Friday 12 June 2026, 13:00 at LPENS, Conf IV	ENS-BIOPHYS (ENS Biophysics Seminar)	physics.bio-ph
Natanael Spisak ( Institut Imagine / INSERM )	Modeling helps identify the sources of human mutation
Abstract:	Mutations are the net result of DNA damage, repair and replication errors. Because cell types differ in their exposures, division rates and functions, their mutation patterns should differ too. Yet one mutational signature, SBS5, appears across all tissues and cell types, including post-mitotic neurons and the germline. Its cause is unknown. By modeling how mutations arise, we find that SBS5 reflects repair errors triggered by several types of damage. As predicted by the model, SBS5 rates increase with signatures of endogenous and exogenous damage and vary with damage and repair rates along the genome.

Friday 12 June 2026, 14:00 at LPTHE, library	LPTHE-PPH (Particle Physics at LPTHE)	hep-ph
Jonathan Ronca ( University of Padova )	Evaluating Feynman integrals: modern techniques and tools
Abstract:	In this talk, I will review both theoretical and phenomenological aspects of multi-loop scattering amplitudes, emphasizing their broad range of applications in modern particle physics. Recent advances in the mathematical understanding of Feynman integrals have had a significant impact across several areas of theoretical physics, ranging from precision predictions in perturbative quantum field theory to applications in cosmology and classical gravity. I will discuss some of the state-of-the-art techniques currently employed for the evaluation of Feynman integrals, illustrating how these objects naturally connect diverse fields such as differential geometry, differential equations, and numerical techniques. Parallel to this discussion, I will provide examples of multi-loop calculations and present novel automated tools devoted to scattering amplitude evaluations.

Monday 15 June 2026, 11:00 at IPHT, Salle Claude Itzykson, Bât. 774	IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires)	physics
Sylvain Ribault	Conformal correlators with abelian monodromies
Abstract:	Résumé: In critical limits of statistical models, non-local observables such as cluster connectivities can be conformally invariant without necessarily belonging to a conformal field theory. We propose to describe such observables in terms of conformal correlator systems, defined by weaker axioms than those of CFT. In particular, N-point functions can be reduced to 4-point functions, instead of 3-point functions in CFT. In two dimensions, the spectrum of a conformal correlator system is not constrained by modular invariance. This allows the spin to take arbitrary complex values, leading to correlators with nontrivial monodromies. We show that sphere 4-point functions and torus 1-point functions are subject to nontrivial monodromy constraints. We give examples of correlators with abelian monodromies: explicit examples from free fields, and more complicated examples from critical loop models.

Monday 15 June 2026, 14:00 at CPHT, Salle de Conférence Jean Lascoux	SEM-CPHT (Séminaire du CPHT)	hep-th
Rajeev Erramilli ( IHES )	The Numerical Bootstrap at the Extremes: 3D Ising, CFT Cartography, and Upgrading Extremal Flows
Abstract:	In the first half of the talk, aimed at an audience including bootstrap non-experts, I will present results from the current state of the art of the numerical conformal bootstrap: bootstrapping the stress tensor, both for the 3D Ising CFT in particular and in the space of all local, unitary 3D CFTs in general. Beyond the headline result for the Ising CFT — the most precise determinations of the leading scaling dimensions and OPE coefficients yet — I will present some preliminary results in analyzing the extremal functional spectrum for the Ising CFT. As for the space of all local, unitary 3D CFTs, I will present bounds which present nontrivial and puzzling features which motivate a proposed program of “CFT Cartography.” This half will be based on arXiv:2411.15300, arXiv:2602.13383, and ongoing work. In the second half of the talk, aimed at an audience of bootstrap experts, I will move on to discussing an alternative approach to numerically finding and studying extrema solutions of bootstrap constraints, namely the method of extremal flows. I will present the development and adaptation of that approach to a more general class of flows with apparent discontinuities. I focus on upgrading solutions of gap maximization for the spinning modular bootstrap from low to high numerical order, though the methodology is generic to a broader class of bootstrap constraints and flows. This methodology presents various nontrivialities and nuances which reflect a richness of the space of bootstrap solutions. The result is a prototype which successfully upgrades solutions in a simple test case at small scale. This half will be based on arXiv:2604.24839.

