Jeudi 6 Novembre 2025, 10:00 à IHP, Grisvard (314)	RENC-THEO (Rencontres Théoriciennes)	hep-th
Matthew Walters ( Henriot-Watt University )	Energy Correlators in CFTs
Abstract:	One useful observable for studying QFT dynamics is the correlation between the total energy flux in different directions on the celestial sphere. I will discuss the computation of these energy correlators in the specific case of conformal field theories, where they can be obtained as a sum over conformal blocks. After reviewing some general properties of energy correlators in CFTs, I will show how they can be used to derive novel bounds on OPE coefficients involving the stress- energy tensor.

Jeudi 6 Novembre 2025, 11:30 à IHP, Grisvard (314)	RENC-THEO (Rencontres Théoriciennes)	hep-th
Dominik Neuenfeld ( University of Würzburg )	The Flat Limit of AdS Coupled to a Bath
Abstract:	In this talk I'll explain how to take a well-defined flat-space limit of brane models of AdS coupled to a non-gravitating bath. In the dual BCFT this amounts to a triple-scaling limit where both the number of boundary degrees of freedom and the boundary coupling are taken to infinity while the BCFT boundary piecewise approaches a lightcone. The resulting construction offers a new approach to study the relation between the flat limit of AdS and Carrollian/Celestial CFT, as well as the potential to carry over ideas from AdS/CFT to flat space. I will discuss some implications for entanglement entropy in flat space, in particular the fact that two different notions of entanglement entropy arise on scri, depending on whether one traces out modes which have left through scri.

Jeudi 6 Novembre 2025, 14:00 à ESPCI, Room Holweck, building C, 1st floor, 10 rue Vauquelin, ESPCI ( Zoom link available at seminaires-lpem@espci.fr )	SEM-EXCEP (Seminaire exceptionnel)	cond-mat
Julien Chaste ( C2N, centre de nanoscience et nanotechnologies, 91120 Palaiseau )	Cartography of Thermal conductivity in 2D material, beyond standard model for out-of-plane and in-the-plane
Fichiers attachés:	abstract_J_Chaste.pdf (153600 bytes)

Jeudi 6 Novembre 2025, 14:00 à LPTMC, Jussieu, LPTMC seminar room, towers 13-12, 5th floor, room 523	SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée)	cond-mat
Jérôme Dubail ( CESQ Strasbourg )	Out-of-equilibrium dynamics of one-dimensional Bose gases
Abstract:	Considerable progress has taken place in recent years in modeling the large-scale dynamics of one- dimensional quantum many-body systems that are nearly integrable, thanks to the advent of Generalized Hydrodynamics in 2016. In particular, Generalized Hydrodynamics provides a computationally efficient tool for simulating experiments on out-of-equilibrium dynamics of ultracold quantum gases of bosonic atoms trapped in one-dimensional tubes. These one-dimensional gases, also known by theorists as the Lieb- Liniger gas, display peculiar dynamical behavior. I will give a brief overview of the theoretical and experimental progress made on this topic since 2016, and I will present our recent results on a new experimental protocol for measuring the asymptotic momenta of the atoms (also known as "rapidities") which allow us to experimentally map out the entire out-of-equilibrium state of the gas by directly accessing the phase-space distribution of quasi-particles.

Vendredi 7 Novembre 2025, 11:00 à LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage	SEM-INFOR (Séminaire informel)	hep-th
Pyry Kuusela	Hodge Structures of Complex Multiplication Type from Rational Conformal Field Theories
Abstract:	Apart from possessing a rich mathematical theory on their own, Hodge structures provide many interesting connections between geometry and physics. One of these connections is a conjectured correspondence between conformal field theories and Hodge structures: Gukov and Vafa have proposed that a conformal field theory describing a string compactification on a manifold is rational (an RCFT) if and only if the manifold admits complex multiplication (CM). In a recent paper [arXiv:2510.25708] with H. Jockers and M. Sarve, we investigated the Gukov-Vafa proposal by constructing Hodge structures of CM type from RCFT data. Depending on the interests of the audience, I could begin by reviewing CM and central concepts of RCFTs in some detail. After this, I could explain how the RCFT boundary states can be used to form the rational vector space H_Q with the chiral states giving the gradings H_C^(p,q) of its complexification. Using the known notion of Galois symmetry of RCFTs and some elementary Galois theory, we were able to show that these Hodge structures are of CM-type, subject to some technical assumptions that can be verified explicitly for large classes of theories. Time permitting, I could also discuss some interesting connections of complex multiplication to arithmetic geometry.

