Wednesday 24 April 2024, 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
Alessio Lerose ( University of Oxford )	Synthetic quantum matter out of equilibrium: A few recent advances from theory to simulation
Abstract:	"Synthetic matter" has emerged as a new paradigm of quantum many-body physics, characterized by unprecedented degree of spatiotemporal control and programmability of Hamiltonian interactions. If on the one hand these experimental developments bring us closer to Feynman's vision of a universal quantum simulator for challenging open questions in many-body physics, on the other hand new fundamental theory questions on the behavior of quantum matter far from thermal equilibrium become accessible. Thermalization dynamics of isolated quantum systems and non-thermal states of matter are now at the center of multiple research efforts in theoretical physics. In this talk I will describe recent advances in understanding the mechanism of thermalization as well as long-lived non-equilibrium states of matter. Specifically, I will introduce an influence-functional approach to quantum many-body dynamics and describe preliminary evidence that it helps classifying non-equilibrium universal behavior. Furthermore, I will discuss the synthetic-matter version of the celebrated Coleman's false-vacuum decay scenario, and show that unique dynamical features appear, including emergent quasi-many-body-localized dynamics of interfaces and metastable long-range order. In parallel, I will describe how such theoretical advances led to unforeseen developments in applications, from a numerical method for strongly correlated electrons to a strategy for quantum simulation of real-time phenomena in lattice gauge theories.

Wednesday 24 April 2024, 13:30 at DPT-PHYS-ENS, ConfIV (E244) - Dépt de Physique de l'ENS - 24 rue Lhomond 75005 PARIS	COLLOQUIUM-ENS (Colloquium of the Physics Department of ENS)	physics
Kallia Petraki	Complicated dark matters
Abstract:	Most of the matter in our universe consists of some yet unknown particle species whose existence we have inferred only gravitationally. This so-called dark matter is responsible for the evolution and structure of the universe as we observe it. It also signifies the existence of unknown fundamental physics that could potentially be connected to other deep questions. Decades of research on dark matter have seen both our theories and experimental probes evolve to resolve this important and complex problem.

Thursday 25 April 2024, 10:00 at IHP, Grisvard (314)	RENC-THEO (Rencontres Théoriciennes)	hep-th
Francesco Russo ( Pisa University )	Bounding Effective Field Theories by bootstrap methods
Abstract:	We show how to use general assumptions of the unknown UV theory to constrain the IR physics. Specifically, we can consider causality and unitarity of the S-matrix to set up a bootstrap problem. By solving it with numerical optimisation methods, we obtain the allowed EFT coefficients which are consistent with a unitary and causal UV completion. We focus on the scattering of photons in four dimensions with and without gravity. Finally, we present a method to compute all partial waves for spinning particles in arbitrary dimensions.

Thursday 25 April 2024, 11:45 at IHP, 314	RENC-THEO (Rencontres Théoriciennes)	hep-th
Lisa Randall ( Harvard )	Cool But Not (necessarily) Supercool: RS/Holographic Phase Transition
Abstract:	It is generally accepted that the confining phase transition in RS is first order, and is likely to be very suppressed. In this talk I demonstrate that the conclusion is model-dependent. Even simple variations weaken the strength of the transition and possibly even destroy the first order nature altogether.

Thursday 25 April 2024, 14:00 at IJCLAB, 100/2-A201 - Salle A201 (IJCLab)	IJCLAB-HEP (Particle Physics Seminars at IJCLab)	hep-ph|hep-th
Silvia Ferrario Ravasio ( CERN )	Formal and practical accuracy in Parton Showers
Abstract:	Parton shower event generators are fundamental tools for establishing the quantitative connection between theory and experiment. However, their flexibility comes at the expense of lower formal accuracy compared to state-of-the-art analytic calculations, which, in turn, have more limited applicability. The poor accuracy of commonly used parton shower generators introduce systematic uncertainties that impact all measurements in collider experiments. In this talk, I will discuss the efforts made by the PanScales collaboration to augment the formal accuracy of parton showers. Until recently, this accuracy was limited to the leading logarithms. Specifically, I will demonstrate how we can achieve Next-to-Leading Logarithm (NLL) accuracy for processes involving two partons, such as color-singlet production, decay, and deep inelastic scattering. Furthermore, I will present advancements beyond NLL for observables primarily sensitive to soft emissions, such as particle multiplicity and jet vetoes. These developments are crucial for refining our understanding of fundamental particle interactions. They also play a vital role in reducing uncertainties in present and future collider measurements.

