Jeudi 20 Novembre 2025, 10:00 à IHP, Salle Yvette Cauchois, Bâtiment Perrin	RENC-THEO (Rencontres Théoriciennes)	hep-th
Matilda Delgado ( Max Planck Institute for Physics, Munich )	Hamiltonian Cobordism
Abstract:	I will discuss states charged under global symmetries detected by the Cobordism Conjecture in Quantum Gravity theories and examine when such states can be realized as smooth, finite-energy configurations in asymptotically flat spacetime. Assuming standard energy conditions on the stress-energy tensor, I will show that no such regular configurations exist when the relevant bordism generators fail to admit a metric of positive scalar curvature. For such symmetries, the charged states should therefore be singular, involve quantum matter that violates energy conditions or collapse the asymptotically flat spacetime. Such global symmetries are therefore not manifest in the IR. I will outline the implications of this for symmetries detected by spin bordism. Finally, I will consider the bordism groups of spin manifolds with positive scalar curvature and argue that they detect approximate global symmetries in the IR. Such symmetries are broken in the UV but from the low-energy perspective they signal the need to include energy condition-violating matter. Based on WIP with M. Montero and G. Tazzoli

Jeudi 20 Novembre 2025, 11:00 à IJCLAB, Bld. 210, Theory Seminar Room (114) ( https://indico.ijclab.in2p3.fr/event/12040/ )	IJCLAB-PTH (Particle Theory Seminar of IJCLAB Orsay)	hep-ph
Clara Murgui ( CERN )	Detecting particle-like interactions via coherently enhanced decoherence
Abstract:	Elusive particles, such as sub-GeV dark matter candidates or even the well-known neutrinos that decoupled one second after the Big Bang, may have evaded detection due to the tiny energy they deposit in detectors. Even when detected, experiments with energy thresholds are only sensitive to the high-q^2 region of the scattering rate, which is not the dominant contribution for many scenarios, such as dark- matter interactions mediated by long-range forces or low-momentum transfers that are Born-enhanced. In this talk, I will discuss the potential of atom interferometers to probe such particle-like interactions through an open-quantum-system framework and how this approach applies to dark matter searches. I will provide examples in which quantum-mechanically enhanced phase-shifts — induced collectively by the multiple atoms in the interferometer — could be tested in the laboratory. I will end by highlighting new, promising observables for discovering physics beyond the Standard Model.

Jeudi 20 Novembre 2025, 11:30 à IHP, salle Yvette Cauchois	RENC-THEO (Rencontres Théoriciennes)	hep-th
Sean Hartnoll	Towards a quantum lattice bootstrap
Abstract:	A “bootstrap” approach to physical systems starts from basic physical principles and aims to constrain the possible dynamics. Among the most successful instances have been the bootstrap of conformal field theories and the S-matrix bootstrap of relativistic field theories. I will explain how this methodology can be applied to quantum mechanical lattice models, such as arise in condensed matter systems. The basic quantity will be the retarded Green’s function, for which I will establish strong analyticity and boundedness properties starting from Lieb-Robinson causality in local lattice models (that I will also review). I will explain how these properties (bounds and analyticity) can be used to place constraints on transport coefficients and on non-Fermi liquid coupling constants.

Jeudi 20 Novembre 2025, 14:00 à LPENS, L378	LPENS-BQ (Balades Quantiques de le LPENS)	cond-mat.stat-mech
Michele Mazzoni ( Bologna )	Entanglement dynamics and Page curves in random permutation circuits
Abstract:	The characterization of ensembles of many-qubit random states and their realization via quantum circuits are crucial tasks in quantum-information theory. In this work, we study the ensembles generated by quantum circuits that randomly permute the computational basis, thus acting classically on the corresponding states. We focus on the averaged entanglement and present two main results. First, we derive generically tight upper bounds on the entanglement that can be generated by applying permutation circuits to arbitrary initial states. We show that the late-time "entanglement Page curves'' are bounded in terms of the initial state participation entropies and its overlap with the "maximally antilocalized'' state. Generally speaking, this result states that the quantum correlations generated by classical circuits are bounded in terms of some quantum property of the initial state (namely, the degree to which it can be written as a superposition of classical states). Second, comparing the averaged R\'enyi-$2$ entropies generated by (i) an infinitely deep random circuit of two-qubit gates and (ii) global random permutations, we show that the two quantities are different for finite $N$ but the corresponding Page curves coincide in the thermodynamic limit. We also discuss how these conclusions are modified by additional random phases or considering circuits of $k$-local gates with $k\geq 3$. Our results are exact and highlight the implications of classical features on entanglement generation in many-body systems. We certify the emergent quantum randomness using the frame potential and establish a mapping between its behavior and the statistical mechanics of a domain wall particle model. In both architectures, the effect of quantum measurements induces a nontrivial confinement mechanism, where domain walls are either trapped by an external potential or bound in pairs to form meson-like excitations. Our results, supported by both exact analytical calculations and numerical simulations, suggest that confinement is a general mechanism underlying random state generation in broader settings with local measurements, including quantum circuits and chaotic dynamics.