Lundi 10 Novembre 2025, 14:00 à IHES, Amphithéâtre Léon Motchane ( Séminaire Géométrie et groupes discrets )	MATH-IHES (TBA)	math
Frédéric Paulin ( Université Paris-Saclay )	Divergent Geodesics in Hyperbolic Manifolds and Arithmetic Applications
Abstract:	We give an asymptotic formula for the number of common perpendiculars with length tending to infinity between two divergent geodesics in finite volume real hyperbolic manifolds, presenting a surprising non-purely exponential growth. We apply this result to count ambiguous geodesics in the modular curve, recovering results of Sarnak, and to prove a conjecture of Motohashi on the binary additive divisor problem in imaginary quadratic number fields. This is joint work with Jouni Parkkonen.

Lundi 10 Novembre 2025, 16:00 à IHES, Amphithéâtre Léon Motchane ( Séminaire Géométrie et groupes discrets )	MATH-IHES (TBA)	math
Samuel Bronstein ( MPIMS Leipzig )	Geometry and Dynamics of Cyclic Higgs Bundles in the Slodowy Slices
Abstract:	The nonabelian Hodge correspondence provides a parametrization of the character variety of a surface group in a semisimple Lie group G by objects called Higgs bundles (which we will introduce). Among them, cyclic Higgs bundles stand out as candidates for representations with strong geometric properties. The Slodowy slice is a natural set of deformations of a Fuchsian representation in G, whose properties are yet to be described. In this talk, I will present some cases in which we are able to prove that representations in the cyclic Slodowy slice are Anosov, hence discrete and faithful, and correspond to some geometric structure that we describe. This is joint work with Colin Davalo and Qiongling Li.

Mercredi 12 Novembre 2025, 10:00 à LPTHE, LPTHE library ( Entanglement asymmetry workshop: https://indico.global/e/asymmetry )	WORK-CONF (Workshop or Conference)	cond-mat.stat-mech|hep-th|quant-ph
Sara Murciano ( LPTMS, Paris )	Entanglement asymmetry: what, when and why

Mercredi 12 Novembre 2025, 11:00 à IJCLAB, 100/2-A201 - Salle A201 (IJCLab) ( https://indico.ijclab.in2p3.fr/event/12349/ )	IJCLAB-HEP (Particle Physics Seminars at IJCLab)	hep-ph
Renaud Boussarie ( École polytechnique )	Top-down approach to repairing BK evolution
Abstract:	The Balitsky-Kovchegov (BK) equation, the non-linear evolution equation for gluon distributions in the saturation regime, is known to be problematic when approaching collinear kinematics. This has led to instabilities and even further to negative values for cross section estimates in saturation phenomenology. Several ad hoc solutions to this issue have been proposed with some success in improving stability in arbitrary ways, but so far no fully consistent and generalizable scheme has been discussed. I will present a top-down approach which fixes the problem in a mathematically consistent and a physically meaningful way, from which we can make sense of the previously proposed schemes.