Thursday 25 April 2024, 16:15 at CDF, Salle 2	IPH COLLOQUIUM (Colloquium of the physics institute of Collège de France)	quant-ph
Immanuel Bloch ( Max Planck Institute of Quantum Optics and LMU Munich, Germany )	New Frontiers for Quantum Simulation with Atom and Molecules
Abstract:	Quantum simulation has enabled engineering and probing quantum matter in new parameter regimes and with compelling novel probes. Individual snapshots can reveal the position and spin of each atom in the system thereby providing access to complex correlations in materials that are often crucial to understand their behaviour. In my talk, I will discuss recent progress on quantum simulation with ultracold atoms and molecules in optical lattices and tweezers. The physics of strongly correlated electronic materials can e.g. be efficiently realized using ultracold fermionic atoms. Tuneable lattice geometries allow one to introduce programmable geometries and mixed dimensional situations in which doping can be continuously tuned. I will show how pairing of charge carriers and extended stripe-like structures emerge under such conditions due to an interplay of mobile dopant, mixed dimensions, and an antiferromagnetic background. Polar molecules provide an alternative platform for realizing long-range interacting itinerant systems but have for a long time been plagued by uncontrolled losses. I will delineate how such losses can be overcome using microwave radiation and give rise to novel field-linked scattering resonances that allow assembling larger ultracold molecular complexes also opening the route to p-wave superfluids. Finally, I will discuss how merging the techniques of optical lattices and optical tweezers provides for a powerful platform for quantum simulation and computing that has enabled the continued operation of large arrays of atoms over time.

Friday 26 April 2024, 11:00 at IHES, Amphithéâtre Léon Motchane	MATH-IHES (TBA)	math
David Solomon ( University College London & IHES )	SICs, Heisenberg Groups and Stark’s Conjectures Part II: A p-Adic Approach for Real-Quadratic Fields
Abstract:	In my previous talk, on 9/4/24, I set Stark's Conjectures in the more general context of Hilbert's 12th Problem, highlighting the special complex functions used by number-theorists to study various cases in recent decades. I also surveyed the remarkable way that the same special functions have cropped up recently in Quantum and Statistical Physics, as indeed have SICs themselves in the case of the first order Stark Conjecture over real quadratic fields. In this second, more number-theoretic, talk I will focus on the latter case. After recalling the necessary details, I will motivate and explain some ongoing work which sets SICs in the context of the Heisenberg group over Z_p (the p-adic integers), `Theta-pairings' of p-adic measures and Coleman's power series. This in turn motivates the search for `special measures' to replace the complex functions mentioned above, in a possible p-adic theory of real-multiplication. Although this will necessarily be a more technical talk than the previous one, I shall still aim to make it largely accessible to non-number-theorists.

Friday 26 April 2024, 14:00 at LPTHE, Library	LPTHE-PPH (Particle Physics at LPTHE)	hep-ph
Alessandro Dondarini ( Pisa University )	The NANOGrav Bound On Ultralight Dark Matter
Abstract:	The detection of the stochastic gravitational wave background by NANOGrav imposes constraints on the mass of compact cores of ultralight dark matter, also known as ``solitons'', surrounding supermassive black holes found at the centers of large galaxies. The strong dynamical friction between the rotating black holes and the solitons competes with gravitational wave emission, resulting in a suppression of the characteristic strain in the nHz frequency range. Our findings rule out solitons arising from the condensation of ultralight dark matter particles with masses ranging from $1.3 \times 10^{-21}$ eV to $1.4 \times 10^{-20}$ eV.

