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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 ]
| Upcoming Seminars | [Next 30 ] | |
| [ scheduler view ] | ||
| Monday 30 May 2022, 10:00 at
LPTHE,
bibliothèque du LPTHE, tour 13-14, 4eme étage ( This is part of the Ulysses Mini-workshop on Black Hole Counting and Topological Strings, taking place on May 30-June 1st in LPTHE. ) | WORK-CONF (Workshop or Conference) | hep-th |
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| Monday 30 May 2022, 10:45 at LPTMC, campus Jussieu, couloir 12-13, 5ème, salle 5-23 | SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) | cond-mat |
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| Abstract: | Résumé: Cette série de deux séminaires, faits en grande partie au tableau, a comme but d'introduire de la façon la plus pédagogique et élémentaire possible la notion de généralisation du théorème de la limite centrale (TCL) et de la relation entre probabilités et (groupe de) renormalisation. Après un rappel de ce qui est bien établi sur le TCL et de ses généralisations aux lois de Lévy stables, sera expliquée la difficulté inhérente au cas où les variables aléatoires sont corrélées. Le groupe de renormalisation fonctionnel (GRF) sera alors introduit et il sera montré que la notion de loi stable en probabilité est très proche (même si pas identique) de la notion de point fixe en renormalisation. Enfin, toutes ces notions seront explicitées sur l'exemple du modèle d'Ising en trois dimensions où l'on montrera que la famille infinie de distributions de probabilité de l'aimantation à la criticalité est reproduite de façon très précise par l'implémentation la plus simple du GRF. | |
| Monday 30 May 2022, 11:00 at IPHT, Salle Claude Itzykson, Bât. 774 | IPHT-PHM (Séminaire de physique mathématique) | math-ph |
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| Abstract: | It has been known for a long time that there are close connections between integrable PDEs and CFT. For example, the deep-water-wave equation called the Benjamin-Ono (BO) equation is integrable and its first quantisation sits in a certain CFT. This connection can be understood by the fact that the BO equation can be obtained as a continuum limit of Calogero-Sutherland (CS) models, the eigenfunctions of which also play a role in the diagonalisation of the CFT. Recently a spin generalisation of the Benjamin-Ono equation was proposed and named the half-wave-maps equation. I will discuss how this equation is related to CS models as well as integrable spin chains, thereby further entangling all these different systems and opening the door for investigations into more complex CFTs. I will show what are the most natural generalisations of this equation, indicating the central role played by chirality. | |
| Monday 30 May 2022, 11:30 at
LPTHE,
bibliothèque du LPTHE, tour 13-14, 4eme étage ( This is part of the Ulysses Mini-workshop on Black Hole Counting and Topological Strings, taking place on May 30-June 1st in LPTHE. ) | WORK-CONF (Workshop or Conference) | hep-th |
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| Monday 30 May 2022, 13:30 at
LPENS,
Salle Dussane - 45 rue d'Ulm ( [1] Ando, Science 312, pp. 1883-1885 (2006) [2] Slota, et al. Nature 557, pp 691–695 (2018) [3] Watts et al. Nature 568, pp 216–220 (2019) ) | LPENS-MDQ (Séminaire Matériaux et Dispositifs Quantiques du LPENS) | cond-mat |
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| Abstract: | Room-temperature ferromagnetic semiconductors offer a viable route to non-volatile digital logic where states can be held without the help of an external driving voltage, drastically lowering the power consumption of electronic circuits [1]. Thus far the search for semiconducting ferromagnets has been dominated by magnetically doped semiconductors where the semiconducting and magnetic properties often exist independently and if coupled, only at low temperatures. Two-dimensional (2D) nanomaterials – particularly in their few to monolayer limit – offer a potentially different route to semiconducting ferromagnetism due to their unique electronic structures [2]. In this talk I will discuss our discovery of the existence of strong room-temperature ferromagnetic correlations along the zigzag edge of semiconducting phosphorene nanoribbons (zPNRs) [3]. I will demonstrate how we can map the magnetic phase diagram of zPNRs to evidence Curie temperature in excess of 350 K and signatures of an antiferromagnetic phase transition at 70 K. By manipulating the ribbon orientation using sub- 1T fields I will further discuss how the ultrafast dipolar dynamics of both in- and out-of-plane excited state electronic transitions can be tracked and the importance of specific phonon modes in controlling magnetism in low dimensions. If time allows, I will briefly show case new methods we are developing to image carrier dynamics in layered materials. | |