Mercredi 12 Novembre 2025, 11:00 à LPTMC, campus Jussieu, couloir 12-13, 5ème étage, salle 5-23	SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée)	cond-mat
Lucien Jezequel ( KTH )	The "Mode-Shell" correspondence, a unifying concept in topological physics
Abstract:	In quantum or classical wave systems, some properties of wave systems are known to be topologically protected. Due to their increased robustness, such properties have attracted much interest in the past decades. The most studied case is the existence of unidirectional edge states in the quantum Hall effect and, more generally, the existence of protected states at the edges of topologically insulators. An important result is then the bulk-edge correspondence that links the existence of topological edge states to a topological index defined in the volume of the material. This is not the only case studied in topological physics and different, yet similar, results have been obtained for topological semimetals, higher order insulators or continuous wave systems. In this talk I will explain how all these results can be understood in a unifying theory using the mode-shell correspondence formalism which relates the existence of isolated topological modes in phase space, to a topological invariant defined in the surface which encloses these modes in phase space. Invariant that reduces to Chern or winding numbers in the semiclassical limit. Mode-shell correspondence, a unifying phase space theory in topological physics [1] Part I: Chiral number of zero-modes https://www.scipost.org/10.21468/SciPostPhys.17.2.060 [2] Part II: Higher-dimensional spectral invariants https://arxiv.org/abs/2501.13550

Mercredi 12 Novembre 2025, 11:00 à LPTHE, LPTHE library ( Entanglement asymmetry workshop: https://indico.global/e/asymmetry )	WORK-CONF (Workshop or Conference)	cond-mat.stat-mech|hep-th|quant-ph
Luca Capizzi ( LPTMS, Paris )	Entanglement asymmetry in the ordered phase of many-body systems: the Ising Field Theory

Mercredi 12 Novembre 2025, 12:00 à LPTHE, LPTHE library ( Entanglement asymmetry workshop: https://indico.global/e/asymmetry )	WORK-CONF (Workshop or Conference)	cond-mat.stat-mech|hep-th|quant-ph
Florent Ferro ( LPTMS, Paris )	TBA

Mercredi 12 Novembre 2025, 14:00 à LPENS, L378 ( note the unusual time )	FORUM-ENS (Forum de Physique Statistique @ ENS)	cond-mat.stat-mech
Maxime Debertolis	Natural super-orbitals representation of many-body operators
Abstract:	We present the concept of natural super-orbitals for many-body operators, defined as the eigenvectors of the one-body super-density matrix associated with a vectorized operator. We relate these objects to measures of non- Gaussianity of operators associated to the occupations of the natural super-orbitals. We first analyze the general analytical properties of these objects for various typical examples, and then perform a numerical investigation of the natural super-orbitals corresponding to both the time-evolution operator and a time-evolved local operator in the t-V model and in a quantum impurity model. Occupations of the natural orbitals for both operators decay exponentially at all times. This indicates that only a small number of orbitals contribute significantly to quantum correlations, enabling a compact matrix-product-operator representation. This framework opens the door to future research that leverages the compressed structure of operators in their natural super-orbital basis, enabling for instance the computation of out-of-time-order correlators in large interacting systems over extended time scales.

Mercredi 12 Novembre 2025, 14:00 à IHES, Amphithéâtre Léon Motchane ( Seed Seminar of Mathematics and Physics )	SEED (Seed Seminar of Mathematics and Physics)	math-ph
Vincent Viau ( LAGA, USPN )	Supercritical Frozen Erdos-Rényi and Uniform Random Forests
Abstract:	The frozen Erdos-Rényi random graph is a variant of the standard dynamical Erdos-Rényi random graph that prevents the creation of the giant component by freezing the evolution of connected components with a unique cycle. The formation of multicyclic components is forbidden, and the growth of components with a unique cycle is slowed down, depending on a parameter $p\in[0,1]$ that quantifies the slowdown. In this talk, we will study the fluid limit of the main statistics of this process, that is their functional convergence as the number of vertices of the graph becomes large and after a proper rescaling, to the solution of a system of differential equations. The proof is based on the free forest property of the frozen model: the forest part of the graph is a uniform random forest. In order to prove the fluid limit results, we will explain how to study and count forests using conditioned random walks.