Jeudi 20 Novembre 2025, 14:00 à LPTM, 4.13	SEM-LPTM-UCP (Seminaires du LPTM , Universite de Cergy Pontoise)	cond-mat
Youri Nouchogkwe ( Smart Materials Unit, Luxembourg Institute of Science and Technology, Luxembourg )	Electrocaloric materials for efficient cooling
Abstract:	n this talk, I will discuss the electrocaloric effect in the ferroelectric capacitor lead scandium tantalate2 (PST), which exhibits a phase transition near room temperature—making it promising for practical cooling applications. I will also address its phase transition behavior and implementation in an actual cooling device3 . Furthermore, I will present a strategy to extend PST’s operational range through chemical doping

Vendredi 21 Novembre 2025, 11:00 à LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage	SEM-INFOR (Séminaire informel)	hep-th
Thorsten Schimannek	Revisiting the Quantum Geometry of Torus-fibered Calabi-Yau Threefolds

Vendredi 21 Novembre 2025, 15:00 à ESPCI, Room Charpak, entrance building, ground floor, 10 rue Vauquelin, Paris ( Zoom link available at seminaires-lpem@espci.fr )	SEM-EXCEP (Seminaire exceptionnel)	cond-mat
Andrew Millis ( Columbia University and the Flatiron Institute )	Magnetic, metal-insulator and superconducting transitions in Moire transition metal dicalcogenides
Abstract:	One unit cell thick layers of materials such as WSe$_2$ may be stacked one on top of the other at a small relative twist angle, creating a Moire' pattern characterized by a large unit cell. The resulting electronic structure is characterized by a nontrivial quantum geometry, interaction strength set by device configuration, and in-situ tunable electron density and band theory. The systems exhibit metallic, superconducting, fermi surface reconstructed (likely antiferromagnetic), and insulating phases. The unprecedented tunabilty allows a systematic experiment-theory comparison, enabling insights into the Mott transition, electronically mediated superconductivity and fundamental questions of transport in interacting electron systems. This talk reports will summarize recent experimental and theoretical work related to these questions. References: Nature 637, 839-845 (2025), PRR 6 033127 (2024), arXiv:2408.16075, arXiv:2412.14296, arXiv:2503.11763 arXiv:2506.22325 and to appear

Lundi 24 Novembre 2025, 10:30 à IHES, Amphithéâtre Léon Motchane ( Cours de l'IHES )	MATH-IHES (TBA)	math
Hong Wang ( IHES & New York University )	Union of Tubes and Kakeya Sets (1/3)
Abstract:	We discuss techniques (Cordoba argument, projection theory) to prove volume bounds on union of tubes in R^2 and R^3, with applications to the Kakeya problem. This is joint work with Josh Zahl.

Lundi 24 Novembre 2025, 11:00 à IPHT, Salle Claude Itzykson, Bât. 774	IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires)	physics
Valerio Scarani	A quantum wheel of fortune
Abstract:	Abstract: In this talk I shall review the work done in the past few years, inspired by a previously unnoticed observation by Tsirelson [1]: the Wigner negativity of some states of a single harmonic oscillator can be certified by measuring only one observable (say, position) at one among a set of suitable times. This is somewhat surprising, as it is common knowledge that the evolution of a harmonic oscillator is identical to the classical one in the Heisenberg representation.  We improved the characterization of the original protocol for continuous variables and extended it to discrete variables [2,3], the latter case leading to the first experimental implementation [4]. We also modified the protocol to detect entanglement: for continuous variables, it gives an entanglement witness that is free of false positives [5]; for discrete variable, we reported the first witness that detects the GHZ state of N spins using only measurements of the total angular momentum [6,7]. On a more foundational level, the task being operational, it can be phrased in the language of generalized probabilistic theories: contrary to what happens for Bell inequalities, here quantum theory can always reach the maximal score [8] References: [1] B. Tsirelson, https://arxiv.org/abs/quant-ph/0611147 [2] L.H. Zaw et al., Phys. Rev. A 106, 032222 (2022) https://arxiv.org/abs/2204.10498 [3] L.H. Zaw, V.S., npj Quantum Information 11, 152 (2025) https://arxiv.org/abs/2411.03132 [4] A. Vartjees et al., Newton 1, 100017 (2025) https://arxiv.org/abs/2410.07641 [5] P. Jayachandran et al., Phys. Rev. Lett. 130, 160201 (2023) https://arxiv.org/abs/2210.10357 [6] K.-N. Huynh-Vu et al., Phys. Rev. A 109, 042402 (2024) https://arxiv.org/abs/2311.00806 [7] J. Chen et al., Phys. Rev. A 110, 062408 (2024) https://arxiv.org/abs/2410.07641[8] L.H. Zaw et al. Phys. Rev. Lett. 134, 190201 (2025) https://arxiv.org/abs/2401.16147

