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Wednesday 9 October 2019, 12:00 at LPENS, Conf IV FORUM-ENS (Forum de Physique Statistique @ ENS) cond-mat.stat-mech
Alexander Povolotsky ( BLTP, JINR, HSE ) TBA

Wednesday 9 October 2019, 14:15 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires) hep-th
Fabrizio Cordonier (TBA)

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

Friday 11 October 2019, 10:00 at IPHT, Salle Claude Itzykson, Bât. 774
( https://courses.ipht.cnrs.fr/?q=en/node/226 )
COURS (Cours) hep-th|math-ph|quant-ph
Slava Rychkov ( IHES, ENS ) Lorentzian methods in conformal field theory (3/4)
Abstract: Paraphrasing Alexander Polyakov, ``Conformal Field Theory is a way to learn about elementary particles by studying boiling water''. There is a technical statement behind this joke: Euclidean Conformal Field Theory, under certain conditions, can be rotated to the Lorentzian signature, and vice versa. This means that even statistical physicists studying finite-temperature phase transitions on a lattice should learn about the Minkowski space! The goal of this course will be to explain various classical and recent results pertaining to this somewhat surprising conclusion. \\ \\ Plan of the course: \\ - Elementary introduction to Euclidean CFT in $d>2$ dimensions; \\ - The Osterwalder--Schrader theorem about the Wick rotation of general reflection-positive Euclidean Quantum Field Theories, and its limitations; \\ - The Luescher--Mack theorem about continuation of CFT correlation functions to the Lorentzian cylinder, and its limitations; \\ - Recent results about the analytic structure of Lorentzian CFT correlators.
Attachments:
  • 2019_Rychkov.pdf (4580711 bytes) OPEN
  • 2019-2020.pdf (4458798 bytes) OPEN

Monday 14 October 2019, 10:45 at LPTMC, campus Jussieu, tower 13-12, 5th floor, room 523 SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) cond-mat.mes-hall
Marco Marciani ( Laboratoire de Physique, ENS Lyon ) Optical topological chiral modes flowing between non-topological materials
Abstract: The most remarkable feature of the so-called "topological crystals" is the presence of states flowing at their edge that are robust against disorder. A beautiful mathematical theory allows to predict the properties of such states directly from the topological invariants (e.g. the Chern numbers) of the bulk bands. Given the great success of this theory in terms of theoretical impact and technological advance, in recent years much effort has been put to make the extension from the field electronics to other fields[1] and from crystals to various non-crystaline systems such as quasi-crystals and amorphous materials. In this talk I will show how deal with continuous systems governed by linear Maxwell's equations[2]. Even though bands Chern numbers cannot be defined and optical materials are non-topological, we discover that interface Chern numbers can always be defined by means of the theory of spectral flows[3]. These invariants correctly describe chiral modes as we verified numerically on interfaces between different gyrotropic materials. [1] S. Raghu and F. D. M. Haldane, Phys. Rev. A78, 033834 (2008). [2] M. G. Silveirinha, Phys. Rev. B92, 125153 (2015). [3] M. Marciani and P. Delplace, arXiv:1906.09057 (2019).

Monday 14 October 2019, 14:00 at LPTM, 4.13 St Martin II SOUTEN-TH (Soutenance de thèse) quant-ph
Quentin Duprey ( LPTM Cergy ) Valeurs Faibles, Trajectoires faibles et interférométrie
Abstract: La théorie de la mesure, basée sur la mesure projective, constitue un aspect fondamental de la mécanique quantique. La mesure faible diffère de la mesure projective traditionnelle sur laquelle les axiomes élémentaires de la physique quantique sont bâtis. Bien que définie dans le cadre de la théorie quantique standard, les mesures faibles sont encore mal comprises. Le travail de thèse s'inscrit dans une large démarche qui vise à comprendre les implications conceptuelles et pratiques d'une telle mesure dans le cadre de la théorie quantique. Le chapitre 1 est une introduction détaillée à la mesure faible et à la valeur faible. Ensuite, nous étudierons les "trajectoires faibles" dans un interféromètre à fentes d'Young. Nous abordons au chapitre 3 les implications de l'annulation d'une valeur faible au regard de l'apparition de trajectoires faibles dans des interféromètres de Mach-Zender imbriqués. Enfin, le chapitre 4 traite des critiques théoriques et expérimentales présentes dans la littérature concernant l'effet du Chat du Cheshire quantique qui est défini dans le cadre de mesures faibles.