Monday 29 April 2024, 14:00 at LPTHE, library & Zoom link in comments ( The Zoom link is: https://u-paris.zoom.us/j/86313706621?pwd=Zk9lR0cxSjRWS0xHK1ZZbUJING5nZz09 )	LPTHE-PPH (Particle Physics at LPTHE)	hep-ph
Giovanni Stagnitto ( Università Milano Bicocca )	Semi-inclusive deep-inelastic scattering at NNLO in QCD
Abstract:	Semi-inclusive hadron production processes in deep-inelastic lepton-nucleon scattering (SIDIS) are important probes of the fragmentation dynamics of quarks into hadrons. Moreover, longitudinally polarized SIDIS is a powerful tool for resolving the quark flavor decomposition of the proton's spin structure. In this talk, I will present the recent calculation of the full next-to-next-to-leading order (NNLO) QCD corrections to the unpolarized and longitudinally polarized SIDIS coefficient functions. I will comment on the numerical impact of these corrections in different kinematical regions and on the usage of these predictions in the context of global fits of parton distribution functions and fragmentation functions.

Tuesday 30 April 2024, 11:00 at LPTMS, Online seminar ( Zoom information: Meeting ID: 962 7757 4790 Passcode: 844783 )	LPTMS (Séminaire du Laboratoire de Physique Théorique et Modèles Statistiques (Orsay))	cond-mat.stat-mech
Berislav Buca ( Niels Bohr Institute )	Eigenoperator thermalization
Abstract:	I will provide a framework for computing time-averaged dynamics in locally interacting systems in any dimension. It is based on pseudolocal dynamical symmetries generalising pseudolocal charges and unifies seemingly disparate manifestations of quantum non-ergodic dynamics including quantum many-body scars, continuous, discrete and dissipative time crystals, Hilbert space fragmentation, lattice gauge theories, and disorder-free localization. Using the theory two novel types of phase transitions are introduced: 1) The « scarring phase transition » where the order parameter is the locality of the projected local quantities – for certain initial states persistent oscillations are present. 2) The « fragmentation phase transition » for which long-range order is established in an entire phase due to presence of certain non-local strings. Two prototypical, but otherwise mostly intractable, models are solved using the theory: 1) a spin 1 scarred model and 2) the t-J_z model with fragmentation. References: Berislav Buca. Unified theory of local quantum many-body dynamics: Eigenoperator thermalization theorems. Phys. Rev. X 13, 031013 (2023). Benjamin Doyon. Thermalization and pseudolocality in extended quantum systems. Commun. Math. Phys. 351: 155- 200 (2017).

Tuesday 30 April 2024, 14:00 at IHES, Amphithéâtre Léon Motchane ( Cours de l'IHES )	PT-IHES (Séminaire de physique théorique de l'IHES)	hep-th
Clement Delcamp ( IHES )	Topological Symmetry and Duality in Quantum Lattice Models (3/4)
Abstract:	A modern perspective on symmetry in quantum theories identifies the topological invariance of a symmetry operator within correlation functions as its defining property. In addition to suggesting generalised notions of symmetry, this viewpoint enables a calculus of topological defects, which has a strong category-theoretic flavour, that leverages well-established methods from topological quantum field theory. Focusing on finite symmetries, I will delve during these lectures into a realisation of this program in the context of one-dimensional quantum lattice models. Concretely, I will present a framework for systematically investigating lattice Hamiltonians, elucidating their symmetry operators, defining duality/gauging transformations and computing the mapping of topological sectors through such transformations. Moreover, I will comment on the classification of gapped symmetric phases for generalised symmetry and the construction of the corresponding order/disorder parameters. I will provide explicit treatments of familiar physical systems from condensed matter theory, shedding light on celebrated results and offering resolutions to certain open problems. Time permitting, I will briefly touch upon generalisations to higher dimensions and implications to numerical simulations.

Tuesday 30 April 2024, 14:00 at LPTHE, Library	LPTHE-PPH (Particle Physics at LPTHE)	hep-ph
Iason Baldes ( LPENS )	Supercooled phase transitions and baryogenesis
Abstract:	I will present a baryogenesis mechanism in which the asymmetry is sourced from heavy particles which either gain their mass or are created during bubble expansion in a strong first order phase transition. These particles then decay in a CP and baryon number violating way inside the bubble. I will discuss the key differences with the well studied electroweak baryogenesis scenario. I will also discuss the scenario within the context of recent progress in particle, primordial black hole, and gravitational wave production during supercooled phase transitions.