| Monday 30 May 2022, 14:30 at IPHT, (voir dans annonce) | IPHT-SEM (Séminaire du IPHT) | physics |
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| Abstract: | ONLINE ONLY LECTURE \\ \\ The program of the lectures will include: \\ 1. Introduction \\ 2. Toy Models for Resurgent Analysis \\ 3. Lefschetz Thimbles, Borel Transforms, Resummations \\ 4. Multidimensional Resurgence and Resonance \\ 5. Alien Calculus Revisited \\ 6. Advanced Applications and String Theory \\ For the complete course program and schedule, please see the course page: https://courses.ipht.fr/?q=en/node/247 \\ WARNING: All the four lectures will be broadcast, but please take note that only the first two lectures (13th and 16th of May) will be in-person (at the IPhT). \\ Non-interactive livestream on youtube.com/IPhT-TV: no subscription required. \\ Videoconference: subscribe to the course newsletter to receive links https://courses.ipht.fr/en/subscriptions \\ In-person audience: facial mask compulsory. | |
| Tuesday 31 May 2022, 10:00 at
LPTHE,
bibliothèque du LPTHE, tour 13-14, 4eme étage ( This is part of the Ulysses Mini-workshop on Black Hole Counting and Topological Strings, taking place on May 30-June 1st in LPTHE. ) | WORK-CONF (Workshop or Conference) | hep-th |
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| Tuesday 31 May 2022, 11:00 at
LPTMS,
Salle des séminaires du FAST et du LPTMS, bâtiment Pascal n°530 ( Hybrid (onsite + zoom) For zoom info, please write to valentina.ros@universite-paris-saclay.fr or check the LPTMS website ) | LPTMS (Séminaire du Laboratoire de Physique Théorique et Modèles Statistiques (Orsay)) | cond-mat.stat-mech |
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| Abstract: | Interacting diffusive particle systems are considered as paradigms for non-equilibrium statistical physics. Their macroscopic behaviour follows a variational principle, proposed by G. Jona-Lasinio and his collaborators, known as the Macroscopic Fluctuation Theory (MFT). Optimal fluctuations far from equilibrium are thus determined at a coarse-grained scale by two coupled non-linear hydrodynamic equations.However, for a long time, only stationary or perturbative solutions of the MFT equations were known. In this talk, we shall show that, for the exclusion process, the MFT equations are classically integrable and can be solved with the help of the inverse scattering method, originally used to study solitons in the KdV or the NLS equations. This exact solution will allow us to calculate the large deviations of the current and the optimal profiles that generates a given fluctuation, both at initial and final times. | |
| Tuesday 31 May 2022, 11:30 at
LPTHE,
bibliothèque du LPTHE, tour 13-14, 4eme étage ( This is part of the Ulysses Mini-workshop on Black Hole Counting and Topological Strings, taking place on May 30-June 1st in LPTHE. ) | WORK-CONF (Workshop or Conference) | hep-th |
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| Tuesday 31 May 2022, 13:30 at APC, seminar room 483A, contact roperpol@apc.in2p3.fr for Zoom meeting details | APC-TH (Seminar of the theory group of APC) | gr-qc |
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| Abstract: | As an extension of Gabor signal processing, the covariant Weyl-Heisenberg integral quantization is implemented to transform functions on the eight-dimensional phase space (x,k) into Hilbertian operators. The x=(x^{\mu}) are space-time variables and the k=(k^{\mu}) are their conjugate wave vector-frequency variables. The procedure is first applied to the variables (x,k) and produces canonically conjugate essentially self-adjoint operators. It is next applied to the metric field g_{\mu\nu}(x) of general relativity and yields regularised semi-classical phase space portraits of it. The latter give rise to modified tensor energy density. Examples are given with the uniformly accelerated reference system and the Schwarzschild metric. Interesting probabilistic aspects are discussed. | |
| Tuesday 31 May 2022, 15:00 at LPTMC, campus Jussieu, couloir 12-13, 5ème, salle 5-23 | SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) | cond-mat |
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| Abstract: | Résumé: Cette série de deux séminaires, faits en grande partie au tableau, a comme but d'introduire de la façon la plus pédagogique et élémentaire possible la notion de généralisation du théorème de la limite centrale (TCL) et de la relation entre probabilités et (groupe de) renormalisation. Après un rappel de ce qui est bien établi sur le TCL et de ses généralisations aux lois de Lévy stables, sera expliquée la difficulté inhérente au cas où les variables aléatoires sont corrélées. Le groupe de renormalisation fonctionnel (GRF) sera alors introduit et il sera montré que la notion de loi stable en probabilité est très proche (même si pas identique) de la notion de point fixe en renormalisation. Enfin, toutes ces notions seront explicitées sur l'exemple du modèle d'Ising en trois dimensions où l'on montrera que la famille infinie de distributions de probabilité de l'aimantation à la criticalité est reproduite de façon très précise par l'implémentation la plus simple du GRF. | |
