Friday 14 February 2025, 11:00 at IPHT, Salle 35	STRINT (Strings, integrability and beyond)	hep-th
Bercel Bodis ( Wigner Research Centre for Physics )	Fredholm determinant in four-dimensional supersymmetric gauge theories
Abstract:	In holographic dualities, non-perturbative coefficients at large ’t Hooft coupling play an important role, as they encode different saddle point corrections for the string worldsheet. However, calculating these corrections from the string theory side turns out to be extremely difficult. In my talk, I present a systematic method to determine these corrections for a special class of observables in four-dimensional N=2 and N=4 supersymmetric Yang-Mills theories to arbitrary order. This method is based on the fact that, for arbitrary ’t Hooft coupling, these observables can be expressed in the form of a Fredholm determinant. From this representation, a large number of constraints can be derived in the form of differential and integral equations. These exact relations, together with certain analytical properties, completely determine the non-perturbative corrections of these observables. With this method, it is possible to effectively determine the entire transseries of several observables in four-dimensional supersymmetric gauge theories.

Friday 14 February 2025, 14:00 at IPHT, Salle Itzykson	STRINT (Strings, integrability and beyond)	hep-th
Alessandro Testa ( IPhT and Parma )	Solving N=2 superconformal long circular quiver theories by Tracy-Widom distributions
Abstract:	In this talk, I will discuss correlation functions of chiral primary half-BPS operators in four-dimensional N = 2 superconformal circular, cyclic symmetric quiver theories. Using supersymmetric localization, these functions can be expressed as matrix integrals which, in the planar limit, reduce to Fredholm determinants of certain semi-infinite matrices. This powerful representation allows us to investigate these correlators across the parameter space of the quiver theory, including both weak and strong coupling regimes and various limits of the number of nodes and the operator scaling dimensions. At strong coupling, the standard semiclassical AdS/CFT expansion diverges in the long quiver limit. However, by incorporating both perturbative corrections (in negative powers of the ’t Hooft coupling) and an infinite tower of nonperturbative, exponentially suppressed contributions, we derive a remarkably simple expression for the correlation functions in this limit. These functions exhibit exponential decay with increasing node separation and admit an interpretation within a five-dimensional effective theory. We determine the mass spectrum of excitations propagating along the emergent fifth dimension within this theory, finding it to be given by the zeros of Bessel functions.

Tuesday 18 February 2025, 10:30 at IHES, Amphithéâtre Léon Motchane ( Cours de l'IHES )	MATH-IHES (TBA)	math
Dustin Clausen ( IHES )	Algebraic K-theory and Chromatic Homotopy Theory (1/4)
Abstract:	The most universal kind of linear algebra is based not on abelian groups, but on homotopy-theoretic objects known as spectra. According to chromatic homotopy theory, one can systematically organize spectra into periodic families. On the other hand, a natural source of spectra is provided by algebraic K-theory, a highly refined cohomological invariant of rings (or schemes, etc). This leads to the subject of this course: the interaction of the chromatic theory with algebraic K-theory. The story begins with classical theorems of Thomason, Mitchell, and Hesselholt-Madsen. Bold generalizations of these theorems were conjectured by Rognes and Ausoni-Rognes, under the umbrella term of "redshift". Several of these conjectures are now theorems due to recent work of many people. Remarkably, this work has applications to "pure" chromatic homotopy theory: Burklund-Hahn-Levy-Schlank used it to settle (in the negative) the "telescope conjecture", the last of Ravenel's conjectures. Lecture 1: Introduction to chromatic homotopy theory. Lecture 2: Descent and "soft redshift". Lecture 3: "Hard redshift", a.k.a. the Lichtenbaum-Quillen property. Lecture 4: The telescope conjecture.

