Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

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 ]


[Previous 30 ] Upcoming Seminars [Next 30 ]
[ scheduler view ]

Wednesday 17 May 2017, 11:00 at LPTHE, Bibliothèque SEM-INFOR (Séminaire informel) hep-th|math|math-ph|math.AG|math.CO|math.KT|math.MP|math.QA
Paul Zinn-Justin ( University of Melbourne ) Schubert calculus and quantum integrability (2/3)
Abstract: Schubert calculus is a branch of enumerative geometry, which deals with configurations of linear subspaces of a vector space. Translated into the modern language, it amounts to certain calculations in the cohomology ring of Grassmannians and flag varieties. A practical problem is to give a combinatorial rule for the structure constants of that ring. A few years ago, I observed that there was a hidden quantum integrability in the case of Grassmannians (for which the combinatorial rule is the so-called Littlewood--Richardson rule). In a somewhat unrelated development, there has been a growing body of work (including my own) showing the deep connection between cohomology theories (ordinary cohomology, K-theory, elliptic cohomology) and quantum integrable systems. In particular Maulik and Okounkov introduced a nice framework for this connection. It is natural to try to reinterpret my observation above in this language. After introducing these various concepts, I shall present recent work with A. Knutson in this direction. In particular, this provides completely new rules for the calculation of structure constants of the equivariant cohomology or K-theory of d-step flag varieties for d smaller or equal to 4, thus moving several "steps" closer to the completion of the program of Schubert calculus.

Wednesday 17 May 2017, 14:15 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires) hep-th
Harold Erbin ( LPTHE ) (TBA)

Thursday 18 May 2017, 13:30 at DPT-PHYS-ENS, room Conf. IV, 24 Rue Lhomond, ENS Paris SEM-PHYS-ENS (Colloquium du Département de Physique de l'ENS) cond-mat
Jean-Noël Fuchs ( Laboratoire de Physique Théorique de la Matière Condensée, UPMC ) TBA

Friday 19 May 2017, 11:30 at SAMM, C20.13, Centre Pierre Mendès-France, Univ. Paris-1, 90 rue de Tolbiac, Paris SAMM (Statistics, Analysis, Multidisciplinary Modeling) cond-mat.stat-mech|math.PR|math.ST
Céline Duval ( MAP5 - Univ. Paris Descartes ) Compound Poisson approximation to estimate the Lévy density
Abstract: We construct an estimator of the Lévy density, with respect to the Lebesgue measure, of a pure jump Lévy process from high frequency observations. The main novelty of our result is that we directly estimate the Lévy density in cases where the process may present infinite activity. Moreover, we study the risk of the estimator with respect to $L_p$ loss functions, $1\leq p < \infty$ The main idea behind the estimation procedure that we propose is to use that "every infinitely divisible distribution is the limit of a sequence of compound Poisson distributions" and to take advantage of the fact that it is well known how to estimate the Lévy density of a compound Poisson process in the high frequency setting. We consider linear wavelet estimators and the performance of our procedure is studied in term of L_p loss functions. The results are illustrated with several examples.

Tuesday 23 May 2017, 14:00 at LPTHE, LPTHE Library STR-LPT-ENS-HE (Séminaire commun LPTENS/LPTHE) hep-th
Harold Erbin ( LPTENS ) Recent developments in superstring field theory
Abstract: I will review some recent developments of type II and heterotic superstring field theory. The approach I will follow is due to Ashoke Sen and based on the construction of the open-closed bosonic string field theory by Zwiebach. Particular attention will be devoted to the three main challenges faced by superstring field theory: inclusion of the Ramond sector, removal of spurious singularities due to the superconformal ghosts and definition of a prescription for the off-shell amplitudes. The plan is the following: 1) motivations, divergences in (super)string theory and off-shell amplitudes; 2) superstring field theory: gauge fixed and quantum action, construction of the Ramond sector 3) momentum representation of amplitudes, applications: unitarity, soft theorems

Tuesday 23 May 2017, 14:00 at APC, 483 A - Malevitch APC-TH (Seminar of the theory group of APC) hep-th
Gary Gibbons ( Cambridge University ) TBA

