The center for Theoretical Physics (CPHT) at Ecole Polytechnique gathers research scientists working in diverse domains of fundamental and applied Physics. The overall coherence is assured by the corpus of common, transposable, mathematical and numerical methods.
CPHT is a joint research unit of CNRS and Ecole Polytechnique, and has a partnership with the Collège de France. His director is Jean-René Chazottes, Senior Researcher at CNRS.
CPHT is on the campus of Ecole Polytechnique, buildings 5 and 6. The reception offices are located in building 6 , offices 06.1046 and 06.1045.
 

Postal Address :
CPHT 
Ecole Polytechnique 
91128 Palaiseau cedex 
France

Secretary phone number : 01 69 33 42 01 (from abroad: +33 169 334 201)

Write an email to someone at CPHT :  : firstname.lastname@polytechnique.edu

 

Charles Marteau is an alumnus of the École Normale Supérieure de Cachan. He studied theoretical physics at the master's degree of the École Normale Supérieure de Paris and fundamental mathematics at the master's degree of Sorbonne University. He joined the string theory group in fall 2017, as a PhD student under the supervision of Marios Petropoulos, on the topic Boundary structures and holographic fluids in gravity.

The arrival of Charles Marteau in the team coincided with the launching of a new research area, holographic correspondence gravity / gauge theory in asymptotically flat space-time, in which another student, Luca Ciambelli, was involved. Together, they clarified the structure underlying the fluid/gravity version of flat holography, namely Carrollian fluid dynamics, an ultra-relativistic version of hydrodynamics. Thanks to this fruitful collaboration, Charles Marteau pursued his thesis in many directions. The main advances of his work can be summarized as follows: (i) the extension of the fluid/gravity correspondence to the flat case which required the ab initio design of Carrollian hydrodynamics; (ii) an exhaustive investigation of three-dimensional gravity and its applications in two-dimensional fluids; (iii) finally the application of Carrollian concepts to the study of the black-hole horizon dynamics.

During his PhD time, Charles Marteau made several long visits abroad, in Europe and in the US, during which he developed his own collaborations with other doctoral and post-doctoral fellows. The extent of the work accomplished as well as his independence as a young researcher can be measured in his publication list: nine articles, four of which were written without his thesis director and signed with a young collaborator. His dissertation is a collection of his first seven papers, put in perspective by an introductory text which allows to set up the framework and to introduce the general notions of asymptotic symmetries and Carrollian geometry.

Charles Marteau is currently a post-doctoral researcher at the University of British Columbia in Vancouver, where he continues his activities in the group of Gordon Semenoff.

English

 

Louis Villa soutiendra publiquement ses travaux de thèse intitulés

"Out-of-equilibrium dynamics and quench spectroscopy of ultracold many-body quantum systems"

le 9 juillet 2021 à 14h00 au CPHT, Salle de conférence Louis Michel.

Thèse de doctorat de l’Institut Polytechnique de Paris préparée à l’Ecole Polytechnique, au Centre de Physique Théorique (groupe Matière condensée).

Composition du Jury :

- David Clément, Maître de Conférences, Institut d’Optique Graduate School (Laboratoire Charles Fabry), Rapporteur
- Nicolas Pavloff, Professeur, Université Paris-Saclay (Laboratoire de Physique Théorique et Modèles Statistiques), Rapporteur
- Gabriele De Chiara, Reader, Queen’s University of Belfast (Centre for Theoretical Atomic, Molecular and Optical Physics), Examinateur
- Luca Tagliacozzo, Ramon y Cajal Fellow, Universitat de Barcelona (Departamento de Fisica Cuantica i Astrofisica), Examinateur
- Patrizia Vignolo, Professeure, Université de Nice-Sophia Antipolis (Institut Non-Linéaire de Nice), Examinatrice
- Laurent Sanchez-Palencia, Directeur de recherche, Ecole Polytechnique (Centre de Physique Théorique), Directeur de thèse

Résumé de la thèse / Abstract

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La « Nuit des Temps » est une manifestation grand public organisée conjointement par la Société Française de Physique, le CNRS et le CEA et en partenariat avec la Société Française d’Optique, la Société Chimique de France et la revue "Sciences & Avenir".