Tuesday 18 February 2025, 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 Bonnemain ( PhLAM, Lille )	Generalised Hydrodynamics of the KdV Soliton Gas
Abstract:	Generalised Hydrodynamics (GHD) is a rather recent theory that provides a framework for studying a wide family of many-body integrable and nearly integrable systems out of equilibrium. I will introduce the notion of soliton gas, associated with the Korteweg-de Vries (KdV) equation among others, and use it as a paradigmatic example for the GHD of integrable, classical field theories. In particular, by way of a heuristic argument based on the analogy between solitons and classical particles, I will construct the thermodynamics of the KdV soliton gas (free energy, entropy, static covariance...), as well as the Euler-scale hydrodynamic equations describing the evolution of weakly inhomogeneous gases. The results thus produced agree with numerical simulations; moreover they are consistent with and supplement the more rigorous, albeit less transparent, construction pioneered by Gennady El, based on the so-called thermodynamic spectral limit of finite-gap solutions

Tuesday 18 February 2025, 11:15 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
Simon Metayer	Precision field theory applied to statistical physics systems
Abstract:	I present an overview of my recent results in higher-order analytical computations of renormalization group observables in interacting field theories relevant to condensed matter many-body systems. Extending beyond leading-order approximations is often challenging but crucial. It enhances theoretical precision, provides benchmarks for less controlled methods, and, more interestingly, can unveil new physical phenomena. I will illustrate these points through concrete examples from my recent works. For clean polymerized membranes, cutting-edge four-loop calculation yield unprecedented precision for the anomalous elasticity exponent, thanks to surprisingly well-behaved epsilon expansions. These results benchmark precisely NPRG and SCSA methods and align closely with simulations and experiments on various membranes. Generalizing to the quenched disordered case, three-loop corrections reveal a previously unseen disorder-induced wrinkling transition towards a glassy phase fixed point, observed in partial polymerization experiments. In three-dimensional QED, higher-order large-N corrections refine the optical conductivity of graphene, while solving self-consistently the Schwinger-Dyson equations truncated beyond leading order sheds new light on fermion mass generation and interaction-driven metal-insulator transitions in graphene-like systems. In a minimal supersymmetric extension, higher-order large-N estimates predict the optical properties of "supergraphene" and uncover the previously unseen impact of supersymmetry in preventing dynamical symmetry breaking, making supergraphene a permanent conductor. These results demonstrate how precision calculations in field theory still remain a powerful framework for understanding and unveiling new emergent phenomena in complex statistical and quantum physics systems.

Wednesday 19 February 2025, 14:00 at IPHT, Salle Claude Itzykson, Bât. 774	IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires)	hep-th
Pieter Bomans ( University of Oxford )	Recent progress in non-conformal holography
Abstract:	In this talk, I will discuss recent results and ongoing progress in extending the holographic dictionary to non-conformal setups. I will begin by reviewing the case of maximally supersymmetric Yang-Mills (MSYM) theory in $d\neq 4$ dimensions and show how the full gravitational model can be analytically continued in dimension allowing us to access the BMN matrix quantum mechanics. In the second part of the talk, I will go beyond maximal supersymmetry and demonstrate how the techniques developed for MSYM can be systematically generalized. In particular, I will introduce the notion of scaling vacua and emphasize the role of scaling similarity in constructing non-conformal holographic duals.

Thursday 20 February 2025, 10:30 at IHES, Amphithéâtre Léon Motchane ( Cours de l'IHES )	MATH-IHES (TBA)	math
Dustin Clausen ( IHES )	Algebraic K-theory and Chromatic Homotopy Theory (2/4)
Abstract:	The most universal kind of linear algebra is based not on abelian groups, but on homotopy-theoretic objects known as spectra. According to chromatic homotopy theory, one can systematically organize spectra into periodic families. On the other hand, a natural source of spectra is provided by algebraic K-theory, a highly refined cohomological invariant of rings (or schemes, etc). This leads to the subject of this course: the interaction of the chromatic theory with algebraic K-theory. The story begins with classical theorems of Thomason, Mitchell, and Hesselholt-Madsen. Bold generalizations of these theorems were conjectured by Rognes and Ausoni-Rognes, under the umbrella term of "redshift". Several of these conjectures are now theorems due to recent work of many people. Remarkably, this work has applications to "pure" chromatic homotopy theory: Burklund-Hahn-Levy-Schlank used it to settle (in the negative) the "telescope conjecture", the last of Ravenel's conjectures. Lecture 1: Introduction to chromatic homotopy theory. Lecture 2: Descent and "soft redshift". Lecture 3: "Hard redshift", a.k.a. the Lichtenbaum-Quillen property. Lecture 4: The telescope conjecture.