Tuesday 16 June 2026, 11:30 at LPTHE, LPTHE library	SEM-LPTHE (Séminaire du LPTHE)	hep-th
Kaustubh Singhi ( ICTS )	Complex Black Holes and Thermodynamics
Abstract:	It has been known for some time now that black holes admit a thermodynamic description. A Euclidean path integral approach due to Gibbons and Hawking also allows for a statistical description of black hole thermodynamics. We will revisit this for black holes in AdS spacetime and derive "well established" results in the literature. In the process, we will encounter certain subtleties in the calculation that have not been given much attention in the past, but can modify our understanding. These subtleties have to do with complex saddles of the path integral. We'll show that there is a possibility that these saddles, if relevant, can mess up our basic expectations of low temperature CFT physics. We will use some modern tools from analysis to show that this does not happen, thus bridging certain gaps in the literature.

Tuesday 16 June 2026, 11:30 at IHES, Centre de conférences Marilyn et James Simons ( Séminaire Laurent Schwartz EDP et applications )	MATH-IHES (TBA)	math
Chengyang Shao ( IHES )	Paradifferential Operators on the Sphere and Oscillation of Capillary Droplet

Tuesday 16 June 2026, 13:30 at IHES, Centre de conférences Marilyn et James Simons ( Séminaire Laurent Schwartz - EDP et applications )	MATH-IHES (TBA)	math
Carlos Kenig ( University of Chicago )	Interior and Boundary Unique Continuation

Tuesday 16 June 2026, 15:00 at IHES, Centre de conférences Marilyn et James Simons ( Séminaire Laurent Schwartz - EDP et applications )	MATH-IHES (TBA)	math
Alexis Vasseur ( University of Texas, Austin )	Boundary Vorticity Estimate for Navier-Stokes and Control of Layer Separation at the Inviscid Limit

Wednesday 17 June 2026, 11:00 at LPENS, Conf IV ( Room to be confirmed: either Conf IV or E239 )	FORUM-ENS (Forum de Physique Statistique @ ENS)	cond-mat.stat-mech
Victor Godet ( LPTHE )	Inflation and topology from the no-boundary state
Abstract:	The no-boundary wavefunction for slow-roll inflation on the 3-sphere exponentially favors a small universe, in sharp disagreement with observations. I will explain how this problem is resolved by changing the spatial topology to the 3-torus. The sum over geometries, computed using the theory of automorphic forms for GL(3), produces a wavefunction favoring a large inflating universe with N>250 e-folds.

Wednesday 17 June 2026, 14:00 at IJCLAB, 210/1-114 - Salle des Séminaires (IJCLab)	IJCLAB-COSM (Seminar of the Gravity and cosmology group of IJCLAB)	gr-qc
Quentin Vigneron	Modifying general relativity as function of the topology of the universe: motivations and consequences
Abstract:	I will present a modification of general relativity in which a non-dynamical term depending on the topology of the Universe is added in the Einstein equation. The presentation will be an overview of the motivations and consequences for cosmology of this framework. In particular I will show how the theory allows for the construction of a simple inflationary model for curved backgrounds, something not possible in general relativity.

Wednesday 17 June 2026, 14:00 at CDF, Amphithéâtre Guillaume Budé (site Marcelin-Berthelot) ( 6e leçon )	COURS (Cours)	hep-th
Marc Henneaux ( Collège de France )	Limites non relativistes de la th\'eorie d'Einstein et applications
Abstract:	Limites non relativistes des th\'eories des champs

Wednesday 17 June 2026, 14:30 at IHES, Amphithéâtre Léon Motchane	MATH-IHES (TBA)	math
Leonid Chekhov ( Michigan State University & IHES )	Volumes of Moduli Spaces of Bordered Surfaces and Schwarzians
Abstract:	We consider ``fool's crowns'' -- parts of Riemann surfaces with holes with n marked points/bordered cusps on a hole boundary decorated by horocycles. We define volumes of the corresponding moduli spaces by postulating a decoration-independent action, which in the limit of n tending to infinity transforms into a Schwarzian action on boundary "trumpets". We derive the corresponding volumes for arbitrary n and coupling constant kappa and describe the statistical model obtained in terms of Brownian bridges. This is a joint work with Timothy Budd (Nijmegen Univ.)

