996 8098 6502

    • 12:00 13:00
      Session Cancelled 1h

      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.

      Speaker: Marika Taylor
    • 14:30 15:30
      What AdS_3 holography can tell us about black hole microstates? 1h

      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

      Speaker: Stefano Giusto
    • 16:00 17:00
      Gravity and randomness 1h

      Recorded Version: https://youtu.be/31f_2G5DLaw?t=5673

      Speaker: Jan de Boer
    • 17:45 19:00
      Panel: Do typical states have horizons? 1h 15m

      Moderator: David Turton

      Recorded Version: https://youtu.be/31f_2G5DLaw?t=11367

      Speakers: Iosif Bena, Jan de Boer, Juan Maldacena, Samir Mathur, Suvrat Raju
    • 11:50 12:00
      Connecting: Zoom address 10m

      All events are given in Paris time

      Zoom Meeting ID 988 2505 2011

    • 12:00 13:00
      Some comments on wormholes and factorization 1h

      Recorded Version: http://www.youtube.com/watch?v=zB99h7iWKOg

      Speaker: Phil Saad
    • 14:30 15:30
      The unreasonable effectiveness of semi-classical gravity without microstructure. 1h

      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.

      Recorded version: https://youtu.be/wzVMDrfaRXA

      Speaker: Ahmed Almheiri
    • 16:00 17:00
      Entropies of subregions in two dimensional cosmological models 1h

      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

      Speaker: Juan Maldacena
    • 17:45 19:00
      Panel: Islands, JT Gravity, AdS2 holography and Microstate Structure. 1h 15m

      Moderator: Marika Taylor

      Recorded version: https://youtu.be/Vr61WnB6Ndw

      Speakers: Ahmed Almheiri, Juan Maldacena, Samir Mathur, Steve Shenker
    • 11:50 12:00
      Connecting: Zoom address 10m

      All events are given in Paris time

      Zoom Meeting ID 987 8329 9477

    • 12:00 13:00
      Black Holes in string theory with duality twists. 1h

      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 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.

      Recorded version https://youtu.be/BMzNHx2wSWo

      Speaker: Stefan Vandoren
    • 14:30 15:30
      Is structure at the horizon required to resolve the information paradox? 1h

      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 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.

      Recorded version https://youtu.be/7rvMkqVBhbY

      Speaker: Suvrat Raju
    • 16:00 17:00
      JT, BTZ and the Island Phenomenon. 1h

      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.

      Recorded version https://youtu.be/7rvMkqVBhbY?t=5773

      Speaker: Erik Verlinde