Thursday 2 May 2024, 14:00 at LPTMC, LPTMC seminar room, Jussieu, towers 12-13, 5th floor, room 523	SEM-EXCEP (Seminaire exceptionnel)	cond-mat
Dganit Meidan ( BGU )	Theory of free fermion dynamics – from monitored to post selected evolution
Abstract:	Monitored quantum systems undergo Measurement-induced Phase Transitions (MiPTs) stemming from the interplay between measurements and unitary dynamics. When the detector readout is post- selected to match a given value, the dynamics is generated by a Non-Hermitian Hamiltonian with MiPTs characterized by different universal features. Here, we derive a partial post-selected stochastic Schrodinger equation based on a microscopic description of continuous weak measurement. This formalism connects the monitored and post-selected dynamics to a broader family of stochastic evolution. We apply the formalism to a chain of free fermions subject to partial post-selected monitoring of local fermion parities. Within a 2-replica approach, we obtained an effective bosonized Hamiltonian in the strong post-selected limit. Using a renormalization group analysis, we find that the universality of the non-Hermitian MiPT is stable against a finite (weak) amount of stochasticity. We further show that the passage to the monitored universality occurs abruptly at finite partial post-selection, which we confirm from the numerical finite size scaling of the MiPT. Our approach establishes a way to study MiPTs for arbitrary subsets of quantum trajectories and provides a potential route to tackle the experimental post-selected problem.

Thursday 2 May 2024, 14:30 at IHES, Amphithéâtre Léon Motchane	MATH-IHES (TBA)	math
Sary Drappeau ( Université d’Aix-Marseille )	Quantum Modularity for the q-Pochhammer Symbol
Abstract:	The talk will focus on quantum modularity relations satisfied by the q-Pochhammer symbol $(q)_N = (1-q) ... (1-q^N)$ at $q=\exp(2 \pi i x)$. These formulas can be interpreted as finite analogues of the usual modularity for the Dedekind eta-function. We'll discuss certain aspects which come very handy upon summing over $N$. We'll explain how these can be used, in the context of Kashaev's invariant of hyperbolic knots, to prove, in a few cases, Zagier's quantum modularity conjecture by means of what we currently know on the Volume Conjecture. This is based on joint work with Sandro Bettin.

Thursday 2 May 2024, 15:00 at IPHT, Salle Claude Itzykson, Bât. 774	IPHT-STA (Séminaire de Physique Statistique, CEA/Saclay)	cond-mat
Pierfrancesco Urbani ( IPhT )	Soutenance HDR

Friday 3 May 2024, 10:30 at IHES, Amphithéâtre Léon Motchane	MATH-IHES (TBA)	math
Albert Schwarz ( University of California at Davis & IHES )	Quantitative Hydrodynamic Limit for Interacting Particle Systems: Panorama and Recent Advances (1/4)
Abstract:	The course is based on a minibook that will be published by Springer. The text below is a shortened preface to this book. In the conventional exposition of quantum mechanics, we work in Hilbert space and examine operators within this space. Self-adjoint operators are associated with physical quantities. Physicists predominantly use this methodology, however, it has its limitations. In this course we explore alternative viewpoints; our exposition does not depend on standard textbooks. We consider the algebraic approach, where the initial point is an algebra of observables, an associative algebra with involution, in which the self-adjoint elements are observables. This approach is nearly as old as quantum mechanics itself. In addition, we discuss the geometric approach, where the initial point is a set of states. This viewpoint was advocated in my recent papers; it is much more general. We demonstrate within the framework of this approach that quantum mechanics can be viewed as classical mechanics where our devices permit us to observe only a subset of physical quantities. Furthermore, we show that using this approach we can construct a wide class of physical theories that generalize quantum mechanics. We highlight that the emergence of probabilities in quantum theory can be derived from decoherence caused by adiabatic interaction with a random environment. We underscore that the concept of a particle is not primary in quantum theory. If the theory is translation-invariant we define particles as elementary excitations of the ground state. Quasiparticles are elementary excitations of any translation-invariant state. We analyze the concept of scattering but we do not utilize the concept of a field and do not assume locality and Poincare invariance. We discuss not only the conventional scattering matrix (related to scattering cross-sections) but also the concept of an inclusive scattering matrix, which is closely related to the concept of inclusive scattering cross-sections. Scattering matrix can be expressed in terms of Green's functions by the well-known formula belonging to Lehmann, Symanczyk, and Zimmermann, and the inclusive scattering matrix can be expressed in terms of generalized Green's functions, which first appeared in nonequilibrium statistical physics in Keldysh formalism. As a concrete realization of the geometric approach, we describe the formalism of L-functionals where states are represented by non-linear functionals corresponding to positive functionals on Weyl and Clifford algebras (to states in the algebraic approach). L-functionals can be applied to solve the infrared problem in quantum electrodynamics.