Wednesday 17 June 2026, 16:00 at CDF, Amphithéâtre Guillaume Budé (site Marcelin-Berthelot)	SEM-EXCEP (Seminaire exceptionnel)	hep-th
Adrien Fiorucci ( Ecole Polytechnique )	Gravitational Flux-Balance Laws from Conformal Carroll Geometry
Abstract:	The main challenges in formulating a holographic correspondence for asymptotically flat spacetimes stem from the null character of the conformal boundary and from the fact that gravitational charges are not conserved in the presence of radiative flux. In this talk, I will present a systematic and mathematically robust derivation of the associated flux-balance laws for mass and angular momentum from geometric principles formulated intrinsically at null infinity. I will begin with a pedagogical review of the key aspects of the geometry at null infinity, which can be described in terms of conformal Carroll geometry. I will highlight that the boundary affine connection, which is the manifestation of the gravitational field at the boundary, contain degrees of freedom that naturally act as sources encoding gravitational radiation in a holographic framework. I will then show how to derive flux-balance laws for an effective field theory intrinsically formulated at the boundary, using novel techniques in which ``hypermomenta" arise as the response to fluctuations of the boundary connection. These equations reproduce the celebrated Bondi-van der Burg-Metzner-Sachs flux-balance laws in a convenient boundary gauge. Based on: A. Fiorucci, S. Pekar, P. M. Petropoulos and M. Vilatte, Carrollian-Holographic Derivation of Gravitational Flux-Balance Laws, Phys.Rev.Lett. 135(2025) 26, 261602, [hep-th/2505.00077] (based on 2505.00077 )

Thursday 18 June 2026, 10:00 at IHP, Pierre Grisvard	RENC-THEO (Rencontres Théoriciennes)	hep-th
Leonardo Rastelli	TBA

Thursday 18 June 2026, 11:00 at IHES, Amphithéâtre Léon Motchane ( Séminaire de Géométrie arithmétique )	MATH-IHES (TBA)	math
Atsushi Shiho ( The University of Tokyo )	On Hodge-Witt Sheaves with Modulus
Abstract:	Let k be a perfect field of characteristic p > 0. The Hodge-Witt sheaf is a sheaf with transfer on the category of smooth k-varieties. However, since it does not satisfy the cohomological A1-invariance, the Hodge-Witt cohomology is not representable in Voevodsky's category of motives. One way to overcome this drawback is to consider the category of motives with modulus defined by Kahn-Miyazaki-Saito-Yamazaki. We define the Hodge-Witt sheaf for modulus pairs over k satisfying the properties called the cohomological cube invariance and the cohomological blow-up invariance. These imply that the Hodge-Witt cohomology is representable in the category of motives with modulus under resolution of singularities. Also, we try to discuss properties of our Hodge-Witt sheaves for modulus pairs and possible relationship with another construction by Ren-Rulling. This is partly joint work in progress with Veronika Ertl.

Thursday 18 June 2026, 14:00 at 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
Luca Giacomelli ( MPQ, Univ. Paris Cité )	A Josephson junction in a multimode environment: emergent quantum phase transition and exact low-energy duality
Abstract:	The physics of a single Josephson junction coupled to a resistive environment is a long-standing fundamental problem at the center of an intense debate about the existence and properties of the superconducting-to-insulating Schmid-Bulgadaev transition. To circumvent the potential subtleties in the original derivation, we investigate the emergent criticality of a junction coupled to a multimode resonator when the number of modes is increased [1]. By solving the system via exact diagonalization, we show that at the transition point the spectrum displays universality (scale invariance) not only at low frequencies. This reflects in finite-frequency spectral signatures of the phase transition, in agreement with recent experiments. The spectrum at the critical point is successfully compared with analytical and numerical results obtained in the past [2]. Finally, we prove a low-energy exact self-duality of the model, that emerges from two different finite-size circuits with different conserved quantities [3]. This confirms and generalizes the approximate self duality that is usually invoked, and proves the independence of the transition point on the ratio of Josephson to charging energy. [1] Giacomelli L., Ciuti C., Nature Communications, 15(1), 5455 (2024) [2] Paris, Giacomelli, Daviet, Ciuti, Dupuis, Mora, Phys. Rev. B, 111(6), 064509 (2025) [3] Giacomelli L., Devoret M. H., Ciuti C., Phys. Rev. Lett., 136(13), 130401 (2026)