Mercredi 12 Novembre 2025, 14:30 à LPTHE, LPTHE library ( Entanglement asymmetry workshop: https://indico.global/e/asymmetry )	WORK-CONF (Workshop or Conference)	cond-mat.stat-mech|hep-th|quant-ph
Victor Godet ( LPTHE, Paris )	The central role of quantum information in holography

Mercredi 12 Novembre 2025, 14:45 à IHES, Centre de conférences Marilyn et James Simons ( Séminaire Amplitudes et Gravitation sur l’Yvette (IHES/IPhT) )	PT-IHES (Séminaire de physique théorique de l'IHES)	hep-th
Elisabetta Armanini ( EPFL )	From Partons to Strings: Scattering on the Coulomb branch of N = 4 SYM
Abstract:	We study scattering on the Coulomb branch of planar N=4 SYM. At weak 't Hooft coupling scattering amplitudes can be computed using Feynman diagrams and the relevant degrees of freedom are quarks and gluons. At strong 't Hooft coupling the dynamics is captured by string scattering in flat space. Dual conformal symmetry makes it possible to constrain the unitarity properties and the spectrum of the amplitude: bound states are encoded in the cusp anomalous dimension of a Maldacena-Wilson line with operators inserted at the cusp, which is fixed by integrability. In this talk, we show how to combine dual conformal invariance, integrability, worldsheet bootstrap and the S-matrix bootstrap to explore scattering at finite 't Hooft coupling. [Based on 2510.19909]

Mercredi 12 Novembre 2025, 15:15 à IHES, Amphithéâtre Léon Motchane ( Online talk streamed at IHES )	SEED (Seed Seminar of Mathematics and Physics)	math-ph
Vladimir Narovlansky ( School of Natural Sciences, Institute for Advanced Study, Princeton, USA )	Dualities between fermionic theories and the Potts model
Abstract:	We show that a large class of fermionic theories are dual to a $q\to0$ limit of the Potts model in the presence of a magnetic field. These can be described using a statistical model of random forests on a graph, generalizing the (unrooted) random forest description of the Potts model with only nearest neighbor interactions. We then apply this to find a statistical description of a recently introduced family of OSp(1|2M) invariant field theories that provide a UV completion to sigma models with the same symmetry.

Mercredi 12 Novembre 2025, 15:30 à LPTHE, LPTHE library ( Entanglement asymmetry workshop: https://indico.global/e/asymmetry )	WORK-CONF (Workshop or Conference)	cond-mat.stat-mech|hep-th|quant-ph
Stathis Vitouladitis ( ULB, Brussels )	Entanglement asymmetry and the limits of symmetry breaking

Mercredi 12 Novembre 2025, 16:30 à LPTHE, LPTHE library ( Entanglement asymmetry workshop: https://indico.global/e/asymmetry )	WORK-CONF (Workshop or Conference)	cond-mat.stat-mech|hep-th|quant-ph
Colin Rylands ( University of Coventry )	Asymmetry and entanglement of the entanglement asymmetry

Jeudi 13 Novembre 2025, 10:00 à LPTHE, LPTHE library ( Entanglement asymmetry workshop: https://indico.global/e/asymmetry )	WORK-CONF (Workshop or Conference)	cond-mat.stat-mech|hep-th|quant-ph
Amartya Harsh Singh ( SISSA, Trieste )	TBA

Jeudi 13 Novembre 2025, 11:00 à LPTHE, LPTHE library ( Entanglement asymmetry workshop: https://indico.global/e/asymmetry )	WORK-CONF (Workshop or Conference)	cond-mat.stat-mech|hep-th|quant-ph
Francesco Benini ( SISSA, Trieste )	TBA

Jeudi 13 Novembre 2025, 12:00 à LPTHE, LPTHE library ( Entanglement asymmetry workshop: https://indico.global/e/asymmetry )	WORK-CONF (Workshop or Conference)	cond-mat.stat-mech|hep-th|quant-ph
Neil Talwar ( SISSA, Trieste )	The Page curve for asymmetry