Friday 3 May 2024, 14:00 at IHES, Amphithéâtre Léon Motchane ( Cours de l'IHES )	PT-IHES (Séminaire de physique théorique de l'IHES)	hep-th
Clement Delcamp ( IHES )	Topological Symmetry and Duality in Quantum Lattice Models (4/4)
Abstract:	A modern perspective on symmetry in quantum theories identifies the topological invariance of a symmetry operator within correlation functions as its defining property. In addition to suggesting generalised notions of symmetry, this viewpoint enables a calculus of topological defects, which has a strong category-theoretic flavour, that leverages well-established methods from topological quantum field theory. Focusing on finite symmetries, I will delve during these lectures into a realisation of this program in the context of one-dimensional quantum lattice models. Concretely, I will present a framework for systematically investigating lattice Hamiltonians, elucidating their symmetry operators, defining duality/gauging transformations and computing the mapping of topological sectors through such transformations. Moreover, I will comment on the classification of gapped symmetric phases for generalised symmetry and the construction of the corresponding order/disorder parameters. I will provide explicit treatments of familiar physical systems from condensed matter theory, shedding light on celebrated results and offering resolutions to certain open problems. Time permitting, I will briefly touch upon generalisations to higher dimensions and implications to numerical simulations.

Tuesday 7 May 2024, 10:30 at IHES, Amphithéâtre Léon Motchane	MATH-IHES (TBA)	math
Albert Schwarz ( University of California at Davis & IHES )	Quantitative Hydrodynamic Limit for Interacting Particle Systems: Panorama and Recent Advances (2/4)
Abstract:	The course is based on a minibook that will be published by Springer. The text below is a shortened preface to this book. In the conventional exposition of quantum mechanics, we work in Hilbert space and examine operators within this space. Self-adjoint operators are associated with physical quantities. Physicists predominantly use this methodology, however, it has its limitations. In this course we explore alternative viewpoints; our exposition does not depend on standard textbooks. We consider the algebraic approach, where the initial point is an algebra of observables, an associative algebra with involution, in which the self-adjoint elements are observables. This approach is nearly as old as quantum mechanics itself. In addition, we discuss the geometric approach, where the initial point is a set of states. This viewpoint was advocated in my recent papers; it is much more general. We demonstrate within the framework of this approach that quantum mechanics can be viewed as classical mechanics where our devices permit us to observe only a subset of physical quantities. Furthermore, we show that using this approach we can construct a wide class of physical theories that generalize quantum mechanics. We highlight that the emergence of probabilities in quantum theory can be derived from decoherence caused by adiabatic interaction with a random environment. We underscore that the concept of a particle is not primary in quantum theory. If the theory is translation-invariant we define particles as elementary excitations of the ground state. Quasiparticles are elementary excitations of any translation-invariant state. We analyze the concept of scattering but we do not utilize the concept of a field and do not assume locality and Poincare invariance. We discuss not only the conventional scattering matrix (related to scattering cross-sections) but also the concept of an inclusive scattering matrix, which is closely related to the concept of inclusive scattering cross-sections. Scattering matrix can be expressed in terms of Green's functions by the well-known formula belonging to Lehmann, Symanczyk, and Zimmermann, and the inclusive scattering matrix can be expressed in terms of generalized Green's functions, which first appeared in nonequilibrium statistical physics in Keldysh formalism. As a concrete realization of the geometric approach, we describe the formalism of L-functionals where states are represented by non-linear functionals corresponding to positive functionals on Weyl and Clifford algebras (to states in the algebraic approach). L-functionals can be applied to solve the infrared problem in quantum electrodynamics.