| Wednesday 1 June 2022, 10:00 at
LPTHE,
bibliothèque du LPTHE, tour 13-14, 4eme étage ( This is part of the Ulysses Mini-workshop on Black Hole Counting and Topological Strings, taking place on May 30-June 1st in LPTHE. ) | WORK-CONF (Workshop or Conference) | hep-th |
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| Wednesday 1 June 2022, 11:30 at
LPTHE,
bibliothèque du LPTHE, tour 13-14, 4eme étage ( This is part of the Ulysses Mini-workshop on Black Hole Counting and Topological Strings, taking place on May 30-June 1st in LPTHE. ) | WORK-CONF (Workshop or Conference) | hep-th |
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| Thursday 2 June 2022, 15:00 at LKB, Room L367 - ENS - 24 rue Lhomond - Paris 5 | SEM-LKB (Séminaire du Laboratoire Kastler Brossel) | quant-ph |
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| Abstract: | Single-photon emitters embedded within a solid-state host make natural candidates for quantum information processing nodes, as they combine: strong confinement of light for efficient light-matter coupling, readily controlled electronic spins for fast processing, and long-lived nuclear spins in the host material for memory. Semiconductor quantum dots in III-V materials and colour centers in diamond are among leading candidate platforms. In this talk, I will summarise my team's recent progress on both systems [1-4], and contextualise their future use for quantum communication and computing technologies as part of my new group’s research programme in Oxford. [1] Jackson et al. (2021). Quantum sensing of a coherent single spin excitation in a nuclear ensemble. Nature Physics 17 (5) [2] Gangloff et al. (2021). Witnessing quantum correlations in a nuclear ensemble via an electron spin qubit. Nature Physics 17 (11) [3] Jackson et al. (2021). Optimal purification of a spin ensemble by quantum- algorithmic feedback. arXiv:2111.04624 [4] Debroux et al. (2021). Quantum control of the tin-vacancy spin qubit in diamond. Phys Rev X 11 (4) | |
| Thursday 2 June 2022, 17:00 at IHP, online | RENC-THEO (Rencontres Théoriciennes) | hep-th |
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| Friday 3 June 2022, 10:00 at IPHT, Salle Claude Itzykson, Bât. 774 | COURS (Cours) | physics |
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| Abstract: | The detection of gravitational waves (GWs) with ground-based interferometers opened a revolutionary vista on the Universe, upending our notions about the origin of stellar-mass black holes, and offering a spectacular multimessenger view of a binary neutron-star merger and of the ensuing radiation across the electromagnetic band.\\ \\ From a fundamental-physics standpoint, GWs provide experimental access to the strong-field regime of general relativity and to precision tests of modified gravity. This whirlwind tour of GW science is meant to give theoretical physicists and non-GW astrophysicists an appreciation of current topics of GW research, as well as an entry point to connect their work with GW applications or observations.\\ \\ The five lectures will cover:\\ GW propagation and detection\\ GW generation and waveform models\\ Astrophysical GW sources, with focus on the LIGO-Virgo catalog\\ GW data analysis, with focus on tests of GR\\ Cosmology and cosmography with GWs\\ Livestream on youtube.com/IPhT-TV: no subscription required\\ Videoconference: subscribe to the course newsletter on the website to receive links\\ courses page :\\ https://courses.ipht.fr/?q=en/node/249 | |
| Friday 3 June 2022, 13:00 at LPENS, Salle Favard (IBENS) | BIOPHY-ENS-ESPCI (Séminaire de biophysique ENS-ESPCI) | physics.bio-ph |
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| Abstract: | tba | |
| Tuesday 7 June 2022, 11:30 at
LPTMS,
Salle des séminaires du FAST et du LPTMS, bâtiment Pascal n°530 ( For zoom info, please write to valentina.ros@universite-paris-saclay.fr or check LPTMS website ) | LPTMS (Séminaire du Laboratoire de Physique Théorique et Modèles Statistiques (Orsay)) | cond-mat.stat-mech |
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| Tuesday 7 June 2022, 14:00 at LPTHE, Library, 4th floor | LPTHE-PPH (Particle Physics at LPTHE) | astro-ph|hep-ph|hep-th |
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| Tuesday 7 June 2022, 16:00 at
IHES,
Salle de conférences du Bâtiment Alix et Marwan Lahoud ( https://indico.math.cnrs.fr/event/7852/ ) | PT-IHES (Séminaire de physique théorique de l'IHES) | cond-mat|hep-th|quant-ph |