Tuesday 23 May 2017, 16:00 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-HEP (Séminaire de physique des particules et de cosmologie) hep-ph
Jérôme Gleyzes ( JPL and Caltech ) Consistency relations of the large scale structure and how to break them
Abstract: Upcoming cosmological experiments intend to exploit the large scale structure of the Universe to get a better understanding of the observed cosmic acceleration. By measuring the power spectrum, one can constrain the equation of state of dark energy, and galaxy surveys promise great improvement over the current constraints. Galaxy surveys can also be used to gather cosmological information beyond cosmic acceleration. For example, one can derive consistency relations that can relate the bispectrum to the power spectrum for example. Those relations are very robust, as they rely on only two assumptions: the equivalence principle and the gaussianity of initial conditions. They are thus expected to hold within the standard cosmological model. On the other hand, their potential violation can be used to put bound on theories that predict deviations from one of those two assumptions, which is what I will explore in this talk.

Wednesday 24 May 2017, 11:00 at LPTHE, Bibliothèque SEM-INFOR (Séminaire informel) hep-th|math|math-ph|math.AG|math.CO|math.KT|math.MP|math.QA
Paul Zinn-Justin ( University of Melbourne ) Schubert calculus and quantum integrability (3/3)
Abstract: Schubert calculus is a branch of enumerative geometry, which deals with configurations of linear subspaces of a vector space. Translated into the modern language, it amounts to certain calculations in the cohomology ring of Grassmannians and flag varieties. A practical problem is to give a combinatorial rule for the structure constants of that ring. A few years ago, I observed that there was a hidden quantum integrability in the case of Grassmannians (for which the combinatorial rule is the so-called Littlewood--Richardson rule). In a somewhat unrelated development, there has been a growing body of work (including my own) showing the deep connection between cohomology theories (ordinary cohomology, K-theory, elliptic cohomology) and quantum integrable systems. In particular Maulik and Okounkov introduced a nice framework for this connection. It is natural to try to reinterpret my observation above in this language. After introducing these various concepts, I shall present recent work with A. Knutson in this direction. In particular, this provides completely new rules for the calculation of structure constants of the equivariant cohomology or K-theory of d-step flag varieties for d smaller or equal to 4, thus moving several "steps" closer to the completion of the program of Schubert calculus.

Thursday 1 June 2017, 10:00 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
David Tong ( Cambridge U. ) TBA

Thursday 1 June 2017, 11:45 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Mike Blake ( MIT ) TBA

Thursday 1 June 2017, 13:30 at DPT-PHYS-ENS, room Conf. IV, 24 Rue Lhomond, ENS Paris SEM-PHYS-ENS (Colloquium du Département de Physique de l'ENS) physics.optics
Stefan Rotter ( TU Vienna ) TBA

Friday 2 June 2017, 10:00 at IPHT, Salle Claude Itzykson, Bât. 774
( https://courses.ipht.cnrs.fr/?q=fr/node/168 )
COURS (Cours) cond-mat|quant-ph
Michel Bauer ( IPhT ) An introduction to Markovian open quantum systems (1/5)
Abstract: (TBA)
Attachments:
  • 2016-2017.pdf (5422338 bytes) OPEN

Tuesday 6 June 2017, 13:30 at DPT-PHYS-ENS, room Conf. IV, 24 Rue Lhomond, ENS Paris
( ¡¡ Please be aware of the unusual date: Tuesday !! )
SEM-PHYS-ENS (Colloquium du Département de Physique de l'ENS) cond-mat.mtrl-sci
Marvin Cohen ( University of California, Berkeley ) TBA

Tuesday 6 June 2017, 14:00 at APC, 483 A - Malevitch APC-TH (Seminar of the theory group of APC) hep-th
David Wiltshire ( University of Canterbury, New Zealand ) TBA

Tuesday 6 June 2017, 14:00 at LPTHE, Library LPTHE-PPH (Particle Physics at LPTHE) hep-ph
Diego Redigolo ( Weizmann and Tel-Aviv University ) TBA

Friday 9 June 2017, 10:00 at IPHT, Salle Claude Itzykson, Bât. 774
( https://courses.ipht.cnrs.fr/?q=fr/node/168 )
COURS (Cours) cond-mat|quant-ph
Michel Bauer ( IPhT ) An introduction to Markovian open quantum systems (2/5)
Abstract: (TBA)
Attachments:
  • 2016-2017.pdf (5422338 bytes) OPEN