Friday 10 May 2024, 10:30 at IHES, Amphithéâtre Léon Motchane	MATH-IHES (TBA)	math
Albert Schwarz ( University of California at Davis & IHES )	Quantitative Hydrodynamic Limit for Interacting Particle Systems: Panorama and Recent Advances (3/4)
Abstract:	The course is based on a minibook that will be published by Springer. The text below is a shortened preface to this book. In the conventional exposition of quantum mechanics, we work in Hilbert space and examine operators within this space. Self-adjoint operators are associated with physical quantities. Physicists predominantly use this methodology, however, it has its limitations. In this course we explore alternative viewpoints; our exposition does not depend on standard textbooks. We consider the algebraic approach, where the initial point is an algebra of observables, an associative algebra with involution, in which the self-adjoint elements are observables. This approach is nearly as old as quantum mechanics itself. In addition, we discuss the geometric approach, where the initial point is a set of states. This viewpoint was advocated in my recent papers; it is much more general. We demonstrate within the framework of this approach that quantum mechanics can be viewed as classical mechanics where our devices permit us to observe only a subset of physical quantities. Furthermore, we show that using this approach we can construct a wide class of physical theories that generalize quantum mechanics. We highlight that the emergence of probabilities in quantum theory can be derived from decoherence caused by adiabatic interaction with a random environment. We underscore that the concept of a particle is not primary in quantum theory. If the theory is translation-invariant we define particles as elementary excitations of the ground state. Quasiparticles are elementary excitations of any translation-invariant state. We analyze the concept of scattering but we do not utilize the concept of a field and do not assume locality and Poincare invariance. We discuss not only the conventional scattering matrix (related to scattering cross-sections) but also the concept of an inclusive scattering matrix, which is closely related to the concept of inclusive scattering cross-sections. Scattering matrix can be expressed in terms of Green's functions by the well-known formula belonging to Lehmann, Symanczyk, and Zimmermann, and the inclusive scattering matrix can be expressed in terms of generalized Green's functions, which first appeared in nonequilibrium statistical physics in Keldysh formalism. As a concrete realization of the geometric approach, we describe the formalism of L-functionals where states are represented by non-linear functionals corresponding to positive functionals on Weyl and Clifford algebras (to states in the algebraic approach). L-functionals can be applied to solve the infrared problem in quantum electrodynamics.

Monday 13 May 2024, 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
Denis Ullmo	TBA

Tuesday 14 May 2024, 10:30 at IHES, Amphithéâtre Léon Motchane	MATH-IHES (TBA)	math
Albert Schwarz ( University of California at Davis & IHES )	Quantitative Hydrodynamic Limit for Interacting Particle Systems: Panorama and Recent Advances (4/4)
Abstract:	The course is based on a minibook that will be published by Springer. The text below is a shortened preface to this book. In the conventional exposition of quantum mechanics, we work in Hilbert space and examine operators within this space. Self-adjoint operators are associated with physical quantities. Physicists predominantly use this methodology, however, it has its limitations. In this course we explore alternative viewpoints; our exposition does not depend on standard textbooks. We consider the algebraic approach, where the initial point is an algebra of observables, an associative algebra with involution, in which the self-adjoint elements are observables. This approach is nearly as old as quantum mechanics itself. In addition, we discuss the geometric approach, where the initial point is a set of states. This viewpoint was advocated in my recent papers; it is much more general. We demonstrate within the framework of this approach that quantum mechanics can be viewed as classical mechanics where our devices permit us to observe only a subset of physical quantities. Furthermore, we show that using this approach we can construct a wide class of physical theories that generalize quantum mechanics. We highlight that the emergence of probabilities in quantum theory can be derived from decoherence caused by adiabatic interaction with a random environment. We underscore that the concept of a particle is not primary in quantum theory. If the theory is translation-invariant we define particles as elementary excitations of the ground state. Quasiparticles are elementary excitations of any translation-invariant state. We analyze the concept of scattering but we do not utilize the concept of a field and do not assume locality and Poincare invariance. We discuss not only the conventional scattering matrix (related to scattering cross-sections) but also the concept of an inclusive scattering matrix, which is closely related to the concept of inclusive scattering cross-sections. Scattering matrix can be expressed in terms of Green's functions by the well-known formula belonging to Lehmann, Symanczyk, and Zimmermann, and the inclusive scattering matrix can be expressed in terms of generalized Green's functions, which first appeared in nonequilibrium statistical physics in Keldysh formalism. As a concrete realization of the geometric approach, we describe the formalism of L-functionals where states are represented by non-linear functionals corresponding to positive functionals on Weyl and Clifford algebras (to states in the algebraic approach). L-functionals can be applied to solve the infrared problem in quantum electrodynamics.