Lundi 24 Novembre 2025, 11:30 à LPTMC, tours 12-13, salle 523	ATOMES-NCORPS (Seminaire atomes froids et problemes a N corps)	cond-mat
Nicolas Dupuis ( LPMTC )	Universal thermodynamics and two-body contact of a Bose gas near the superfluid–Mott-insulator transition

Lundi 24 Novembre 2025, 14:00 à LPNHE, Charpak	LPNHE (Séminaires du LPNHE)	physics
Baptiste Ravina ( LPTHE )	Toponium at the LHC: a new frontier in top-quark physics
Abstract:	The top quark, the heaviest known elementary particle, has long been thought unable to form bound states. However, intriguing hints in recent LHC data suggest that toponium, a short-lived quasi-bound state of a top-antitop pair, might have left observable traces in data and possibly even been discovered. In this seminar, we will discuss why toponium is a unique laboratory for studying the theory of the strong interaction in the non-relativistic regime and how modern theoretical techniques allow bound-state effects to be incorporated into state-of-the-art collider simulations. We will then review experimental signatures that could reveal the presence of toponium in current and future LHC data and finally, highlight recent ATLAS measurements showing an excess of events near threshold consistent with toponium formation, compare them with CMS results and theoretical expectations, and outline prospects for further investigation. Together, this will offer a comprehensive overview of the current status and future directions for using toponium as a new window into the physics of the top quark.

Lundi 24 Novembre 2025, 15:00 à LPTHE, LPTHE library	SEM-LPTHE (Séminaire du LPTHE)	hep-th
Jani Kastikainen ( University of Würzburg )	Driven inhomogeneous CFT as a theory in curved space-time
Abstract:	Driven quantum systems exhibit a large variety of interesting and sometimes exotic phenomena. In this talk, for two-dimensional conformal field theories (CFTs) driven by evolving background space-time metrics in a closed universe, I present an operator formulation as a driven inhomogeneous CFT. I solve the anomalous Ward identities for the renormalized stress tensor operator of the CFT in curved space-time and show that there exists a special renormalization scheme, the chirally split scheme, in which the solution is consistent with the presence of two commuting copies of the Virasoro algebra. Based on this, I derive the Schrödinger picture Hamiltonian operator and show that unitary time-evolution of the CFT in the background metric is equivalent to unitary evolution of the inhomogeneous CFT. I discuss simple correlation functions, entanglement entropy and their scheme dependence in the curved background. Depending on time constraints, I will present the corresponding holographic dual geometry in 3D gravity extending previous results to general driving. The talk is based on arXiv:2306.00099, arXiv:2409.08319 and arXiv:2508.18350.

Mardi 25 Novembre 2025, 10:00 à IHES, Amphithéâtre Léon Motchane ( Cours de l'IHES )	MATH-IHES (TBA)	math
Hong Wang ( IHES & New York University )	Union of Tubes and Kakeya Sets (2/3)
Abstract:	We discuss techniques (Cordoba argument, projection theory) to prove volume bounds on union of tubes in R^2 and R^3, with applications to the Kakeya problem. This is joint work with Josh Zahl.

