École Normale Supérieure Summer Institute 2024

Europe/Paris
ENS and Collège de France

ENS and Collège de France

ENS: 24 Rue Lhomond -- room Conf IV 2nd floor CdF: 11, place Marcelin Berthelot 75005 Paris, France
Boris Pioline (LPTHE, Sorbonne Université et CNRS), Bruno Le Floch (CNRS), Elias Kiritsis (UoC and APC), Francesco Nitti (APC, Université de Paris), Giuseppe Policastro (LPTENS), Kallia Petraki (ENS and Sorbonne University), Marc Henneaux (Université Libre de Bruxelles & Collège de France), Miguel Fernandes Paulos (Ecole Normale Superieure), Raffaele DAgnolo
Description

We are looking forward to welcoming you to the 2024 edition of the ENS Summer Institute. The ENS Summer Institute aims to cover a broad spectrum of topics in high-energy physics and cosmology, and provide ample opportunities for discussion. 

This year, it will include topics on quantum gravity, holography and quantum field theory, while the phenomenological session will be devoted to axions. 

Special event: On Wednesday 26/06, we will celebrate the distinguished career and scientific legacy of our esteemed colleague, Costas Bachas, on the occasion of his retirement.

The meeting will be held at two different locations:

  • 20-21 June at Collège de France, as part of the Colloque "Topics in Quantum Gravity"
  • 22-28 June at École Normale Supérieure.
     

Recent past editions: 2023, 2018, 2017

    • 10:30 11:00
      Welcome coffee Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot (College de France)

      Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot

      College de France

      11, place Marcelin Berthelot, 75005 Paris, France
    • 11:00 12:00
      Formal theory Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot (College de France)

      Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot

      College de France

      11, place Marcelin Berthelot, 75005 Paris, France
      • 11:00
        No global symmetries and string universality 1h
        Orateur: Prof. Miguel Montero
    • 14:00 15:00
      Formal theory Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot (College de France)

      Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot

      College de France

      11, place Marcelin Berthelot, 75005 Paris, France
      • 14:00
        Lower-dimensional gravity, DSSYK and group theory 1h

        In this talk, I will report on recent process in understanding lower-dimensional gravitational models structurally from group theory. The main strength of this approach seems to be its universality in describing different models. In particular, I will discuss how it can be used to argue for a bulk holographic dual of double-scaled SYK (DSSYK) in terms of sine dilaton gravity.

        Orateur: Thomas Mertens (University of Ghent, Belgium)
    • 15:00 15:30
      Coffee Break Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot (College de France)

      Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot

      College de France

      11, place Marcelin Berthelot, 75005 Paris, France
    • 15:30 16:30
      Formal theory Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot (College de France)

      Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot

      College de France

      11, place Marcelin Berthelot, 75005 Paris, France
      • 15:30
        The Parisi-Sourlas Uplift and Infinitely Many Solvable 4d CFTs 1h

        Parisi-Sourlas (PS) supersymmetry is known to emerge in some models with random field type of disorder. When PS SUSY is present the d-dimensional theory allows for a d−2-dimensional description. In this paper we investigate the reversed question and we provide new indications that any given CFT_{d−2} can be uplifted to a PS SUSY CFT_d. We show that any scalar four-point function of a CFT_{d−2} is mapped to a set of 43 four-point functions of the uplifted CFTd which are related to each other by SUSY and satisfy all necessary bootstrap axioms. As a byproduct we find 43 non trivial relations between conformal blocks across dimensions.
        We test the uplift in generalized free field theory (GFF) and find that PS SUSY is a powerful tool to bootstrap an infinite class of previously unknown GFF observables. Some of this power is shown to persist in perturbation theory around GFF.
        We explain why all diagonal minimal models admit an uplift and we show exact results for correlators and CFT data of the 4d uplift of the Ising model. Despite being strongly coupled 4d CFTs, the uplifted minimal models contain infinitely many conserved currents and are expected to be integrable.

        Orateur: Emilio Trevisani (CNRS - Sorbonne Université)
    • 11:00 11:30
      Coffee Break Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot (College de France)

      Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot

      College de France

      11, place Marcelin Berthelot, 75005 Paris, France
    • 11:30 12:30
      Formal theory Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot (College de France)

      Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot

      College de France

      11, place Marcelin Berthelot, 75005 Paris, France
      • 11:30
        Arithmetic Chaos Inside Black Holes 1h

        It has been known for over 50 years that spacetime dynamics becomes chaotic in the approach to singularities. Furthermore, the classical gravitational dynamics exhibits remarkable number-theoretic properties known as arithmetic chaos. I will review these facts and give an explicit realisation of these phenomena in the interior of an asymptotically AdS black hole. I will discuss possible implications for the nature of black hole singularities and black hole thermodynamics.