Tuesday 14 May 2024, 11:00 at LPTMS, Salle des séminaires du FAST et du LPTMS, bâtiment Pascal n°530	LPTMS (Séminaire du Laboratoire de Physique Théorique et Modèles Statistiques (Orsay))	cond-mat.stat-mech
Clément Sire ( LPT Toulouse )	When poor little fish are confronted with AI, robot-fish, virtual reality, and drones
Abstract:	After introducing the collective behaviors observed in fish schools, I will outline a methodology for quantitatively measuring social interactions (attraction/repulsion; alignment) within animal groups. The reconstructed interactions can then be directly implemented in analytical models which quantitatively reproduce the collective motion of fish. I will also briefly address an alternative machine learning approach designed to produce realistic fish trajectories. In the latter part of the presentation, I will explore various applications of such analytical or machine learning behavioral models in the context of robotic and drone platforms, and a virtual reality setup… for fish! In particular, our robot-fish and VR setups constitute original and powerful tools to study the social dynamics of fish and their response to controlled perturbations.

Wednesday 15 May 2024, 13:30 at DPT-PHYS-ENS, ConfIV (E244) - Dépt de Physique de l'ENS - 24 rue Lhomond 75005 PARIS	COLLOQUIUM-ENS (Colloquium of the Physics Department of ENS)	physics
Raymond E. Goldstein	TBA
Abstract:	TBA

Tuesday 21 May 2024, 11:00 at LPTMS, Salle des séminaires du FAST et du LPTMS	LPTMS (Séminaire du Laboratoire de Physique Théorique et Modèles Statistiques (Orsay))	cond-mat.stat-mech
Ricardo Marino ( Google Paris )	TBA

Wednesday 22 May 2024, 12:45 at LPENS, 3 rue d'Ulm	FORUM-ENS (Forum de Physique Statistique @ ENS)	cond-mat.stat-mech
Manon Michel ( Universite Clermont-Auvergne )	TBA
Abstract:	TBA

Thursday 23 May 2024, 11:00 at LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage	SEM-DARBOUX (Séminaire Darboux - physique théorique et mathématiques)	hep-th|math.DG
Eleanora Di Nezza ( IMJ )	TBA

Thursday 23 May 2024, 14:00 at LPTMC, LPTMC seminar room, Jussieu, towers 12-13, 5th floor, room 523	SEM-EXCEP (Seminaire exceptionnel)	cond-mat
Nicolas Bergeal ( ESPCI )	Mesures de densité superfluide dans les supraconducteurs 2D
Abstract:	TBA

Monday 27 May 2024, 13:30 at LPENS, U209 (29 rue d'Ulm)	LPENS-MDQ (Séminaire Matériaux et Dispositifs Quantiques du LPENS)	cond-mat
Sanchar Sharma	TBA

Wednesday 29 May 2024, 12:45 at LPENS, 3 rue dUlm, College de France	FORUM-ENS (Forum de Physique Statistique @ ENS)	cond-mat.stat-mech
Pierfrancesco Urbani ( IPHT )	TBA
Abstract:	T

Monday 3 June 2024, 11:00 at IPHT, Salle Claude Itzykson, Bât. 774	IPHT-STA (Séminaire de Physique Statistique, CEA/Saclay)	cond-mat
Guilhem Semerjian ( LPENS )	TBA
Abstract:	TBA