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.  

practical:

• 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:

•  on Tuesday, Nov 23rd, at 10 a.m. (note unusual date & time!) in Amphi Bloch, Nicolas Kovensky will present "Asymptotically Free AdS3/CFT2" by Balthasar, Giveon, Kutasov and Martinec, https://arxiv.org/abs/2109.00065 and "AdS3's with and without BTZ's" by Martinec https://arxiv.org/abs/2109.11716
  
  
• on Friday, April 8th, at 10:00 a.m. in salle Itzykson, Ioannis Tsiares will present "Transcending the ensemble: baby universes, spacetime wormholes, and the order and disorder of black hole information" by Marolf and Maxfield  https://arxiv.org/abs/2002.08950.
  
  Additional background reading: "Black holes as red herrings: Topological fluctuations and the loss of quantum coherence"  by Coleman and "Baby universe, third quantization and the cosmological constant" by Giddings and Strominger
  
  
• on Friday, April 15th, at 10:00 a.m. in salle Itzykson, Ioannis Tsiares will continue his presentation of "Transcending the ensemble: baby universes, spacetime wormholes, and the order and disorder of black hole information" by Marolf and Maxfield  https://arxiv.org/abs/2002.08950.
  
  
• on Friday, April 22nd, at 10:00 a.m., in salle Itzykson, Eric Perlmutter will present "Semiclassical 3D gravity as an average of large-c CFTs" by Chandra,Collier, Hartman and Maloney  https://arxiv.org/abs/2203.06511 
  
   
   
   
   
   
   
   
  
  
  

• 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  

• The following JC will be rescheduled next year:  "Stringy ER=EPR" by Jafferis and Schneider, https://arxiv.org/abs/2104.07233
  Background reading: "Eternal black holes in AdS" by J. Maldacena,  https://arxiv.org/abs/hep-th/0106112  

 
some additional suggested reading (more ideas welcome!): 

 

•  "Chaotic scattering of highly excited strings", by Gross and Rosenhaus, 
  arXiv:2103.15301

   

 

 

 

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

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", https://journals.aps.org/pr/pdf/10.1103/PhysRev.140.B516 , as well as new developments discussed in the recent paper "An S-Matrix for Massless Particles" by Holmfridur Hannesdottir and Matthew Schwartz https://arxiv.org/abs/1911.06821 .
  
  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 https://arxiv.org/abs/1911.00022
   
• on Friday, Feb 14th, at 10 a.m., Eric Mefford will talk about "Entanglement islands in higher dimensions" by Almheiri, Mahajan and Santos, https://arxiv.org/abs/1911.09666 , as well as "The entropy of bulk quantum fields and the entanglement wedge of an evaporating black hole" by Almheiri, Engelhardt, Marolf and Maxfield, https://arxiv.org/abs/1905.08762
  
  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, https://arxiv.org/abs/1911.11977, as well as "Replica Wormholes and the Entropy of Hawking Radiation" by Almheiri, Hartman, Maldacena, Shaghoulian and Tajdini, https://arxiv.org/abs/1911.12333
  Note unsual day!

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 https://arxiv.org/abs/1906.10100
• 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
  
  
  
  https://arxiv.org/abs/1903.06239
  
  
  
  - In the second half, Severin will present the paper by Grimm, Palti, and Valenzuela,
  
  
  
  http://arxiv.org/abs/arXiv:1802.08264
  
  
  
  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.

New academic year for the journal club!

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

• on Thursday, Oct. 10th, Eva Llabres will present "Charged quantum fields in AdS_2" by Dionysios Anninos, Diego Hofman and Jorrit Kruthoff https://arxiv.org/pdf/1906.00924.pdf
  
  Note unusual date and room: Salle de Conférence Jean Lascoux (Aile0)
  
  
• on Friday, Oct. 25th, Laura Donnay and Andrea Puhm will review the latest developments in flat space holography as follows:
  
  - Laura will review asymptotic symmetries and connection to soft theorems (based on https://arxiv.org/abs/0909.2617 https://arxiv.org/abs/1407.3789 https://arxiv.org/abs/1609.00282 https://arxiv.org/abs/1905.09809)
  
  - Andrea will discuss the relation between amplitudes, celestial correlators and OPEs (https://arxiv.org/abs/1903.01676 https://arxiv.org/abs/1906.10149 https://arxiv.org/abs/1910.07424)

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 https://arxiv.org/abs/1906.10100  
  
  "From Scattering Amplitudes to Classical Physics: Universality, Double Copy and Soft Theorems" by Y. F. Bautista, A. Guevara, https://arxiv.org/abs/1903.12419                                                                                                           
• "Bounds on chaos from the eigenstate thermalization hypothesis" by C. Murthy, M. Srednicki, https://arxiv.org/abs/1906.10808
  
  "Typicality and thermality in 2d CFT" by S. Datta, P. Kraus, B. Michel https://arxiv.org/abs/1904.00668
  
  "Lack of thermalization in (1+1)-d QCD at large Nc" by Axel Cortés Cubero, Neil J. Robinson https://arxiv.org/pdf/1908.00270.pdf
                                                                           
• "Conformality Lost" by David B. Kaplan, Jong-Wan Lee, Dam T. Son, Mikhail A. Stephanov   https://arxiv.org/abs/0905.4752 
  
  "Symmetry Breaking in Coupled SYK or Tensor Models" by J. Kim, I. Klebanov, G. Tarnopolsky, W. Zhao https://arxiv.org/abs/1902.02287

• "A Universal Relation Between Corrections to Entropy and Extremality" by Garrett Goon, Riccardo Penco https://arxiv.org/abs/1909.05254 

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.  

practical:

•  directions to the CPHT can be found at https://www.cpht.polytechnique.fr/?q=fr/node/4
•  we will provide free coffee  at the start of the journal club 
•  internet is provided via eduroam 

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:

  Matrix models and 2D string theory  Emil J. Martinec  hep-th/0410136 | PDF

  Minimal string theory Nathan Seiberg, David Shih  hep-th/0409306 | PDF
  Lectures on 2-D gravity and 2-D string theory Paul H. Ginsparg , Gregory W. Moore e-Print: hep-th/9304011 | PDF
  
  
                                                                                                              
• 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 https://arxiv.org/abs/1601.04744. Additional material can be found in https://arxiv.org/abs/1406.7304 by the first author.

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,  https://arxiv.org/pdf/1709.09668.pdf                                                                                                      
  
• 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, https://arxiv.org/pdf/1810.13440.pdf                   
• 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: https://arxiv.org/abs/1810.11442 and make connections to https://arxiv.org/abs/1812.09613 (Francesco Benini, Paolo Milan) and https://arxiv.org/abs/1705.05383 (Seyed Morteza Hosseini, Kiril Hristov, Alberto Zaffaroni).