Mardi 25 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
Vincent Ouazan-Reboul ( LPTMS )	Complex interactions in and out of equilibrium
Abstract:	One of the main challenges in the modeling of biological systems is that their physical behavior at all scales is dictated by intricate interactions between many different complex objects. In this talk, I will present theoretical results on two different systems where complex interactions play a key role, one equilibrium and the other active. I will first discuss the equilibrium self-assembly of proteins, which can be seen as particles with short-range anisotropic interactions. Strikingly, proteins with vastly different physico-chemical properties tend to form into similar fibrous pathological aggregates. By performing lattice Monte-Carlo simulations of three-dimensional particles, I will show that complex anisotropic iteractions lead to a great morphological diversity in the resulting assemblies. In particular, many choices of interactions lead to the formation of fibers, which are found to result from geometrical frustration. On the other hand, I will also demonstrate that anisotropy is a useful design tool for controlling the size and shape of equilibrium aggregates. In a second part, I will discuss the self-organization of mixtures of enzyme-like active particles. As opposed to the previous system, these objects are intrinsically out of equilibrium, and develop isotropic, long-ranged, non-reciprocal interactions. By using a combination of linear stability analysis and Brownian dynamics simulations, I will show that catalytically active particles can self-organize into droplet-like structures. My focus will be on the case where different species of enzymes participate in a biochemical reaction network. This different type of complexity, which stems from the existence of an intricate interaction network between different species instead of structural anisotropy, can be an intrinsic driver of self-organization and lead to novel collective dynamics.

Mardi 25 Novembre 2025, 14:00 à IJCLAB, A201	NUC-THEO (Séminaire de physique nucléaire théorique)	nucl-th
Tokuro Fukui ( Kyushu University )	Uncovering the mechanism of chiral three-nucleon force in driving spin-orbit splitting
Abstract:	We clarify the relationship between spin–orbit (SO) splitting and three-nucleon forces (3NFs) derived from chiral effective field theory. While the influence of 3NFs on enhancing SO splitting is well known, the mechanisms underlying this enhancement have remained elusive. Through the irreducible tensor decomposition of the chiral 3NF, our investigation reveals that the rank-1 tensor component of the 3NF contributes primarily to the SO splitting in light nuclei. We also discuss the antisymmetric nature of the rank-1 3NF, which is akin to the Dzyaloshinsky-Moriya interaction causing the spin canting in magnetic ions.
Fichiers attachés:	Abstract.pdf (189154 bytes)

Mercredi 26 Novembre 2025, 10:00 à IHES, Centre de conférences Marilyn et James Simons ( Cours de l'IHES )	MATH-IHES (TBA)	math
Hong Wang ( IHES & New York University )	Union of Tubes and Kakeya Sets (3/3)
Abstract:	We discuss techniques (Cordoba argument, projection theory) to prove volume bounds on union of tubes in R^2 and R^3, with applications to the Kakeya problem. This is joint work with Josh Zahl.

Mercredi 26 Novembre 2025, 10:30 à IHES, Amphithéâtre Léon Motchane ( Online talk streamed at IHES )	SEED (Seed Seminar of Mathematics and Physics)	math-ph
Giuseppe Scola ( UNICAL (Università della Calabria) )	Non-trivial Fixed Point of a \psi^4_d Fermionic Theory: Anomalous Exponent and Scaling Operators
Abstract:	We consider the Renormalization Group (RG) fixed-point theory associated with a fermionic \psi^4_d model in d = 1, 2, 3 with fractional kinetic term, whose scaling dimension is fixed so that the quartic interaction is weakly relevant in the RG sense. The model is defined in terms of a Grassmann functional integral with interaction V*, solving a fixed-point RG equation in the presence of external fields, and a fixed ultraviolet cutoff. We define and construct the field and density scale-invariant response functions, and prove that the critical exponent of the former is the naive one, while that of the latter is anomalous and analytic. We construct the corresponding (almost-)scaling operators, whose two point correlations are scale-invariant up to a remainder term, which decays like a stretched exponential at distances larger than the inverse of the ultraviolet cutoff. Our proof is based on constructive RG methods and, specifically, on a convergent tree expansion for the generating function of correlations, which generalizes the approach developed by three of the authors in a previous publication (Giuliani et al. in JHEP 01:026, 2021. https://doi.org/10.1007/JHEP01(2021)026). CMP 406.10 (2025): 257, joint work with A. Giuliani, V. Mastropietro and S. Rychkov.