Friday 19 June 2026, 10:00 at IPHT, Salle Claude Itzykson, Bât. 774	IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires)	physics
Thibaut Arnoulx De Pirey ( IPhT )	Statistical Physics of Ecosystems 5/5
Abstract:	Abstract:  There is an intriguing robustness in certain statistical patterns describing the dynamics and organization of seemingly very different ecosystems, spanning scales from trees in a rainforest to bacteria in the human gut. These patterns motivate several common questions: How can so many ecologically similar species coexist locally? Why does only a small fraction of these coexisting species typically account for most of the total biomass? What drives changes in the identity of these dominant species across space and time? In this lecture, I will give an account of recent work at the intersection of statistical physics and theoretical ecology that aims to address these questions. Emphasis will be placed on disordered-systems approaches, which provide a natural theoretical framework without committing to any specific ecosystem. Topics covered include: Common patterns in the organization and dynamics of species-rich ecosystems Disordered Lotka-Volterra-like models and Dynamical Mean-Field Theory Models for the coexistence of spatially extended populations Inverse stability-complexity relationship in the presence of environmental disorder Please check the IPhT courses website courses.ipht.fr for last-minute changes in the schedule.To receive the latest news on this course and the video-conference links, please subscribe to its newsletter, as explained at the courses website.An open, non-interactive livestream will also be available at youtube.com/ipht-tv

Friday 19 June 2026, 11:00 at LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage	SEM-LPTHE (Séminaire du LPTHE)	hep-th
Sameer Murthy ( King's College )	The giant graviton expansion in AdS5 x S5
Abstract:	The superconformal index of N=4 U(N) super Yang-Mills theory has a q-series expression with successive terms suppressed by q^N, called the Giant Graviton Expansion (GGE). I will give some physical and mathematical context to the GGE, and then discuss the derivation of the GGE in the holographic dual AdS5×S5. In particular, I will discuss the quantization of the 1/2-BPS giants in the bulk in the functional integral formalism. I will show how the corresponding integral localizes to collections of maximal giants, i.e. D-branes wrapping a maximal 3- sphere inside the 5-sphere. Interestingly, the small fluctuations of the maximal giants are a described by a supersymmetric version of the Landau problem. I will show how they precisely reproduce the successive terms of the GGE.

Monday 22 June 2026, 14:00 at CPHT, Salle de Conférence Louis Michel	SEM-CPHT (Séminaire du CPHT)	hep-th
Paul Balduf ( University of Oxford )	Tropical field theory and the renormalization group
Abstract:	Tropical field theory is a recently developed approximation scheme for Feynman integrals. The original definition was combinatorial, and based on the Schwinger-parametric representation of Feynman integrals, but there is an equivalent perspective based on analytic continuation of long-range field theory. Summing over all diagrams, the tropical amplitudes at zero momentum transfer satisfy a partial differential equation, the tropical loop equation. Tropical field theory is multiplicatively renormalizable, and contains all the Feynman diagrams of ordinary scalar theories, which makes it an excellent model for renormalization of Feynman integrals including all topologies of vertex subdivergences. The renormalized tropical amplitudes satisfy a partial differential equation that coincides with the local potential approximation of the functional renormalization group, giving yet another physical interpretation: Tropical field theory is the Feynman-diagram expansion of the local potential approximation. Based on recent joint work with Erik Panzer, https://arxiv.org/abs/2512.21091

Tuesday 23 June 2026, 11:00 at IPHT, Amphi Claude Bloch, Bât. 774	IPHT-GEN (Séminaire général du SPhT)
Christophe Royon ( University of Kansas )	From the structure of the proton and heavy ions to the search for axion-like particles at the Large Hadron Collider
Abstract:	After describing elastic interactions and the discovery of the odderon by the TOTEM and D0 Collaborations, we will discuss new kinematical regimes where the gluon density in the proton or Pb can be very large which leads to new equations in Quantum Chromodynamics.  We will also present the latest expectations on beyond standard model physics and especially the production of axion-like particles using intact protons after the collision.  We will finish by describing briefly the Low Gain Avalanche Detectors and their applications in medicine for cancer treatment and with NASA to measure cosmic rays.

