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Upcoming Seminars
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Tuesday 20 August 2019, 13:30 at LPT, 114
( This is the first of a series of lectures on neutron stars. This one will be quite elementary, subsequent lectures will be more advanced. )
LPT-PTH (Particle Theory Seminar of LPT Orsay) nucl-th
Natsumi Nagata ( Tokyo University ) Introduction to neutron stars
Abstract: In this first lecture, I will talk about the basics of neutron stars. I will first give a historical review on neutron stars, such as on the first theoretical prediction of neutron stars, the first neutron star model, the discovery of pulsars, and their identification to neutron stars. Then, I will discuss the properties of neutron stars and the observational confirmation of these properties.

Tuesday 3 September 2019, 11:00 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-GEN (Séminaire général du SPhT) physics
Alexander Turbiner ( ICN-UNAM, Mexico and Stony Brook University, USA ) Choreography in Physics (living in motion, moving polymers, superintegrability etc)
Abstract: By definition the choreography (dancing curve) is a closed trajectory on which $n$ classical bodies move chasing each other without collisions. The first choreography (the Remarkable Figure Eight) at zero angular momentum was discovered unexpectedly by C Moore (Santa Fe Institute) at 1993 for 3 equal masses in $R^3$ Newtonian gravity numerically. At the moment about 6,000 choreographies in $R^3$ Newtonian gravity are found, all numerically for different $n > 2$. A number of 3-body choreographies is known in $R^2$ Newtonian gravity, for Lennard-Jones potential (hence, relevant for molecular physics), and for some other potentials, again numerically; it might be proved their existence for quarkonia potential. \par Does exist (non)-Newtonian gravity for which dancing curve is known analytically? - Yes, a single example is known - it is algebraic lemniscate by Jacob Bernoulli (1694) - and it will be a concrete example of the talk. Astonishingly, $R^3$ Newtonian Figure Eight coincides with algebraic lemniscate with $\chi^2$ deviation $\sim 10^{-7}$. Both choreographies admit any odd numbers of bodies on them. Both 3-body choreographies define maximally superintegrable trajectory with 7 constants of motion. \par Talk will be accompanied by numerous animations.

Wednesday 4 September 2019, 14:15 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires) hep-th
Stefano Andriolo ( Hong Kong University of Science and Technology ) (TBA)
Abstract: (TBA)

Friday 6 September 2019, 14:00 at LPTHE, library LPTHE-PPH (Particle Physics at LPTHE) hep-ph
Natsumi Nagata ( Tokyo U. ) TBA

Tuesday 10 September 2019, 11:00 at LPTENS, LPTENS library STRINT (Strings, integrability and beyond) hep-th
Sylvain Lacroix ( Hamburg University ) TBA

Friday 13 September 2019, 11:00 at LPTHE, Bibliothèque SEM-LPTHE (Séminaire du LPTHE) cond-mat.stat-mech|hep-th|math|math-ph
Sylvain Lacroix ( DESY Hambourg ) Integrable coupled sigma-models from affine Gaudin models
Abstract: In this seminar, I will discuss integrable systems called affine Gaudin models and their application to the study of integrable sigma models. As an introductory example, I will first discuss a simpler class of Gaudin models, the finite ones, and their relation with integrable spin chains and mechanical systems. I will then explain how to use affine Gaudin models to construct new integrable classical sigma models, by coupling together an arbitrary number of principal chiral models with Wess-Zumino terms.

Monday 16 September 2019, 10:45 at LPTMC, Jussieu, tower 13-12, room 5-23 SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) cond-mat.mes-hall
Ivan Dornic ( SPEC Saclay & LPTMC ) A tale of Pfaffian persistence tails told by a Painlevé VI transcendent
Abstract: We identify the persistence probability for the spin located at the origin of a half-space magnetized Glauber-Ising chain as a Fredholm Pfaffian gap probability generating function with a sech-kernel. This is then recast as a tau-function for a certain Painlevé VI transcendent --- a sort of exact Kramers' formula for the associated explicitely time-dependent Hamiltonian --- where the persistence exponent emerges as an asymptotic decay rate. By a known yet remarkable correspondence that relates Painlevé equations to Bonnet surfaces, the persistence probability has also a geometric meaning à la Gauss-Bonnet in terms of the intrinsic curvature of the underlying surface. Since the same sech-kernel with an underlying Pfaffian structure shows up in a variety of Gaussian first-passage problems, our Painlevé VI characterization appears as a universal probability distribution akin to the famous Painlevé II Tracy-Widom laws. Its tail behavior in the magnetization-symmetric case allows in particular to recover the exact value 3/16 for the persistence exponent of a 2d diffusing random field, as found very recently by Poplavskyi and Schehr (arXiv:1806.11275). Due to its topological origin, this value should constitute the super-universal persistence exponent for the coarsening of a non-conserved scalar order parameter in two space dimensions.