        Orateur: Sean Hartnoll (University of Cambridge)
    • 14:30 15:30
      Formal theory Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot (College de France)

      Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot

      College de France

      11, place Marcelin Berthelot, 75005 Paris, France
      • 14:30
        Tracking celestial and Carrollian theories 1h

        In this talk, I will present recent developments towards formulating a holographic correspondence for asymptotically flat spacetimes. In particular, I will discuss the role of newly uncovered symmetries in the so-called celestial and Carrollian holographic proposals.

        Orateur: Laura Donnay (SISSA)
    • 15:30 16:00
      Coffee Break Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot (College de France)

      Amphithéâtre Maurice Halbwachs, Site Marcelin Berthelot

      College de France

      11, place Marcelin Berthelot, 75005 Paris, France
    • 10:30 11:00
      Coffee Break 30m Conf IV, 2nd floor, ENS

      Conf IV, 2nd floor, ENS

    • 11:00 12:00
      Formal theory Conf IV, 2nd floor, ENS

      Conf IV, 2nd floor, ENS

      Président de session: Miguel Fernandes Paulos (Ecole Normale Superieure)
      • 11:00
        Nonrelativistic conformal field theory 1h

        We will review the notions of Schrödinger symmetry and nonrelativistic conformal field theory, in particular the restrictions that Schrödinger symmetry imposes on correlation function and the operator-state correspondence. We will then consider the most important example of NRCFT --- fermions at unitarity, and derive physical consequences of the formalism.

        Orateur: Prof. Dam Son
    • 10:30 11:00
      Coffee Break 30m Conf IV, 2nd floor, ENS

      Conf IV, 2nd floor, ENS

    • 11:00 12:00
      Formal theory Conf IV, 2nd floor, ENS

      Conf IV, 2nd floor, ENS

      Président de session: Miguel Fernandes Paulos (Ecole Normale Superieure)
      • 11:00
        The dual of semi-classical gravity 1h

        Recent work has produced a consistent picture of the holographic dual description of semi-classical gravity. I will describe this picture, several applications of this picture including the factorization puzzle and the information paradox, and some open questions.

        Orateur: Prof. Jan de Boer
    • 14:00 15:00
      Formal theory Conf IV, 2nd floor, ENS

      Conf IV, 2nd floor, ENS

      Président de session: Miguel Fernandes Paulos (Ecole Normale Superieure)
      • 14:00
        Energy Reflection and Transmission at 2D Holographic Interfaces 1h

        Scattering from conformal interfaces in two dimensions is universal in that the flux of reflected and transmitted energy does not depend on the details of the initial state. In this talk, I will present two gravitational calculations of the energy reflection and transmission coefficients for interfaces with holographic duals. I will first consider a thin-brane holographic toy model which is often used in the context of entanglement islands and black hole evaporation. I will demonstrate that the result for the reflection coefficient there depends monotonically on the tension of the brane. I will then extend the calculation to smooth domain-walls in 3-dimensional gravity. As an application, I will compute the transmission coefficient of a Janus interface in terms of its deformation parameter. I will demonstrate that both results obey bounds derived from the ANEC in conformal field theory.

        Orateur: Prof. Shira Chapman
    • 15:00 15:30
      Coffee Break 30m Conf IV, 2nd floor, ENS

      Conf IV, 2nd floor, ENS

    • 10:30 11:00
      Coffee Break 30m Conf IV, 2nd floor, ENS

      Conf IV, 2nd floor, ENS

    • 11:00 12:00
      Formal theory Conf IV, 2nd floor, ENS

      Conf IV, 2nd floor, ENS

      Président de session: Miguel Fernandes Paulos (Ecole Normale Superieure)
      • 11:00
        The entropy of Holographic CFTs at large charge and angular momentum 1h

        Black holes in AdS$_d$ (with $d\ geq 4$) are always unstable at large angular momentum, and sometimes unstable at large charge. In this talk we present proposals for the end point of these instabilities. Our constructions suggest new entropy formulae for ${\cal N}=4$ Yang-MIlls in the neighbourhood of extremality, and and in particular on the BPS manifold.

        Orateur: Prof. Shiraz Minwalla
    • 14:00 15:00
      Formal theory Conf IV, 2nd floor, ENS

      Conf IV, 2nd floor, ENS

      • 14:00
        Toward stringy horizons 1h
        Orateur: Prof. Hong Liu
    • 15:00 15:30
      Coffee Break 30m Conf IV, 2nd floor, ENS

      Conf IV, 2nd floor, ENS

    • 09:00 10:15
      Costas Bachas day Amphithéâtre Jean Jaurès (ENS)

