jeudi 28 octobre 2021

Welcome to the hybrid Journal Club!

After a long pause due, again, to covid, the journal club "Quantum black holes on the plateau" will restart in a brand new, hybrid mode

where: IPhT, CEA Saclay and on-line

when:  every other Friday at 2:15 p.m.

topics:  recent papers related to the quantum structure of black holes, bulk EFT, Page curves, etc.

how it works:
one person prepares a presentation, and everyone else reads the paper and prepares for a discussion. Papers can either be chosen from the suggested readings on this website, or the speaker can come up with his/her own paper to read, which should fit with the general topic of the journal club.  


  • directions to the IPhT can be found here
  • the room will either be amphi Bloch or salle Itzykson, both on the IPhT  ground floor, depending on covid-related restrictions  
  • wearing a mask is compulsory, except for the speaker
  • internet is provided via eduroam or orme-enregistrement/access
  • outside participants who would like to spend the entire day at the IPhT can contact  Monica for lunch arrangements
  • the videoconferencing link and password for the on-line participants will be sent by e-mail to those registered to the JC mailing list     
  • the JC will not be recorded

The first three journal clubs are:

  • the JC on “Massive Islands” by Geng and Karch, arXiv:2006.02438 and “Inconsistency of Islands in Theories with Long-Range Gravity” by Geng, Karch, Perez-Pardavilla, Raju, Randall, Riojas, Shashi  arXiv:2107.03390  will be rescheduled

    Additional background reading: "The CFT/AdS correspondence, massive gravitons and a connectivity index conjecture” by Aharony, Clark, Karch, hep-th/0608089  and  “The page curve of Hawking radiation from semiclassical geometry” by Almheiri, Mahajan, Maldacena, Zhao, arXiv:1908.10996  

some additional suggested reading (more ideas welcome!): 


  •  "Chaotic scattering of highly excited strings", by Gross and Rosenhaus, 




mercredi 7 octobre 2020

The journal club is back!

The "Quantum black holes on the plateu" Journal club,  temporarily stopped due to Covid-19, will start again at a new time and new location:

where: ENS Paris (Montagne Sainte-Genevieve, so still a hill, if not a plateau)                      

            24 Rue Lhomond, Paris 75005

            salle L361 (24 people), a priori reserved on 19 & 26/10, 09/11, 14 & 21/12

            salle L382/384 (16 people) reserved for  12/10, 02, 16, 23 & 30/11, 07/12

when: the JC will take place on Mondays at 2 p.m. , in principle every other week. 
          The actual dates will be announced progressively on this website.

The first JC of the new series will be given

  • on Monday, Oct 19th, at 2 p.m. in salle L361, Giuseppe Policastro will talk about "Bra-ket wormholes in gravitationally prepared states" by Chen, Gorbenko and Maldacena arXiv:2007.16091

jeudi 9 janvier 2020

First four journal clubs in 2020

  • on Friday, Jan 17th at 10 a.m. sharp Guillaume Bossard will talk about the 1965 paper by S. Weinberg, "Infrared Photons and Gravitons", , as well as new developments discussed in the recent paper "An S-Matrix for Massless Particles" by Holmfridur Hannesdottir and Matthew Schwartz .

    Note unsual time! There will be coffee and mini-croissants starting at 9:45.

  • TO BE RESCHEDULED: Ruben Monten will talk about "λφ^4  in dS" by Gorbenko and Senatore
  • on Friday, Feb 14th, at 10 a.m., Eric Mefford will talk about "Entanglement islands in higher dimensions" by Almheiri, Mahajan and Santos, , as well as "The entropy of bulk quantum fields and the entanglement wedge of an evaporating black hole" by Almheiri, Engelhardt, Marolf and Maxfield,

    Note unsual time! There will be coffee and mini-croissants starting at 9:45.
  • on Monday, March 9th, at 2:15 p.m., Kenta Suzuki will talk about "Replica wormholes and the black hole interior" by Penington, Skenker, Stanford and Yang,, as well as "Replica Wormholes and the Entropy of Hawking Radiation" by Almheiri, Hartman, Maldacena, Shaghoulian and Tajdini,
    Note unsual day!

mardi 26 novembre 2019

Journal clubs until the end of the year

  • on Friday, November 29th at 14h15, Piotr Tourkine will present  "Kerr Black Holes as Elementary Particles" by Nima Arkani-Hamed, Yu-tin Huang, Donal O'Connell
  • on Friday,  November 15th Yixuan Li  and  Severin Lüst will discuss the main swampland conjectures, as follows:

    - In the first part, Yixuan will give a short presentation of the panel of the different swampland conjectures (centering on the Weak Gravity Conjecture and the Distance Conjecture) that have been stated, and some links between them, using sections 2,3,4 of   Eran Palti's review

    - In the second half, Severin will present the paper by Grimm, Palti, and Valenzuela,

    which discusses a string theory test of the infinite distance conjecture. A summary of this paper can also be found in section 4.7.1 of Palti's review.

mardi 1 octobre 2019

New academic year for the journal club!