Thursday 20 February 2025, 11:00 at IJCLAB, 210/114	IJCLAB-PTH (Particle Theory Seminar of IJCLAB Orsay)	hep-ph
Rafael Aoude ( University of Edinburgh )	Amplitudes for Hawking Radiation
Abstract:	In this talk, I will show a new approach to compute Hawking radiation based on on-shell scattering amplitudes. The Hawking spectrum is obtained by exponentiating a series of Feynman diagrams describing a massless scalar field scattering through a collapse background. Using semiclassical methods, we obtain a generalized an in-in generalisation of an amplitude closely connected to the Bogoliubov coefficients. Finally, I will show how subdominant one-loop correction can be interpreted as finite-size corrections sensitive to the radius of the black hole.

Thursday 20 February 2025, 11:00 at LPTHE, LPTHE library	SEM-LPTHE (Séminaire du LPTHE)	cond-mat.str-el
Clément Delcamp ( IHES )	TBA

Tuesday 25 February 2025, 10:30 at IHES, Amphithéâtre Léon Motchane ( Cours de l'IHES )	MATH-IHES (TBA)	math
Dustin Clausen ( IHES )	Algebraic K-theory and Chromatic Homotopy Theory (3/4)
Abstract:	The most universal kind of linear algebra is based not on abelian groups, but on homotopy-theoretic objects known as spectra. According to chromatic homotopy theory, one can systematically organize spectra into periodic families. On the other hand, a natural source of spectra is provided by algebraic K-theory, a highly refined cohomological invariant of rings (or schemes, etc). This leads to the subject of this course: the interaction of the chromatic theory with algebraic K-theory. The story begins with classical theorems of Thomason, Mitchell, and Hesselholt-Madsen. Bold generalizations of these theorems were conjectured by Rognes and Ausoni-Rognes, under the umbrella term of "redshift". Several of these conjectures are now theorems due to recent work of many people. Remarkably, this work has applications to "pure" chromatic homotopy theory: Burklund-Hahn-Levy-Schlank used it to settle (in the negative) the "telescope conjecture", the last of Ravenel's conjectures. Lecture 1: Introduction to chromatic homotopy theory. Lecture 2: Descent and "soft redshift". Lecture 3: "Hard redshift", a.k.a. the Lichtenbaum-Quillen property. Lecture 4: The telescope conjecture.

Tuesday 25 February 2025, 11:00 at IPHT, Salle Claude Itzykson, Bât. 774	IPHT-GEN (Séminaire général du SPhT)
Julio Parra-Martinez ( IHES )	Black-hole tides, running and matching
Abstract:	Tidal Love numbers quantify the finite-size properties of compact objects, such as absorption and their response to external fields. Perhaps surprisingly, even in classical general relativity, they undergo renormalization group running due to nonlinearities. In this talk I will explain some exact results about their running, which can be extracted using black-hole perturbation theory and point-particle effective theories (EFT). Due to the universality of the EFT, the results have applications to the physics of black holes, neutron stars, binaries and their signals in gravitational wave observatories. Our calculations can also provide the precise values of both static and dynamical Love numbers of black holes in various dimensions.