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| Abstract: | Landau's theory of Fermi liquids is a cornerstone of theoretical physics. I will show how to formulate Fermi liquid theory as an effective field theory of bosonic degrees of freedom, using the mathematical formalism of coadjoint orbits. While at the linear level, this theory reduces to existing multidimensional bosonization approaches, it necessarily features nonlinear corrections that are fixed by the geometry of the Fermi surface. These are crucial to reproduce nonlinear response, such as higher-point functions of currents. The effective field theory framework furthermore systematically parametrizes corrections to Fermi liquid behavior, and provides a computationally advantageous approach for non-Fermi liquids -- strongly interacting fixed points obtained by deforming Fermi liquids with relevant interactions. | |
| Thursday 9 June 2022, 14:00 at LPTHE, INSP Jussieu towers 22-23 room 3-17 | TQM (Theory of quantum matter) | math-ph |
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| Abstract: | Riwar et al., Nat. Commun. 7, 11167 (2016), ..., Meyer & Houzet, PRB 103, 174504 (2021) | |
| Monday 13 June 2022, 13:30 at LPENS, Salle Assia Djebar - 29 rue d'Ulm | LPENS-MDQ (Séminaire Matériaux et Dispositifs Quantiques du LPENS) | cond-mat |
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| Abstract: | In living matter, a complex network of molecular cascade events involving hundreds of different molecules, which have to diffuse, meet and interact at the correct time and in the correct place is responsible for the transmission of information through cells [1,2]. All these biochemical reactions are highly spatially organized and coordinated. Beyond Brownian diffusion, the way in which the various actors of a given biochemical process, in the overcrowded cellular space, efficiently find each other over long distances is still pending. Among the forces that drives cell organization, one could rely to long-range attractive forces. In this presentation we will show that long-range electrodynamic intermolecular forces [3] between proteins can be activated under suitable experimental conditions. We will describe the activation of out-of-equilibrium collective oscillations of a macromolecule, at the origin of these forces, as a classical phonon condensation phenomenon [4,5], thus, resulting in fingerprints in the TeraHertz (THz) frequency band [6]. [1] L. Dehmelt, & PIH Bastiaens, Nat. Rev. Mol. Cell Biol. 11, 440–452 (2010). [2] K. Venkatesan et al., Nat Methods 6, 83–90 (2009). [3] M. Lechelon et al., Sci. Adv. 8, eabl5855 (2022) [4] H. Froehlich, Nature, vol. 228, 1093 (1970). [5] J. Preto et al., Phys. Rev. E 91, 052710 (2015). [6] I. Nardecchia, et al., Phys Rev. X 031061 (2018). | |
| Tuesday 14 June 2022, 11:00 at
LPTMS,
Salle des séminaires du FAST et du LPTMS, bâtiment Pascal n°530 ( For zoom info, please write to valentina.ros@universite-paris-saclay.fr or check LPTMS website ) | LPTMS (Séminaire du Laboratoire de Physique Théorique et Modèles Statistiques (Orsay)) | cond-mat.stat-mech |
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| Tuesday 14 June 2022, 14:00 at LPTHE, Library, 4th floor | P^3 (Particle Physics in Paris) | astro-ph|hep-ph|hep-th |
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| Thursday 16 June 2022, 10:00 at IHP, 314 presumably | RENC-THEO (Rencontres Théoriciennes) | hep-th |
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| Abstract: | (based on 2111.12092 ) | |
| Friday 17 June 2022, 13:00 at LPENS, Salle Favard, IBENS | BIOPHY-ENS-ESPCI (Séminaire de biophysique ENS-ESPCI) | physics.bio-ph |
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| Abstract: | tba | |
| Tuesday 21 June 2022, 11:00 at
LPTMS,
Salle des séminaires du FAST et du LPTMS, bâtiment Pascal n°530 ( For zoom info, please write to valentina.ros@universite-paris-saclay.fr or check LPTMS website ) | LPTMS (Séminaire du Laboratoire de Physique Théorique et Modèles Statistiques (Orsay)) | cond-mat.stat-mech |
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| Thursday 23 June 2022, 11:00 at
LPTMS,
Salle des séminaires du FAST et du LPTMS, bâtiment Pascal n°530 ( For zoom info, please write to valentina.ros@universite-paris-saclay.fr or check LPTMS website ) | LPTMS (Séminaire du Laboratoire de Physique Théorique et Modèles Statistiques (Orsay)) | cond-mat.stat-mech |
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| Friday 24 June 2022, 13:00 at LPENS, Salle Favard IBENS | BIOPHY-ENS-ESPCI (Séminaire de biophysique ENS-ESPCI) | physics.bio-ph |
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| Abstract: | tba | |
| Tuesday 28 June 2022, 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 |
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