Monday 14 October 2019, 14:00 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-STA (Séminaire de Physique Statistique, CEA/Saclay) cond-mat
Alexander Altland ( University of Cologne ) (TBA)

Tuesday 15 October 2019, 14:00 at APC, 646A - Mondrian APC-TH (Seminar of the theory group of APC) gr-qc
Karim Van Aelst TBA

Tuesday 15 October 2019, 16:30 at LPTM, 4.13 St Martin II SEM-EXCEP (Séminaire exceptionel) physics.flu-dyn
John Bush ( MIT Cambridge, Mass. USA ) Hydrodynamic quantum analogs: droplets walking on the impossible pilot wave
Abstract: Yves Couder and Emmanuel Fort discovered that droplets walking on a vibrating fluid bath exhibit several features previously thought to be exclusive to the microscopic, quantum realm. These walking droplets propel themselves by virtue of a resonant interaction with their own wave field, and so represent the first macroscopic realization of a pilot-wave system of the form proposed for microscopic quantum dynamics by Louis de Broglie in the 1920s. New experimental and theoretical results allow us to rationalize the emergence of quantum-like behavior in this hydrodynamic pilot-wave system in a number of settings, and explore its potential and limitations as a quantum analog.

Wednesday 16 October 2019, 12:00 at LPENS, Conf IV FORUM-ENS (Forum de Physique Statistique @ ENS) cond-mat.stat-mech
Valentina Ros ( ENS ) TBA

Wednesday 16 October 2019, 14:15 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires) hep-th
Andrei Constantin ( Oxford ) (TBA)

Thursday 17 October 2019, 11:40 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Jock Mcorist ( Surrey ) TBA

Thursday 17 October 2019, 14:00 at LPTMC, campus Jussieu, tower 13-12, 5th floor, room 523 SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) cond-mat.mes-hall
Valentina Ros ( IPhT CEA Saclay ) TBA

Friday 18 October 2019, 10:00 at IPHT, Salle Claude Itzykson, Bât. 774
( https://courses.ipht.cnrs.fr/?q=en/node/226 )
COURS (Cours) hep-th|math-ph|quant-ph
Slava Rychkov ( IHES, ENS ) Lorentzian methods in conformal field theory (4/4)
Abstract: Paraphrasing Alexander Polyakov, ``Conformal Field Theory is a way to learn about elementary particles by studying boiling water''. There is a technical statement behind this joke: Euclidean Conformal Field Theory, under certain conditions, can be rotated to the Lorentzian signature, and vice versa. This means that even statistical physicists studying finite-temperature phase transitions on a lattice should learn about the Minkowski space! The goal of this course will be to explain various classical and recent results pertaining to this somewhat surprising conclusion. \\ \\ Plan of the course: \\ - Elementary introduction to Euclidean CFT in $d>2$ dimensions; \\ - The Osterwalder--Schrader theorem about the Wick rotation of general reflection-positive Euclidean Quantum Field Theories, and its limitations; \\ - The Luescher--Mack theorem about continuation of CFT correlation functions to the Lorentzian cylinder, and its limitations; \\ - Recent results about the analytic structure of Lorentzian CFT correlators.
Attachments:
  • 2019_Rychkov.pdf (4580711 bytes) OPEN
  • 2019-2020.pdf (4458798 bytes) OPEN