Wednesday 26 February 2025, 14:00 at IPHT, Salle Claude Itzykson, Bât. 774	IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires)	hep-th
Yixuan Li ( University of Padova )	TBA

Thursday 27 February 2025, 10:30 at IHES, Amphithéâtre Léon Motchane ( Cours de l'IHES )	MATH-IHES (TBA)	math
Dustin Clausen ( IHES )	Algebraic K-theory and Chromatic Homotopy Theory (4/4)
Abstract:	The most universal kind of linear algebra is based not on abelian groups, but on homotopy-theoretic objects known as spectra. According to chromatic homotopy theory, one can systematically organize spectra into periodic families. On the other hand, a natural source of spectra is provided by algebraic K-theory, a highly refined cohomological invariant of rings (or schemes, etc). This leads to the subject of this course: the interaction of the chromatic theory with algebraic K-theory. The story begins with classical theorems of Thomason, Mitchell, and Hesselholt-Madsen. Bold generalizations of these theorems were conjectured by Rognes and Ausoni-Rognes, under the umbrella term of "redshift". Several of these conjectures are now theorems due to recent work of many people. Remarkably, this work has applications to "pure" chromatic homotopy theory: Burklund-Hahn-Levy-Schlank used it to settle (in the negative) the "telescope conjecture", the last of Ravenel's conjectures. Lecture 1: Introduction to chromatic homotopy theory. Lecture 2: Descent and "soft redshift". Lecture 3: "Hard redshift", a.k.a. the Lichtenbaum-Quillen property. Lecture 4: The telescope conjecture.

Friday 28 February 2025, 11:00 at IJCLAB, 100/2-A201 - Salle A201 (IJCLab) ( https://indico.ijclab.in2p3.fr/event/11341/ )	IJCLAB-HEP (Particle Physics Seminars at IJCLab)	hep-ph|hep-th
Nodoka Yamanaka ( RIKEN )	Resolutions of the strong CP problem and the U(1) problem
Abstract:	We first show that the topological charge of nonabelian gauge theory is not observable. This immediately leads to the resolution of the Strong CP problem, and also to the irrelevance of the anomalous breaking of the axial U(1) symmetry [1,2]. We then present a mechanism which resolves the axial U(1) problem without chiral anomaly, i.e. consistent with the Nambu-Goldstone nature of eta and eta' mesons [3]. [1] N. Yamanaka, arXiv:2212.10994 [hep-th] [2] N. Yamanaka, arXiv:2212.11820 [hep-ph] [3] N. Yamanaka, arXiv:2411.02792 [hep-ph]

Wednesday 5 March 2025, 14:00 at IPHT, Salle Claude Itzykson, Bât. 774	IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires)	hep-th
Yiannis Tsiares ( IPhT Saclay )	TBA

Monday 10 March 2025, 14:00 at IHES, Amphithéâtre Léon Motchane ( Cours de l'IHES )	MATH-IHES (TBA)	math
Christophe Garban ( Université Lyon I )	The Berezinskii-Kosterlitz-Thouless (BKT) Phase and its Domain of Attraction (1/4)
Abstract:	One of the main goals of statistical physics is to study how spins displayed along the lattice Z^d interact together and fluctuate as the temperature changes. When the spins belong to a discrete set (which is the case for example in the celebrated Ising model, where spins σ_x take values in {-1,+1}) the nature of the phase transitions which arise as one varies the temperature is now rather well understood. When the spins belong instead to a continuous space (for example the unit circle S^1 for the so-called XY model, the unit sphere S^2 for the classical Heisenberg model etc.), the nature of the phase transitions differs drastically from the discrete symmetry setting. The case where the (continuous) symmetry is non-Abelian is even more mysterious (especially when d = 2) than the Abelian case. In the latter case, Berezinskii, Kosterlitz and Thouless have predicted in the 70's that these spins systems undergo a new type of phase transition in d = 2 -- now called the BKT phase transition -- which is caused by a change of behaviour of certain monodromies called "vortices". In this course, I will give an introduction to this intriguing BKT phase transition. Lecture 1. Introduction to the Berezinskii-Kosterlitz-Thouless (BKT) phase transition. Main examples which undergo a BKT phase transition (XY and Villain models on Z^2, Coulomb gas, clock models, integer-valued height functions). Physics explanations of the BKT transition and difference between S^1 and S^2. Lecture 2. Mathematical approach to BKT. Lecture 3. Domain of attraction of the BKT phase. Lecture 4. Non-linear sigma models and curvature.

