1619 May 2023
Prague, Czech Republic
This workshop is about the three different signs of the cosmological constant, the three resulting maximally symmetric spacetimes and their correspondence with conformal field theory. We are bringing together experts on these three aspects of holography to discuss and exchange ideas leading towards its broader understanding. The workshop targets a broad audience of senior researchers as well as postdocs and PhD students. We have scheduled four pedagogical review talks, six technical talks, poster session and discussion sessions.
Tuesday 16th May 
Wednesday 17th May 
Thursday 18th May 
Friday 19th May 


8:30  9:25  Registration  
9:25  9:30  Opening  
09:3010:45  Monica Guica  Diego Hofman  AnaMaria Raclariu  Hong Liu 
10:4511:15  Break  
11:1512:15  Alejandro Cabo Bizet  Damián Galante  Adrien Fiorucci  David Kubizňák 
12:1514:15  Lunch  End of workshop  
14:1515:00  Sameer Murthy  Discussion  Discussion  
15:0016:00  Dan Kapec  Andreas Blommaert  Paolo Benincasa  
16:0016:30  Break  
16:3018:00  Dionysios Anninos  GONG SHOW  Discussion  
Beer Time @ Letna 
SPEAKER  INSTITUTE  TOPIC 

Monica Guica  IPhT Saclay 
Irrelevant deformations and holography
Abstract

Diego Hofman  University of Amsterdam 
Review of dS holography
Review of dS holography

David Kubizňák  Charles University 
Closing remarks
Abstract

Hong Liu  MIT 
Emergence of space and time in holography
I will first review the essential aspects of the AdS/CFT duality, with an eye toward possible generalization to flat or de Sitter spacetime. I will then discuss recent progress in understanding emergence of space, time, and causal structure in AdS from the boundary theory.

AnaMaria Raclariu  University of Amsterdam 
Progress in Flat Space Holography
Celestial holography proposes a duality between the
gravitational Smatrix and correlators in a conformal field theory
living on the celestial sphere. I will review some of the key features
of this proposal, highlighting the importance of symmetries and
discuss a few recent applications, including new insights into the
gravitational phase space, scattering in nonperturbative backgrounds,
connections to twistor theory and the flat space limit of AdS/CFT.

SPEAKER  INSTITUTE  TOPIC 

Paolo Benincasa  Max Planck Institute, Munich 
A Combinatorial Perspective on dS holography
The formulation of a holographic description of the physics in asymptotically de Sitter (dS) spacetimes would provide a microscopic theory for it. The isometries of dS have suggested to look for such a formulation in terms of a conformal field theory. However, there are several indications for which the field theory languange we are occostumed to might not be the most adecuate one, especially if we aim to have a holographic formulation which fully captures the quantum effects of dynamical gravity. In this talk, I'll present recent progress in providing a firstprinciple mathematical formulation for observables defined at the future boundary of dS in terms of certain polytopes. The underlying idea is that the usual principles we know or aspect to hold emerge from the mathematical principles on which they are based.

Andreas Blommaert  SISSA 
Path integrals for DSSYK  towards deriving dS holography
I will discuss a formulation of double scaled SYK amplitudes in terms of representation theory of a quantum group, and derive from this two path integral formulations of DSSYK. One of them, the qSchwarzian, should be viewed as the generalization of the Schwarzian description of low energy SYK. I will then present a gravitational path integral which is holographically dual to this qSchwarzian, which I show by going through its first order gaugetheory formulation. This dilaton gravity model dual to DSSYK has regions of both AdS and dS, as anticipated by Susskind and friends. As such this system presents an opportunity to derive dS holography topdown in a UV complete model. Based on work with Thomas Mertens and Shunyu Yao which will appear soon.

Adrien Fiorucci  TU Vienna 
Sourced Carrollian CFTs & Flat Space Holography
Gravity in fourdimensional asymptotically flat spacetime constitutes the archetypal example of a gravitational system with leaky boundary conditions. In this talk, I will argue that the holographic description of such a system re quires the coupling of the dual theory living at null infinity to some external sources encoding the radiation reaching the conformal boundary and respon sible for the nonconservation of the charges. To formalize this coupling, I will introduce a generalized concept of variational symmetries and derive related Ward identities perturbed by the presence of sources. When applied to a con formal Carrollian field theory living at null infinity, these identities reproduce the BMS fluxbalance laws. The source operators are identified with the boundary value of radiative fields in the bulk, in such a way that correlators of source op erators holographically encode massless scattering amplitudes. Moreover, the constraints imposed on these correlators by the sourced Ward identities are actually equivalent to soft theorems. Finally, I will derive the general form of lowpoint correlation functions for conformal Carrollian field theories using sym metry arguments and exhibit a new branch of distributional solutions, which is the relevant one for holographic purposes.