Tuesday 13 June 2017, 14:00 at APC, 483 A - Malevitch APC-TH (Seminar of the theory group of APC) hep-th
Kalioppi Petraki ( LPTHE, UPMC ) TBA

Thursday 15 June 2017, 10:00 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Carlos Hoyos ( University of Oviedo ) TBA

Thursday 15 June 2017, 11:45 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Thomas Hertog ( University of Leuven ) TBA

Thursday 15 June 2017, 13:30 at DPT-PHYS-ENS, room Conf. IV, 24 Rue Lhomond, ENS Paris SEM-PHYS-ENS (Colloquium du Département de Physique de l'ENS) physics.med-ph
Alain Fischer ( Collège de France ) TBA

Friday 16 June 2017, 10:00 at IPHT, Salle Claude Itzykson, Bât. 774
( https://courses.ipht.cnrs.fr/?q=fr/node/168 )
COURS (Cours) cond-mat|quant-ph
Michel Bauer ( IPhT ) An introduction to Markovian open quantum systems (3/5)
Abstract: (TBA)
Attachments:
  • 2016-2017.pdf (5422338 bytes) OPEN

Tuesday 20 June 2017, 14:00 at APC, 483 A - Malevitch APC-TH (Seminar of the theory group of APC) hep-th
Manibrata Sen ( Tata Institute of Fundamental Research, Mumbai ) TBA

Thursday 22 June 2017, 13:30 at DPT-PHYS-ENS, room Conf. IV, 24 Rue Lhomond, ENS Paris SEM-PHYS-ENS (Colloquium du Département de Physique de l'ENS) physics.optics
Maxime Jacquot ( Institut FEMTO-ST, Université de Franche-Comté ) TBA

Friday 23 June 2017, 10:00 at IPHT, Salle Claude Itzykson, Bât. 774
( https://courses.ipht.cnrs.fr/?q=fr/node/168 )
COURS (Cours) cond-mat|quant-ph
Michel Bauer ( IPhT ) An introduction to Markovian open quantum systems (4/5)
Abstract: (TBA)
Attachments:
  • 2016-2017.pdf (5422338 bytes) OPEN

Tuesday 27 June 2017, 11:00 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-SEM (Séminaire du IPHT) physics
Giulio Biroli (TBA)

Tuesday 27 June 2017, 14:00 at IPHT, Salle Claude Itzykson, Bât. 774 SOUTEN-TH (Soutenance de thèse) physics
Michele Mancarella ( IPhT ) (TBA)

Thursday 29 June 2017, 13:30 at DPT-PHYS-ENS, room Conf. IV, 24 Rue Lhomond, ENS Paris SEM-PHYS-ENS (Colloquium du Département de Physique de l'ENS) hep-th
Dam Thanh Son ( University of Chicago ) TBA

Friday 30 June 2017, 10:00 at IPHT, Salle Claude Itzykson, Bât. 774
( https://courses.ipht.cnrs.fr/?q=fr/node/168 )
COURS (Cours) cond-mat|quant-ph
Michel Bauer ( IPhT ) An introduction to Markovian open quantum systems (5/5)
Abstract: (TBA)
Attachments:
  • 2016-2017.pdf (5422338 bytes) OPEN

Friday 7 July 2017, 13:30 at IPHT, Salle Claude Itzykson, Bât. 774 SOUTEN-TH (Soutenance de thèse) physics
Soumya Sasmal ( IPhT ) (TBA)

Thursday 21 September 2017, 13:30 at IPHT, Amphi Claude Bloch, Bât. 774 SOUTEN-TH (Soutenance de thèse) physics
Lais Sarem-Schunk ( IPhT ) (TBA)

seminars from series at institute
in subject with field matching

[ Postscript Poster Aide | PDF Poster Aide | RSS Thread | ICal Format Aide ]

You are invited to subscribe to SEMPARIS mailing lists in order to receive selected announcements by email.

[ Annonces ]    [ Abonnements ]    [ Archive ]    [ Aide ]    [ ]
[ English version ]