Tuesday 11 March 2025, 14:00 at IHES, Amphithéâtre Léon Motchane ( Cours de l'IHES )	MATH-IHES (TBA)	math
Christophe Garban ( Université Lyon I )	The Berezinskii-Kosterlitz-Thouless (BKT) Phase and its Domain of Attraction (2/4)
Abstract:	One of the main goals of statistical physics is to study how spins displayed along the lattice Z^d interact together and fluctuate as the temperature changes. When the spins belong to a discrete set (which is the case for example in the celebrated Ising model, where spins σ_x take values in {-1,+1}) the nature of the phase transitions which arise as one varies the temperature is now rather well understood. When the spins belong instead to a continuous space (for example the unit circle S^1 for the so-called XY model, the unit sphere S^2 for the classical Heisenberg model etc.), the nature of the phase transitions differs drastically from the discrete symmetry setting. The case where the (continuous) symmetry is non-Abelian is even more mysterious (especially when d = 2) than the Abelian case. In the latter case, Berezinskii, Kosterlitz and Thouless have predicted in the 70's that these spins systems undergo a new type of phase transition in d = 2 -- now called the BKT phase transition -- which is caused by a change of behaviour of certain monodromies called "vortices". In this course, I will give an introduction to this intriguing BKT phase transition. Lecture 1. Introduction to the Berezinskii-Kosterlitz-Thouless (BKT) phase transition. Main examples which undergo a BKT phase transition (XY and Villain models on Z^2, Coulomb gas, clock models, integer-valued height functions). Physics explanations of the BKT transition and difference between S^1 and S^2. Lecture 2. Mathematical approach to BKT. Lecture 3. Domain of attraction of the BKT phase. Lecture 4. Non-linear sigma models and curvature.

Wednesday 12 March 2025, 13:30 at DPT-PHYS-ENS, salle ConfIV (Département de Physique de l'ENS - 24 rue Lhomond 75005 PARIS)	COLLOQUIUM-ENS (Colloquium of the Physics Department of ENS)	physics
Geoffrey Vallis	TBA
Abstract:	TBA

Wednesday 12 March 2025, 14:00 at IPHT, Salle Claude Itzykson, Bât. 774	IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires)	hep-th
Jiaxin Qiao ( EPFL Lausanne )	TBA

Thursday 13 March 2025, 11:00 at LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage	SEM-DARBOUX (Séminaire Darboux - physique théorique et mathématiques)	hep-th
Sofia Tarricone ( IMJ-PRG )	TBA

Monday 17 March 2025, 13:30 at LPENS, U209 (29 rue d'Ulm)	LPENS-MDQ (Séminaire Matériaux et Dispositifs Quantiques du LPENS)	cond-mat
Joseph Dufouleur ( Liebniz institute for solid state and materials research Dresden )	Dissipationless transport signature of topological nodal lines
Abstract:	Topological materials, such as topological insulators or semimetals, usually not only reveal the nontrivial properties of their electronic wavefunctions through the appearance of stable boundary modes, but also through very specific electromagnetic responses. The anisotropic longitudinal magnetoresistance of Weyl semimetals, for instance, carries the signature of the chiral anomaly of Weyl fermions. However, for topological nodal line (TNL) semimetals – materials where the valence and conduction bands cross each other on one-dimensional curves in the three-dimensional Brillouin zone – such a characteristic has been lacking. Here we report the discovery of a peculiar charge transport effect generated by TNLs: a dissipationless transverse signal in the presence of coplanar electric and magnetic fields, which originates from a Zeeman induced conversion of TNLs into Weyl nodes under infinitesimally small magnetic fields. We evidence this dissipationless topological response in trigonal PtBi2 persisting up to room temperature, and unveil the extensive TNLs in the band structure of this non-magnetic material [1,2]. These findings provide a new pathway to engineer Weyl nodes by arbitrary small magnetic fields and reveal that bulk topological nodal lines can exhibit non-dissipative transport properties.