Damián Galante  King's College London 
Holography inside the dS static patch
I will describe recent progress in trying to formulate a holographic theory inside the static patch of dS_2 by appending it to an AdS boundary. In this way, I can cover 2/3 of the workshop. I will describe some salient features of these spacetimes and propose a microscopic dual for them in terms of particular deformations of the SYK model.

Daniel Kapec  Harvard 
The Geometry of the Space of Celestial CFTs
Celestial CFT” is a formalism which attempts to recast quantum gravity in (d+2)dimensional asymptotically flat spacetimes in terms of a ddimensional Euclidean CFT residing at the conformal boundary. I will discuss certain universal aspects of this correspondence. As in antide Sitter space, bulk gravitons produce a boundary stress tensor, and bulk gluons furnish boundary conserved currents. I will also show that continuous spaces of vacua in the bulk map directly onto the conformal manifold of the boundary CFT. This correspondence provides a new perspective on the role of the BMS group in flat space holography, and offers a new interpretation of the antisymmetric doublesoft gluon theorem in terms of the curvature of an infinitedimensional vacuum manifold.

Alejandro Cabo Bizet  University of Salento & INFN Lecce 
Statistical physics at large charges: lessons from AdS/CFT
Using tools from both sides of AdS/CFT, it has recently been shown that large BPS states on the CFT side of the duality can be understood as microscopic components of the large black holes in AdS5xS5 and AdS4xS7 carrying the same global charges. In this talk, I will review some of the developments that lead to these results, with an emphasis on universal lessons that may help in understanding or uncovering new features of AdS/CFT or other physical systems of interest.

CONVENER  INSTITUTE  TOPIC 

Sameer Murthy  King's College London 
Recent developments in exact AdS/CFT: what do we learn?
in the last few years, we have learned how to incorporate perturbative 1/N corrections and nonperturbative exp(N) effects in the context of various supersymmetric indices in AdS/CFT. I will briefly recapitulate this progress and attempt to elicit a discussion about its importance and where we go from here.

Dionysios Anninos  King's College London 
All Lambda discussion
Abstract

NAME  INSTITUTE 

Dionysios Anninos  King’s College London 
Cynthia Arias  Charles University 
Jose Barrientos  Institute of Mathematics, CAS 
Paolo Benincasa  MaxPlanckInstitut für Physik 
Andreas Blommaert  SISSA 
Alejandro Cabo Bizet  University of Salento & INFN Lecce 
Adolfo Cisterna  Institute of Mathematics of the Czech Academy of Sciences 
Felipe Diaz  Univesidad Andres Bello 
Adrien Fiorucci  Technische Universität Wien 
Damian Galante  King's College London 
Dražen Glavan  CEICO, FZU 
Monica Guica  IPhT, CEA/Saclay 
Diego Hofman  University of Amstertdam 
Sk Jahanur Hoque  Institute of Theoretical Physics, Faculty of Mathematics and Physics, Charles University 
Daniel Kapec  Harvard University 
Jani Kastikainen  APC, Université Paris Cité 
David Kubiznak  Charles University 
Hong Liu  MIT 
Anna Morozova  FZU 
Ruggero Noris  CEICO, Institute of Physics of the Czech Academy of Sciences 
Valentin NOURRY  APC, Université Paris Cité 
Simon Pekar  University of Mons 
Tomáš Procházka  Institute of Physics of the Czech Academy of Sciences 
Ana Raclariu  University of Amsterdam 
Joris Raeymaekers  Ceico, Prague 
Paolo Rossi  CEICO  Charles University 
Canberk Sanli  CEICO 
Ashish Shukla  Ecole Polytechnique 
Constantinos Skordis  CEiCO  FZU, Institute of Physics of the Czech Academy of Sciences 
Georg Stettinger  Prague Academy of Science 
Gizem Şengör  Boğaziçi University 
Tayebeh Tahamtan  ITP, Charles University 
Georg Trenkler  CEICO 
Jaroslav Trnka  UC Davis & Charles University 
Samuel Valach  Trinity College Dublin 
Petr Vasko  Charles University 
David Vegh  Queen Mary University of London 
Matthieu Vilatte  Ecole Polytechnique de Paris 
Gideon Vos  CEICO 
NAME  INSTITUTE 