Jeudi 13 Novembre 2025, 14:00 à ESPCI, Room Boreau, building C, 2nd floor, 10 rue Vauquelin, ESPCI ( Zoom link available at seminaires-lpem@espci.fr )	SEM-EXCEP (Seminaire exceptionnel)	cond-mat
Ludovica Zullo ( Wuerzburg University )	A first-principles pathway to unlock emergent properties in misfit layer compounds
Abstract:	Misfit layer compounds (MLCs) are heterostructures composed of rocksalt units stacked with few-layers transition metal dichalcogenides (TMDs). Due to their complex composition, these heterostructures have long puzzled the crystallographic community: the research in the field of misfit layer compounds has mostly proceeded by isolated discoveries and trial-and-error chemical synthesis, while general rules to understand what happens when assembling different rocksalts and TMDs were still missing. We establish an original strategy to study their electronic and vibrational properties by deriving misfits’ physics from those of their constituent layers, unlocking their two-dimensional features [1-3]. By identifying the mechanism governing charge transfer, we demonstrate that misfits behave as a periodic arrangement of ultra-tunable field-effect transistors, allowing for massive and tunable chargings. We investigate misfits exhibiting phenomena such as charge-density waves and superconductivity in comparison with state-of-the-art experiments. Our work aims to guide the design of MLCs with targeted emergent properties for future device applications. [1] L. Zullo, G. Marini, T. Cren, M. Calandra, Nano Lett. 2023, 23, 14, 6658-6663 (2023). [2] L. Zullo*, G. Setnikar*, A. Pawbake, T. Cren, C. Brun, J. Cordiez, S. Sasaki, L. Cario, G. Marini, M. Calandra, and M.-A. Méasson, Phys. Rev. B 110, 075430 (2024). [3] L. Zullo, "Emergent properties of misfit layer compounds from first principles." (https://theses.hal.science/tel-04944761v1)

Jeudi 13 Novembre 2025, 14:30 à LPTHE, LPTHE library ( Entanglement asymmetry workshop: https://indico.global/e/asymmetry )	WORK-CONF (Workshop or Conference)	cond-mat.stat-mech|hep-th|quant-ph
Filiberto Ares ( SISSA, Trieste )	Entanglement asymmetry in random quantum states and circuits

Jeudi 13 Novembre 2025, 16:30 à LPTHE, LPTHE library ( Entanglement asymmetry workshop: https://indico.global/e/asymmetry )	WORK-CONF (Workshop or Conference)	cond-mat.stat-mech|hep-th|quant-ph
Angelo Russotto ( SISSA, Trieste )	TBA

Vendredi 14 Novembre 2025, 10:00 à LPTHE, LPTHE library ( Entanglement asymmetry workshop: https://indico.global/e/asymmetry )	WORK-CONF (Workshop or Conference)	cond-mat.stat-mech|hep-th|quant-ph
Giuseppe Di Giulio ( University of Stockholm )	Measurament-induced symmetry restoration and quantum Mpemba effect

Vendredi 14 Novembre 2025, 11:00 à LPTHE, LPTHE library ( Entanglement asymmetry workshop: https://indico.global/e/asymmetry )	WORK-CONF (Workshop or Conference)	cond-mat.stat-mech|hep-th|quant-ph
Michele Mazzoni ( University of Bologna )	Breaking global symmetries with locality-preserving operations

Vendredi 14 Novembre 2025, 12:00 à LPENS, L378	ENS-BIOPHYS (ENS Biophysics Seminar)	physics.bio-ph
Alicia Damm ( University of Düsseldorf )	TBA

Vendredi 14 Novembre 2025, 12:00 à LPTHE, LPTHE library ( Entanglement asymmetry workshop: https://indico.global/e/asymmetry )	WORK-CONF (Workshop or Conference)	cond-mat.stat-mech|hep-th|quant-ph
Sridip Pal ( IHES, Paris )	Thermal Effective field theory, Entanglement & Strong (A-)symmetry

Mardi 18 Novembre 2025, 10:45 à LPTMC, campus Jussieu, couloir 12-13, 5ème étage, salle 5-23	SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée)	cond-mat
Thibault Scoquart ( LPT Toulouse/LPTMC )	TBA