Dear all, this academic year's journal club will kick off on October 10th, as follows

Other papers that are up for discussion are:

  • "Kerr Black Holes as Elementary Particles" by Nima Arkani-Hamed, Yu-tin Huang and Donal O'Connell  

    "From Scattering Amplitudes to Classical Physics: Universality, Double Copy and Soft Theorems" by Y. F. Bautista, A. Guevara,                                                                                                           
  • "Bounds on chaos from the eigenstate thermalization hypothesis" by C. Murthy, M. Srednicki,

    "Typicality and thermality in 2d CFT" by S. Datta, P. Kraus, B. Michel

    "Lack of thermalization in (1+1)-d QCD at large Nc" by Axel Cortés Cubero, Neil J. Robinson
  • "Conformality Lost" by David B. Kaplan, Jong-Wan Lee, Dam T. Son, Mikhail A. Stephanov 

    "Symmetry Breaking in Coupled SYK or Tensor Models" by J. Kim, I. Klebanov, G. Tarnopolsky, W. Zhao
  • "A Universal Relation Between Corrections to Entropy and Extremality" by Garrett Goon, Riccardo Penco 

You are welcome to propose other papers by clicking the comments button below. Also, since the ideal is to have a discussion about these papers,  it would be great if as many people as possible read the papers ahead of time.

Here is some practical information for this year's newcomers

where : CPHT, Ecole Polytechnique, Salle de Conférence Louis Michel (Bât.6)

when:   every other Friday at 2:15 p.m., starting Oct. 10th

topics:  recent papers on the quantum structure of black holes, bulk effective field theory, bulk reconstruction (via bootstrap/entanglement), asymptotic symmetries (BMS)

how it works: one person prepares a presentation, and everyone else reads the paper and prepares for a discussion. Papers can either be chosen from the suggested readings on this website, or the speaker can suggest a paper to read, which should fit with the general topic of the journal club.  


mardi 26 février 2019

Journal club dates in spring 2019

The dates of the journal club until summer 2019 are:

  • Fri, May 31st volunteer needed!                                                                      
  • on Friday, May 10th , Emil Martinec will explain the core ideas in ``JT gravity as a matrix integral'' by Saad, Shenker and Stanford  arXiv:1903.11115, which attempts a nonperturbative definition of (nearly) AdS2 quantum gravity through matrix model techniques. This work follows on a rich history of attempts to quantize 2d gravity, some of which will be described.  Background material for these aspects of the discussion is older work on the relation between matrix models and Liouville gravity on which much of their discussion is based:

  • on Friday, Apr 19th , Ander Retolaza will present an overview of `` On de Sitter vacua in String theory compactifications’’  based on 1804.01120, 1808.08967 and 1610.01533. Additional material can be found in hep-th/0007018, hep-th/0105097, hep-th/0301240, 0805.1029.                                                                                   
  • on Friday, Mar 22nd, Monica Guica  will present the paper « Local subsystems in gauge theory and gravity" by William Donnelly and Laurent Freidel Additional material can be found in by the first author.

mardi 15 janvier 2019

First four journal clubs in 2019


The first four journal clubs of 2019 will take place on:

  • on Friday, Mar 1st at 2:15 p.m., Eric Mefford will discuss "Probing typical black hole microstates" by de Boer, van Breukelen, Lokhande, Papadodimas, and Verlinde (1901.08527), starting with  an overview of Tomita-Takesaki theory from Witten's lecture notes on entanglement   entropy (1803.04993).        
  • on Friday, Feb 15th at 2:15 p.m., Luca Ciambelli will present "Is there a breakdown of effective field theory at the horizon of an extremal black hole?" by Shahar Hadar and Harvey S. Reall                                                                                                      
  • on Friday, Feb 1st at 2:15 p.m.,Daniel Mayerson will present "Emergent classical spacetime from microstates of an incipient black hole" by Vijay Balasubramanian, David Berenstein, Aitor Lewkowycz, Alexandra Miller, Onkar Parrikar, Charles Rabideau,                   
  • Friday, Jan 18th at 10:15 a.m. (note unusual time!), presented by Chiara Toldo on "Microscopic origin of the Bekenstein-Hawking entropy of supersymmetric AdS5 black holes" by Alejandro Cabo-Bizet, Davide Cassani, Dario Martelli, Sameer Murthy: and make connections to (Francesco Benini, Paolo Milan) and (Seyed Morteza Hosseini, Kiril Hristov, Alberto Zaffaroni).