Mohamed Abdulazeem  Sohag University 
Mir Afrasiar  IIT Kanpur 
Evangelos Afxonidis  University of Oviedo 
Shabeeb Alalawi  kfupm 
Gabriel ArenasHenriquez  Durham University 
Sourish Banerjee Banerjee  BITS Pilani K K Birla Goa Campus 
Debarshi Basu  Indian Institute of Technology Kanpur 
Klaus Bering  Masaryk U 
Somdatta Bhattacharya  unaffiliated 
Swastik Bhattacharya  BITSPilani Hyderabad Campus 
James Bonifacio  University of Mississippi 
Manizheh Botshekananfard  Boğaziçi University 
Bruno Bucciotti  Scuola Normale Superiore, Pisa 
Ayan Chatterjee  Central University of Himachal Pradesh 
Mario Cretì  Unisalento 
Arnaud Delfante  University of Mons 
Ceren A Deral  Bogazici University 
Sarthak Duary  International Centre for Theoretical Sciences, Bangalore 
Wanxiang Fan  University of Southampton 
Silvia Georgescu  IPhT Saclay and CPHT, Ecole polytechnique 
Jewel Ghosh  Independent University, Bangladesh (IUB) 
Nishant Gupta  Institute of Mathematical Sciences, Chennai 
Jan Hladík  Institute of Physics in Opava, Silesian University in Opava 
Krishna Jalan  IMSc, Chennai, India 
Alexandros Kanargias  University of Mainz, Germany 
Maria Knysh  Vrije Universiteit Brussel 
SHIVAM KUSHWAH  IIT ROORKEE 
Emine Şeyma Kutluk  İstanbul Technical University 
Pan Li  Institute of High Energy Physics of Chinese Academy of Sciences 
stefano lionetti  Unisalento 
Daniel Logares  Oviedo University 
Kevin Loo  Tsinghua University 
Dario Melle  Unisalento 
Delaram Mirfendereski  University of Rio Grande Valley 
Sukrut Mondkar  Indian Institute of Technology Madras 
Sameer Murthy  King's College London 
Pratik Nandy  YITP, Kyoto 
Mrityunjay Nath  IIT Indore 
Vijay Nenmeli  University of Cambridge 
Sergei Ovchinnikov  University of Edinburgh 
Kuntal Pal  Indian Institute of Technology Kanpur 
Kunal Pal  Indian Institute of Technology Kanpur 
Himanshu Parihar  National Center for Theoretical Sciences, National Tsing Hua University, Taiwan 
Praneet Pathak  IISER Mohali, India 
Sivasish Paul  RKMVERI, Belur 
Mak Pavičević  SISSA 
Andrea Puhm  CNRS and CPHT, Ecole Polytechnique 
Vinayak Raj  Indian Institute of Technology Kanpur 
PABITRA RAY  International Centre for Theoretical Sciences 
Lorenzo Rossi  Queen Mary University of London 
Romain Ruzziconi  TU Vienna 
Debajyoti Sarkar  IIT Indore 
Ignacy Sawicki  CEICO, Prague 
Sergio Ernesto Aguilar Gutierrez Sergio Ernesto Aguilar Gutierrez  KU Leuven 
Sanjit Shashi  University of Texas, Austin 
Rajeev Singh  Stony Brook University 
Akash Singh  IISER Mohali (India) 
Ryo Suzuki  ShingTung Yau Center of Southeast University 
Abinash Swain  Pune University, India 
poula tadros  Aalto university 
Riccardo Tommasi  Università del Salento 
Martin Vincze  Public 
Rikard von Unge  Masaryk University 
Gopal Yadav  Indian Institute of Technology Roorkee 
Chen Yang  Scuola Normale Superiore 
Utku Zorba  Boğaziçi University 