Wednesday 23 October 2019, 14:00 at IPN, Bâtiment 100, Salle A015
( $ $ )
IPN-THEO (Séminaire du groupe de physique théorique de l'IPN Orsay) nucl-th
T. Otsuka ( The university of Tokyo, Tokyo, Japon ) Underlying structure of collective bands of nuclei and self-organization mechanism.
Abstract: The interplay between the single-particle states and the collective modes has been one of the central subjects of nuclear physics since the very beginning. If the single-particle aspect is too strong, for instance, with a large gap between relevant orbits, it suppresses the collective mode. Thus, the single-particle states and the collective modes have been considered to counteract each other, and the former behaves as a resistance against the latter. However, an opposing idea has arisen recently. The nuclear force is characterized by components driving a given collective mode, like the quadrupole interaction for the ellipsoidal shape and, in addition, by the monopole component that can reduce the resistance against collective modes. The energies of single-particle orbits can thus be optimized for a given mode with favorable configurations. In fact, the monopole components of the central and tensor forces show strong orbital dependences, and can shift single-particle energies effectively depending on the configurations of other nucleons. This mechanism can be interpreted as a quantum self-organization, and is consistent with the general self-organization concept. Its effect can be seen in the quantum phase transition of Zr isotopes [1], and more generally in the shape evolution in Sm isotopes as well as the band structure of $^{154}$Sm. The state-of-the-art Monte Carlo Shell Model calculations with reasonable interactions produce properties of these nuclei in good agreement with experiments. The monopole-controlled optimization is shown to be essential: if it is switched off, this good agreement disappears. One of the striking results is that contrary to the traditional idea, side bands of strongly deformed nuclei may not be beta or gamma vibration of the ellipsoidal shape, but can be consequences of many-body correlations due to nuclear forces, beyond the liquid drop model. A textbook example of $^{166}$Er shows that its key properties are reproduced by the shell-model solution obtained around a triaxial minimum with strong gamma-instability, including the relatively strong $0^+_1$, $2^+_2$ E2 excitation. Prospects over heavy nuclei and fission processes and possible experimental challenges will be discussed.\newline [1] T. Otsuka, Y. Tsunoda, et al., arXiv: 1907.10759 [nucl-th].
Attachments:
  • 2019_10_23_T_Otsuka.pdf (217263 bytes) OPEN

Friday 25 October 2019, 11:00 at APC, TBA APC-COLLOQUIUM (Colloquium de l'APC) astro-ph
Thierry Lasserre TBA

Monday 4 November 2019, 14:00 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-STA (Séminaire de Physique Statistique, CEA/Saclay) cond-mat
Anne-Florence Bitbol ( Jean Perrin, UPMC ) (TBA)

Tuesday 5 November 2019, 14:00 at APC, 646A - Mondrian APC-TH (Seminar of the theory group of APC) gr-qc
Kunihito Uzawa TBA

Wednesday 6 November 2019, 14:15 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires) hep-th
Pushkal Shrivastava ( ICTS-TIFR, Bangalore ) (TBA)
Abstract: (TBA)

Friday 8 November 2019, 11:00 at APC, 366A APC-COLLOQUIUM (Colloquium de l'APC) astro-ph
Sandrine Codis ( IAP ) TBA
Abstract: TBA

Friday 8 November 2019, 14:15 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires) hep-th
Jnanadeva Maharana ( Institute of Physics and NISER, Bhubaneswar ) (TBA)

Tuesday 12 November 2019, 11:00 at CPHT, Salle Louis Michel, CPHT, Ecole Polytechnique SEM-CPHT (Séminaire du CPHT) hep-th
Natalia Pinzani Fokeeva ( KU Leuven ) TBA

Tuesday 12 November 2019, 14:00 at APC, 646A - Mondrian APC-TH (Seminar of the theory group of APC) gr-qc
Julien Grain TBA

Wednesday 13 November 2019, 14:15 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires) hep-th
Gim Seng Ng ( Trinity College Dublin ) (TBA)

Monday 18 November 2019, 10:45 at LPTMC, campus Jussieu, tower 13-12, 5th floor, room 523 SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) cond-mat.mes-hall
Owen Benton ( MPIPKS Dresden ) TBA (magnétisme quantique)

Monday 18 November 2019, 14:00 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-STA (Séminaire de Physique Statistique, CEA/Saclay) cond-mat
Robert Jack ( University of Cambridge ) (TBA)

Tuesday 19 November 2019, 11:30 at LPTHE, LPTHE library STR-LPT-ENS-HE (Séminaire commun LPTENS/LPTHE) hep-th
Ida Zadeh ( ICTP ) TBA

Tuesday 19 November 2019, 14:00 at APC, 646A - Mondrian APC-TH (Seminar of the theory group of APC) gr-qc
D. Cutting TBA

Wednesday 20 November 2019, 14:15 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires) hep-th
Simone Giacomelli ( Oxford ) (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)

seminars from series at institute
in subject with field matching

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