      Amphithéâtre Jean Jaurès

      ENS

      24 Rue Lhomond, 75005 Paris, France
      • 09:00
        AdS3/CFT2 @ free point and beyond 25m
        Orateur: Matthias Gaberdiel (ETH Zurich)
      • 09:25
        Costas Bachas: (personal) strings 25m
        Orateur: Dieter Luest (Max-Planck-Institut fuer Physik, Ludwig-Maximilians-Universitaet)
      • 09:50
        Two Tales about 2d CFTs 25m
        Orateur: Hirosi Ooguri
    • 10:15 10:45
      Coffee Break Amphitheater Jean Jaurès (ENS)

      Amphitheater Jean Jaurès

      ENS

    • 10:45 12:25
      Costas Bachas day Amphithéâtre Jean Jaurès (ENS)

      Amphithéâtre Jean Jaurès

      ENS

      24 Rue Lhomond, 75005 Paris, France
      • 10:45
        Novel Modular Forms Arising in Correlators in N=4 SYM 25m
        Orateur: Michael Green
      • 11:10
        Defects in fully extended TQFT -- A tour in pictures 25m
        Orateur: Ilka Brunner
      • 11:35
        Interpolating between QFT and machine learning 25m

        Costas Bachas and I wrote several papers together on conformal field theory
        and Dirichlet branes. In this talk I will try to connect these topics with my more recent
        interests in machine learning.

        Orateur: Michael Douglas
      • 12:00
        BH and fuzzball perturbations from a gauge theory perspective 25m
        Orateur: Massimo Bianchi
    • 14:00 15:15
      Costas Bachas day Amphithéâtre Jean Jaurès (ENS)

      Amphithéâtre Jean Jaurès

      ENS

      24 Rue Lhomond, 75005 Paris, France
      • 14:00
        Magnetic charges in gravity 25m
        Orateur: Chris Hull
      • 14:25
        Back to D-Branes & Black Hole Information 25m
        Orateur: Erik Verlinde
      • 14:50
        From AdS_3 to Carroll fever and flat mania 25m
        Orateur: Marios Petropoulos
    • 15:15 15:45
      Coffee Break Amphitheater Jean Jaurès, ENS

      Amphitheater Jean Jaurès, ENS

    • 15:45 17:25
      Costas Bachas day Amphithéâtre Jean Jaurès (ENS)

      Amphithéâtre Jean Jaurès

      ENS

      24 Rue Lhomond, 75005 Paris, France
      • 15:45
        The omnipresence of the Arrow of Time 25m Amphithéâtre Jean Jaurès

        Amphithéâtre Jean Jaurès

        ENS

        24 Rue Lhomond, 75005 Paris, France
        Orateur: Vasilis Papadopoulos
      • 16:10
        Exponential S-matrix for Classical Observables 25m Amphithéâtre Jean Jaurès

        Amphithéâtre Jean Jaurès

        ENS

        24 Rue Lhomond, 75005 Paris, France
        Orateur: Pierre Vanhove (IPhT CEA-Saclay)
      • 16:35
        Physics with Costas: exploring the String Landscape 25m Amphithéâtre Jean Jaurès

        Amphithéâtre Jean Jaurès

        ENS

        24 Rue Lhomond, 75005 Paris, France
        Orateur: Igniatios Antoniadis (Ecole Polytechnique Centre de Physique Theorique (CPHT))
      • 17:00
        Supersymmetry Breaking Cascade Flow from N=2 to adjoint QCD 25m ATTN: via zoom

        ATTN: via zoom

        Orateur: Eric D'Hoker
    • 10:30 12:00
      Phenomenology Conf IV, 2nd floor (ENS)

      Conf IV, 2nd floor

      ENS

      24 Rue Lhomond, 75005 Paris, France
      Président de session: Kallia Petraki (ENS and Sorbonne University)
    • 14:00 16:30
      Phenomenology Conf IV, 2nd floor (ENS)

      Conf IV, 2nd floor

      ENS

      24 Rue Lhomond, 75005 Paris, France
      Président de session: Raffaele DAgnolo
      • 14:00
        Gravitational waves from axion strings 1h
        Orateur: Edward Hardy
      • 15:00
        Coffee break 30m
      • 15:30
        Axions from the Quantum Gravity Viewpoint 1h
        Orateur: Matt Reece (Harvard)
    • 10:30 12:00
      Phenomenology Conf IV, 2nd floor (ENS)

      Conf IV, 2nd floor

      ENS

      24 Rue Lhomond, 75005 Paris, France
      Président de session: Raffaele DAgnolo
      • 10:30
        Coffee break 30m
      • 11:00
        The Piezoaxionic Effect: dark matter detection and new forces 1h
        Orateur: Amalia Madden (Perimeter Institute)
    • 14:00 15:30
      Phenomenology Conf IV, 2nd floor (ENS)

      Conf IV, 2nd floor

      ENS

      24 Rue Lhomond, 75005 Paris, France
      Président de session: Kallia Petraki (ENS and Sorbonne University)
      • 14:00
        DETOX haloscope first results 1h
        Orateur: Arnaud Thery (ENS)
      • 15:00
        Coffee break 30m