Monday 17 March 2025, 14:00 at IHES, Amphithéâtre Léon Motchane ( Cours de l'IHES )	MATH-IHES (TBA)	math
Christophe Garban ( Université Lyon I )	The Berezinskii-Kosterlitz-Thouless (BKT) Phase and its Domain of Attraction (3/4)
Abstract:	One of the main goals of statistical physics is to study how spins displayed along the lattice Z^d interact together and fluctuate as the temperature changes. When the spins belong to a discrete set (which is the case for example in the celebrated Ising model, where spins σ_x take values in {-1,+1}) the nature of the phase transitions which arise as one varies the temperature is now rather well understood. When the spins belong instead to a continuous space (for example the unit circle S^1 for the so-called XY model, the unit sphere S^2 for the classical Heisenberg model etc.), the nature of the phase transitions differs drastically from the discrete symmetry setting. The case where the (continuous) symmetry is non-Abelian is even more mysterious (especially when d = 2) than the Abelian case. In the latter case, Berezinskii, Kosterlitz and Thouless have predicted in the 70's that these spins systems undergo a new type of phase transition in d = 2 -- now called the BKT phase transition -- which is caused by a change of behaviour of certain monodromies called "vortices". In this course, I will give an introduction to this intriguing BKT phase transition. Lecture 1. Introduction to the Berezinskii-Kosterlitz-Thouless (BKT) phase transition. Main examples which undergo a BKT phase transition (XY and Villain models on Z^2, Coulomb gas, clock models, integer-valued height functions). Physics explanations of the BKT transition and difference between S^1 and S^2. Lecture 2. Mathematical approach to BKT. Lecture 3. Domain of attraction of the BKT phase. Lecture 4. Non-linear sigma models and curvature.

Tuesday 18 March 2025, 14:00 at IHES, Amphithéâtre Léon Motchane ( Cours de l'IHES )	MATH-IHES (TBA)	math
Christophe Garban ( Université Lyon I )	The Berezinskii-Kosterlitz-Thouless (BKT) Phase and its Domain of Attraction (4/4)
Abstract:	One of the main goals of statistical physics is to study how spins displayed along the lattice Z^d interact together and fluctuate as the temperature changes. When the spins belong to a discrete set (which is the case for example in the celebrated Ising model, where spins σ_x take values in {-1,+1}) the nature of the phase transitions which arise as one varies the temperature is now rather well understood. When the spins belong instead to a continuous space (for example the unit circle S^1 for the so-called XY model, the unit sphere S^2 for the classical Heisenberg model etc.), the nature of the phase transitions differs drastically from the discrete symmetry setting. The case where the (continuous) symmetry is non-Abelian is even more mysterious (especially when d = 2) than the Abelian case. In the latter case, Berezinskii, Kosterlitz and Thouless have predicted in the 70's that these spins systems undergo a new type of phase transition in d = 2 -- now called the BKT phase transition -- which is caused by a change of behaviour of certain monodromies called "vortices". In this course, I will give an introduction to this intriguing BKT phase transition. Lecture 1. Introduction to the Berezinskii-Kosterlitz-Thouless (BKT) phase transition. Main examples which undergo a BKT phase transition (XY and Villain models on Z^2, Coulomb gas, clock models, integer-valued height functions). Physics explanations of the BKT transition and difference between S^1 and S^2. Lecture 2. Mathematical approach to BKT. Lecture 3. Domain of attraction of the BKT phase. Lecture 4. Non-linear sigma models and curvature.