Monday 16 September 2019, 14:00 at LPNHE, Amphi Charpak LPNHE (Séminaires du LPNHE) hep-ex
Loïc Valery ( LPC Clermont Ferrand ) TBA

Tuesday 17 September 2019, 11:30 at LPTHE, LPTHE library STR-LPT-ENS-HE (Séminaire commun LPTENS/LPTHE) hep-th
Diksha Jain ( ICTP ) TBA
Abstract: (based on 1905.05207 )

Wednesday 18 September 2019, 13:45 at DPT-PHYS-ENS, Sorbonne Université – 4, place Jussieu – 75005 Paris, Room : TBC SEM-PHYS-ENS (Colloquium du Département de Physique de l'ENS) quant-ph
Monika Schleier Smith ( Stanford ) Choreographing Quantum Spin Dynamics with Light
Abstract: The dream of the quantum engineer is to have an “arbitrary waveform generator” for designing quantum states and Hamiltonians. Motivated by this vision, I will report on advances in optical control of long-range interactions among cold atoms. By coupling atoms to light in an optical resonator, we induce tunable non-local spin-spin interactions, characterizing the resulting dynamics by real-space imaging. Notably, in a spin-1 system, we observe photon-mediated spin mixing, a new mechanism for producing correlated atom pairs. In a separate platform, we employ Rydberg dressing to induce Ising interactions in a dilute gas of cesium atoms in their hyperfine clock states, enabling the realization of a Floquet transverse-field Ising model. I will discuss prospects in quantum simulation and quantum metrology promised by the versatility of optical control. [1] Ar-39 dating with small samples provides new key constraints on ocean ventilation, Nature Comm. 9, 5046 (2018).[2] Observation of universal dynamics in a spinor Bose gas far from equilibrium, Nature 563, 217 (2018).

Monday 23 September 2019, 10:45 at LPTMC, Jussieu, tower 13-12, room 5-23 SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) cond-mat.mes-hall
Juliette Mignot ( IPSL-LOCEAN Jussieu ) Changement climatique et mesures concrètes prises par des labos (provisoire)

Thursday 26 September 2019, 11:00 at LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage SEM-DARBOUX (Séminaire Darboux - physique théorique et mathématiques) math.AG
Bertrand Eynard ( CEA Saclay ) TBA

Monday 30 September 2019, 10:45 at LPTMC, Jussieu, tower 13-12, room 5-23 SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) cond-mat.mes-hall
Claude Loverdo ( Laboratoire Jean Perrin, Paris ) Biophysique (provisoire)

Wednesday 2 October 2019, 14:15 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires) hep-th
Elias Kiritsis ( APC ) (TBA)

Monday 7 October 2019, 11:00 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-PHM (Séminaire de physique mathématique) math-ph
Alexander M. Povolotsky ( Joint Institute for Nuclear Research, Dubna ) Statistics of Avalanche Currents in the Raise and Peel model
Abstract: The Raise and Peel model is a stochastic model of fluctuating interface with non-local avalanche dynamics. Its dynamical rules stem from the  structure of a specific representation of the Temperley-Lieb algebra, and its stochastic generator can be represented by the Hamiltonian of the XXZ Heisenberg quantum spin chain with twisted boundary conditions.  We describe the  recent progress  in description of the statistics of the avalanches in the model. We focus on the large deviations of two avalanche currents in the thermodynamic limit,  which reveal a  phase transition in the behaviour of one current conditioned to  atypical values of another one. We  also describe a proof of the  laws of  large numbers for the two currents at arbitrary finite lattices, which in addition proves two earlier conjectures on the structure of the stationary state of the model. The technique is based on the analysis of the largest eigenvalue of the deformed stochastic generator using the Bethe ansatz and Baxter

Thursday 10 October 2019, 11:00 at LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage SEM-DARBOUX (Séminaire Darboux - physique théorique et mathématiques) math.NT
Gaetan Chenevier ( Institut de Mathématique d'Orsay ) TBA

Tuesday 22 October 2019, 11:30 at LPTENS, LPTENS library STR-LPT-ENS-HE (Séminaire commun LPTENS/LPTHE) hep-th
Ida Zadeh ( ICTP ) TBA

Monday 25 November 2019, 10:45 at LPTMC, Jussieu, tower 13-12, room 5-23 SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) cond-mat.mes-hall
Janos Asboth ( Budapest ) Marche quantique sous champ magnétique (provisoire)

Monday 9 December 2019, 10:45 at LPTMC, Jussieu, tower 13-12, room 5-23 SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) cond-mat.mes-hall
Cesare Nardini ( CEA SPEC Saclay ) Matière active (provisoire)

Thursday 12 December 2019, 11:00 at LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage SEM-DARBOUX (Séminaire Darboux - physique théorique et mathématiques) math.AG
Emanuele Macri ( Northeastern University ) TBA

seminars from series at institute
in subject with field matching

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