Mercredi 26 Novembre 2025, 11:00 à LPENS, L378	FORUM-ENS (Forum de Physique Statistique @ ENS)	cond-mat.stat-mech
Lenart Zadnik ( University of Ljubljana )	Elusive hierarchy of relaxation times in quantum kinetically constrained models
Abstract:	In this talk I will describe the mechanism of slow heterogeneous relaxation in quantum kinetically constrained models (KCMs) in which the potential energy strength is controlled by a coupling parameter. Interpreting this coupling as a counting field provides access to the trajectory (history) statistics in classical KCMs of structural glasses. I will, however, focus primarily on the inactive phase—the regime of slow dynamics—in the context of quantum unitary evolution. This regime includes the large-coupling limit. By expanding around that limit one finds a nested hierarchy of states that remain frozen on time scales determined by powers of the coupling. Classification of such states, together with the evolution of their Krylov complexity, reveal that these time scales are related to the distances between the sites where facilitated dynamics is allowed by the kinetic constraint. While correlations within frozen states relax slowly and exhibit metastable plateaus that persist on time scales set by powers of the coupling parameter, the correlations in the rest of the states decay rapidly. I will describe how to compute the plateau heights in correlation functions and discuss the elusive nature of the time-scale hierarchy in thermodynamically large systems. The results presented in this talk explain the observed slow relaxation in quantum KCMs and elucidate dynamical heterogeneity in such models by relating the relaxation times to the spatial separations between the active regions. Based on: — V Marić, L Paljk, LZ, arXiv:2510.03159 — LZ, JP Garrahan, Physical Review B 108 (10), L100304 (2023)

Mercredi 26 Novembre 2025, 11:00 à IJCLAB, 100/2-A201 - Salle A201 (IJCLab) ( https://indico.ijclab.in2p3.fr/event/12350/ )	IJCLAB-HEP (Particle Physics Seminars at IJCLab)	hep-ph
Luca Maxia ( LPTHE, Sorbonne Université )	On the inclusive production of $J/\psi$ at the EIC in a TMD framework
Abstract:	In contrast with the quark counterparts, gluon distributions that include transverse momentum and spin effects are still poorly known. It is therefore important to identify observables sensitive to gluons. A proper framework to investigate these distributions is then the transverse momentum dependent (TMD) factorization. As a potential source of data to probe gluon TMDs, Higgs production is a valuable playground, but it is mostly sensitive to the high energy region. Thus, complementary information could in principle be achieved by investigating lower energy states, including quarkonia (and especially $J/\psi$). In this regard, the electron-ion collider is expected to have a crucial role in the relatively near future. However, to single out information about the initial state, it is first necessary to understand the behavior of the final state. This, in turn, requires the adoption of the proper TMD factorization which includes quarkonium formation. Recent developments have demonstrated that a novel transverse momentum dependent (TMD) quantity must be introduced: the TMD shape function (TMD-ShF). The function can be seen as a generalization of the long-distance matrix elements (LDME) that characterize the nonrelativistic QCD (NRQCD) approach. In this talk, I aim to illustrate the impact of the TMD-ShF on $J/\psi$ yields in SIDIS at the EIC. I will therefore first introduce this TMD quantity. I will then combine the TMD expression with the collinear one to obtain predictions valid at all transverse momenta. Finally, I will present numerical results based on this framework to quantify the expected impact of the TMD-ShF on $J/\psi$ cross section and asymmetries.

Mercredi 26 Novembre 2025, 11:00 à IPHT, Salle Claude Itzykson, Bât. 774	IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires)	hep-th
Thomas Van Riet ( KU Leuven )	TBA
Abstract:	TBA

Mercredi 26 Novembre 2025, 11:45 à IHES, Amphithéâtre Léon Motchane	SEED (Seed Seminar of Mathematics and Physics)	math-ph
Camille Cazaux ( LPSM )	TBA

Jeudi 27 Novembre 2025, 11:00 à LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage	SEM-DARBOUX (Séminaire Darboux - physique théorique et mathématiques)	hep-th
Fathi Ben Aribi ( IMJ-PRG )	TBA