Tuesday 23 June 2026, 14:00 at LPTHE, library	LPTHE-PPH (Particle Physics at LPTHE)	hep-ph
Andrea Simonelli ( INFN Rome )	Probing QCD in the Deep Infrared through the Phenomenology of Hadronic Processes
Abstract:	Extracting information on fundamental QCD operators from hadronic cross sections is challenging, mainly due to the important role of non-perturbative effects at low energy scales. With the increasing precision of upcoming measurements, it becomes essential to establish a clearer connection between formal factorization and phenomenological approaches. In this seminar, I will discuss the phenomenology of transverse-momentum-dependent (TMD) parton distributions, and present a novel framework based on analytic resummation. This approach relates the non-perturbative structure of TMDs to fundamental QCD properties, such as the infrared behavior of the strong coupling and collinear parton distributions. I will also show how processes that are seemingly unrelated share common underlying universal features. Making these connections explicit opens the possibility of unifying different frameworks, ultimately enhancing the predictive power for precision QCD observables.

Thursday 25 June 2026, 14:00 at ESPCI, Room Charpak, entrance building, ground floor, 10 rue Vauquelin, Paris ( Please contact seminaires-lpem@espci.fr for the zoom link )	SEM-EXCEP (Seminaire exceptionnel)	cond-mat
Antoine Kahn ( Department of Electrical and Computer Engineering, Princeton Univ. )	Quantum Cutting in Ytterbium-Doped Solution-Processed Metal Halide Perovskites Films
Abstract:	see attached file.
Attachments:	ESPCIJune2026.pdf (103451 bytes)

Thursday 25 June 2026, 14:00 at ESPCI, Room Charpak, entrance building, ground floor, 10 rue Vauquelin, Paris ( Please contact seminaires-lpem@espci.fr for the zoom link )	SEM-EXCEP (Seminaire exceptionnel)	cond-mat
Maria Carolina O. Aguiar ( Universidade Federal de Minas Gerais, Belo Horizonte, Brazil )	TBA

Friday 26 June 2026, 13:00 at LPENS, Conf IV	ENS-BIOPHYS (ENS Biophysics Seminar)	physics.bio-ph
Vittore Scolari ( Institut Curie )	TBA

Monday 29 June 2026, 14:00 at IPHT, Salle Claude Itzykson, Bât. 774	IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires)	physics
Nicholas Sedlmayr	TBA

Tuesday 30 June 2026, 14:00 at 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
Pedro Ribeiro ( Universidade de Lisboa )	Dissipative Quantum Chaos — from Theory to the Lab
Abstract:	Dissipative quantum chaos is an emerging field that investigates how chaotic behavior arises in quantum systems coupled to their environments. Understanding the dynamics of such open quantum systems is crucial, particularly for describing quantum matter in realistic scenarios where environmental interactions cannot be neglected. In this talk, I will outline recent theoretical advances in characterizing universal features of dissipative quantum systems using non-Hermitian random matrix theory. Key spectral signatures of dissipative chaos, such as complex spacing ratios (CSRs), universal ring-to-disk transitions, and a systematic symmetry-based classification of many-body superoperators under antiunitary involutions, will be discussed. Turning from theory to practice, I will present our recent experimental achievements demonstrating dissipative quantum chaos and integrability transitions. These results were obtained by measuring CSRs in the superoperator spectra of open many-body quantum systems implemented on a state-of-the-art superconducting quantum processor, providing the first direct laboratory observation of these theoretical predictions.

Tuesday 8 September 2026, 10:45 at 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 Bertrand ( Imperial College London )	TBA