Wednesday 19 March 2025, 12:45 at LPENS, 3 rue dUlm (College de France)	FORUM-ENS (Forum de Physique Statistique @ ENS)	cond-mat.stat-mech
Dalimil Mazac ( IPHT )	TBA

Wednesday 19 March 2025, 14:00 at IPHT, Salle Claude Itzykson, Bât. 774	IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires)	hep-th
Eric Perlmutter ( IPhT Saclay )	TBA

Friday 21 March 2025, 10:00 at IPHT, Salle Claude Itzykson, Bât. 774	COURS (Cours)	hep-th
Carlo Heissenberg ( IPhT (Institut de Physique Théorique du CEA de Saclay) )	Gravitational waves, scattering amplitudes and BMS
Abstract:	Gravitational waves, scattering amplitudes and BMS Carlo Heissenberg (IPhT) Scattering amplitudes offer a new strategy to calculate gravitational observables that reorganizes more traditional general relativity calculations in terms of gauge invariant, on-shell ingredients. The link between amplitudes and gravitational waves has led to several new results over the past few years and has stimulated a fruitful dialog with complementary approaches. Additional insight comes from universal constraints that govern the emission of low-frequency gravitational waves, soft theorems. The latter are closely related to the structure of infrared divergences, memory effects and symmetries that emerge at null infinity in asymptotically flat spacetimes. The aim of this lecture series is to provide an introduction to these topics and to illustrate some of the key connections that link them together. Topics: gravitational observables in the post-Minkowskian regime from scattering amplitudes eikonal phase and deflection angle in hyperbolic two-body encounters asymptotic symmetries of asymptotically flat spacetimes, BMS group memory effect and soft graviton theorem soft limit of the energy emission spectrum, static angular momentum loss gravitational waveforms beyond the soft limit radiated energy and angular momentum Course website: https://courses.ipht.fr/?q=en/node/323 Livestream on youtube.com/IPhT-TV: no subscription required Videoconference: subscribe to the course newsletter to receive links

Tuesday 25 March 2025, 11:00 at IPHT, Salle Claude Itzykson, Bât. 774	IPHT-GEN (Séminaire général du SPhT)
Per Berglund ( University of New Hampshire )	TBA

Wednesday 26 March 2025, 12:45 at LPENS, 3 rue dUlm College de France	FORUM-ENS (Forum de Physique Statistique @ ENS)	cond-mat.stat-mech
Félix Werner ( LKB )	TBA

Wednesday 26 March 2025, 14:00 at IPHT, Salle Claude Itzykson, Bât. 774	IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires)	hep-th
Markus Dierigl ( CERN )	TBA

Thursday 27 March 2025, 10:30 at IHES, Amphithéâtre Léon Motchane ( Cours de l'IHES )	MATH-IHES (TBA)	math
Misha Gromov ( IHES )	Mathematical Description of Biological Structures (1/4)
Abstract:	We shall try to assign mathematical meaning to the language used by biologists for describing basic structures and processes in living organisms, from the (sub)cellular level up to evolutionary dynamics of populations. In particular, we shall elucidate the mathematical as well as biological meaning of the following concepts. - biological (non-Shannon) information, - descriptional (non-Kolmogorov) complexity, - biological structure, - biological function (performed by a particular structure), - biological purpose (of a function), - information/program encoded and stored by a material structure (DNA, RNA), - information/signal transmitted by a matter/energy process/flow, - information/program, which controls such a "flow", - biological structures build by (networks of) matter/energy flows, e.g transcription --> translation --> protein folding. Also we indicate a potential use of formalisation of biological language in genetic engineering, e.g. in the analysis/applications of CRISPR and of phage assisted continuous evolution.