Vendredi 28 Novembre 2025, 12:00 à LPENS, L378	ENS-BIOPHYS (ENS Biophysics Seminar)	physics.bio-ph
Vincent Oauzan-Reboul ( LPTMS )	Complex interactions in and out of equilibrium
Abstract:	One of the main challenges in the modeling of biological systems is that their physical behavior at all scales is dictated by intricate interactions between many different complex objects. In this talk, I will present theoretical results on two different systems where complex interactions play a key role, one equilibrium and the other active. I will first discuss the equilibrium self-assembly of proteins, which can be seen as particles with short-range anisotropic interactions. Strikingly, proteins with vastly different physico-chemical properties tend to form into similar fibrous pathological aggregates. By performing lattice Monte-Carlo simulations of three- dimensional particles, I will show that complex anisotropic iteractions lead to a great morphological diversity in the resulting assemblies. In particular, many choices of interactions lead to the formation of fibers, which are found to result from geometrical frustration. On the other hand, I will also demonstrate that anisotropy is a useful design tool for controlling the size and shape of equilibrium aggregates. In a second part, I will discuss the self-organization of mixtures of enzyme-like active particles. As opposed to the previous system, these objects are intrinsically out of equilibrium, and develop isotropic, long-ranged, non- reciprocal interactions. By using a combination of linear stability analysis and Brownian dynamics simulations, I will show that catalytically active particles can self-organize into droplet-like structures. My focus will be on the case where different species of enzymes participate in a biochemical reaction network. This different type of complexity, which stems from the existence of an intricate interaction network between different species instead of structural anisotropy, can be an intrinsic driver of self-organization and lead to novel collective dynamics.

Vendredi 28 Novembre 2025, 14:15 à IPHT, Salle Claude Itzykson, Bât. 774	IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires)	physics
Paul Fendley	The uses of lattice non-invertible dualities and symmetries
Abstract:	I will describe a variety of applications of non-invertible symmetries and dualities. One use is to extend Kramers-Wannier duality to a large class of models, explaining exact degeneracies between non-(conventional) symmetry-related ground states as well as in the low-energy spectrum. For critical models, the universal behaviour under Dehn twists gives exact results for scaling dimensions, while gluing a topological defect to a boundary allows universal ratios of the boundary g-factor to be computed exactly on the lattice. Time permitting I will also describe analogous 2+1d models that provide good candidates for realising chiral topological order on the lattice.

Vendredi 28 Novembre 2025, 15:00 à LPTHE, LPTHE library	SEM-LPTHE (Séminaire du LPTHE)	hep-th
Kunal Gupta ( Uppsala )	From knots to quivers via exponential networks
Abstract:	I will present our proposal for a mirror derivation of the quiver description of open topological strings known as the knots-quivers correspondence, based on enumerative invariants of augmentation curves encoded by exponential networks. Quivers are obtained by studying M2 branes wrapping holomorphic disks with Lagrangian boundary conditions on an M5 brane, through their identification with a distinguished sector of BPS kinky vortices in the 3d-3d dual QFT. Our proposal suggests that holomorphic disks with Lagrangian boundary conditions are mirror to calibrated 1-chains on the associated augmentation curve, whose intersections encode the linking of boundaries. This is based on works arXiv:2407.08445, arXiv:2412.14901 with Pietro Longhi.

Lundi 1 Décembre 2025, 14:00 à LPNHE, Charpak	LPNHE (Séminaires du LPNHE)	physics
Constance Ganot ( IP2I )	Twins Embedding

Mardi 2 Décembre 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
Guido Giachetti ( ENS )	TBA

Mardi 2 Décembre 2025, 11:00 à DPT-PHYS-ENS, amphi Jaurès - 29 reu d'Ulm 75005 PARIS	COLLOQUIUM-ENS (Colloquium of the Physics Department of ENS)	physics
Hugo Duminil-Copin ( Université de Genève et IHES, lauréat de la médaille Fields 2022 )	Large-scale behaviour of the four-dimensional φ⁴ model
Abstract:	In this talk, we will discuss the scaling limits of spin fluctuations in four-dimensional Ising-type models with nearest-neighbor ferromagnetic interaction at or near the critical point are Gaussian and its implications from the point of view of Euclidean Field Theory.

Mardi 2 Décembre 2025, 11:00 à LPTHE, LPTHE library	SEM-LPTHE (Séminaire du LPTHE)	hep-th
Godwin Martin ( ICTS Bengaluru )	An Exterior Field Theory for Hawking Radiation
Abstract:	How should one understand the physics of field theories living around a black hole? We know since Einstein that black holes suck in everything that is thrown at them (dissipation into the black hole). But since Hawking, we also know that black holes radiate (Hawking fluctuations of the black hole). Can one set up a field-theoretic description in the exterior of a black hole accounting for both these effects? I will present an affirmative answer to this question (for an AdS Schwarzschild black brane) and try to explain how the black hole modifies the Feynman rules of the field theory outside.

Mardi 2 Décembre 2025, 11:00 à IPHT, Amphi Claude Bloch, Bât. 774	IPHT-GEN (Séminaire général du SPhT)
Jesse Thaler ( MIT )	TBA