The SEMPARIS seminar webserver hosts annoucements of all seminars taking place in Paris area, in all topics of physics, mathematics and computer science. It allows registered users to receive a selection of announcements by email on a daily or weekly basis, and offers the possibility to archive PDF or Powerpoint files, making it available to the scientific community. [ More information ]
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Friday 3 May 2024, 14:00 at
IHES,
Amphithéâtre Léon Motchane ( Cours de l'IHES )  PTIHES (Séminaire de physique théorique de l'IHES)  hepth 



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 categorytheoretic flavour, that leverages wellestablished 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 onedimensional 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. 
Monday 13 May 2024, 10:45 at LPTMC, campus Jussieu, couloir 1213, 5ème étage, salle 523  SEMLPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée)  condmat 


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))  condmat.statmech 



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 robotfish 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 DPTPHYSENS, ConfIV (E244)  Dépt de Physique de l'ENS  24 rue Lhomond 75005 PARIS  COLLOQUIUMENS (Colloquium of the Physics Department of ENS)  physics 



Abstract:  TBA 
Thursday 23 May 2024, 11:00 at LPTHE, bibliothèque du LPTHE, tour 1314, 4eme étage  SEMDARBOUX (Séminaire Darboux  physique théorique et mathématiques)  hepthmath.DG 


Thursday 23 May 2024, 14:00 at LPTMC, LPTMC seminar room, Jussieu, towers 1213, 5th floor, room 523  SEMEXCEP (Seminaire exceptionnel)  condmat 



Abstract:  TBA 
Monday 27 May 2024, 13:30 at LPENS, U209 (29 rue d'Ulm)  LPENSMDQ (Séminaire Matériaux et Dispositifs Quantiques du LPENS)  condmat 


Wednesday 29 May 2024, 12:45 at LPENS, 3 rue dUlm, College de France  FORUMENS (Forum de Physique Statistique @ ENS)  condmat.statmech 



Abstract:  T 
Tuesday 4 June 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))  condmat.statmech 


Wednesday 5 June 2024, 13:30 at DPTPHYSENS, ConfIV (E244)  Dépt de Physique de l'ENS  24 rue Lhomond 75005 PARIS  COLLOQUIUMENS (Colloquium of the Physics Department of ENS)  physics 


Thursday 27 February 2025, 14:00 at IJCLAB, A201  NUCTHEO (Séminaire de physique nucléaire théorique)  nuclth 



Abstract:  Whether or not femtoscale droplets of quarkgluon plasma (QGP) are formed in socalled small systems at highenergy colliders is a pressing question in the phenomenology of the strong interaction. For protonproton or protonnucleus collisions the answer is inconclusive due to the large theoretical uncertainties plaguing the description of these processes. While upcoming data on collisions of $^{16}$O nuclei may mitigate these uncertainties in the near future, here we demonstrate the unique possibilities offered by complementing $^{16}$O+$^{16}$O data with collisions of $^{20}$Ne ions. We couple both NLEFT and PGCM ab initio descriptions of the structure of $^{20}$Ne and $^{16}$O to hydrodynamic simulations of $^{16}$O+$^{16}$O and $^{20}$Ne+$^{20}$Ne collisions at high energy. We isolate the imprints of the bowlingpin shape of $^{20}$Ne on the collective flow of hadrons, which can be used to perform quantitative tests of the hydrodynamic QGP paradigm. In particular, we predict that the elliptic flow of $^{20}$Ne+$^{20}$Ne collisions is enhanced by as much as 1.170(8)(30) for NLEFT and 1.139(6)(39)for PGCM relative to $^{16}$O+$^{16}$O collisions for the 1\% most central events. At the same time, theoretical uncertainties largely cancel when studying relative variations of observables between two systems. This demonstrates a method based on experiments with two lightion species for precision characterizations of the collective dynamics and its emergence in a small system.  
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