Plus d'informations : Accueil

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Jordan Moles (groupe Physique Mathématique)

Soutiendra publiquement ses travaux de thèse intitulés

"On concentration inequalities for equilibrium states in lattice and symbolic dynamical systems"

dirigés par Jean-René Chazottes et Edgardo Ugalde

Soutenance prévue le vendredi 18 décembre 2020 à 14h00 en visioconférence

Jury :

- Sandro Vaienti, rapporteur et examinateur, Aix-Marseille Université

- Aernout van Enter, université de Groningen, Pays-Bas, rapporteur et examinateur

- Frank Redig, université de Delft, Pays-Bas, examinateur

- Sandro Gallo, université de São Carlos, Brésil, examinateur

- Edgardo Ugalde, université de San Luis Potosí, Mexique, co-directeur de la thèse

- Jean-René Chazottes, CPHT, co-directeur de la thèse

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Cédric Lorcé, enseignant-chercheur au Centre de Physique Théorique,  lauréat du prix Thibaud 2020.

Le Prix Thibaud, attribué par l'Académie des sciences, belles-lettres et arts de Lyon, distingue tous les 2 ans deux jeunes chercheurs, expérimentateurs ou théoriciens qui se sont particulièrement illustrés dans le domaine de la physique du noyau atomique, des particules ou des astroparticules. Il s'agit d'un prix européen. Le prix est nommé en référence à Jean Thibaud, physicien nucléaire et fondateur de l'Institut de physique nucléaire de Lyon.

Les recherches de Cédric Lorcé portent sur l'étude de la structure des protons et des neutrons en termes de quarks et de gluons. Plus d'informations : Communiqué de presse de l'Académie

Annonce des résultats
Liste des lauréats du Prix Thibaud de 1963 à 2018 
Modalités du prix 
 

 

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Post Doctoral Fellow

Research group: String Theory 

Research interests :

My work concerns infinite-dimensional symmetries (and more generally group actions) that appear in various domains of physics. This includes asymptotic symmetries in gravitation and gauge theory, but also condensed matter physics (e.g. the quantum Hall effect) and fluid mechanics. Indeed, all these systems admit rich underlying group structures, with typically striking implications, whose study is often hampered by the complexity of infinite-dimensional manifolds. My goal is to unveil the physical, possibly observable, effects of these groups, for instance through certain Berry phases that are associated with them.

"It is only slightly overstating the case to say that physics is the study of symmetry."
[Philip W. Anderson, "More is different", Science, 1972]

Thesis:

"BMS Particles in Three Dimensions", Université Libre de Bruxelles, 2016.
arXiv:1610.08526
Published in Springer Theses:  https://www.springer.com/gp/book/9783319618777

Publications:

List of publications can be found on Inspire : https://inspirehep.net/authors/1626583

Selection of publications:

- B. Oblak and G. Kozyreff, “Berry Phases in the Reconstructed KdV Equation,” arXiv:2002.01780.

- B. Oblak, “Berry Phases on Virasoro Orbits,” JHEP 10 (2017) 114, arXiv:1703.06142.

- G. Barnich, H. A. Gonzalez, A. Maloney, and B. Oblak, “One loop partition function of three- dimensional flat gravity,” JHEP 2015 (2015), no. 4, arXiv:1502.06185.

- B. Oblak, “Characters of the BMS Group in Three Dimensions,” Commun. Math. Phys. 340 (2015), no. 1, 413-432, arXiv:1502.03108.

- G. Barnich and B. Oblak, “Notes on the BMS group in three dimensions: I. Induced representations,” JHEP 2014 (2014), no. 6, arXiv:1403.5803.

 

Address CPHT, Ecole Polytechnique, 91128 Palaiseau cedex, France
Phone 33 (0) 1 69 33 42 71
Contact firstname.lastname@polytechnique.edu
Office Aile zéro, pièce 1026

 

English

 

Hepeng Yao (groupe Matière condensée)

Soutiendra publiquement ses travaux de thèse intitulés


"Strongly-correlated one-dimensional bosons in continuous and quasiperiodic potentials"

dirigés par Laurent Sanchez-Palencia

Soutenance prévue le mardi 20 Octobre 2020 à 14h00

Lieu : viso conférence via zoom (https://us02web.zoom.us/j/83369858239?pwd=MXBybjV1MmJRNFNIR1pvSnpMZ25MZz09)

Abstract

We investigate the properties of one-dimensional bosons in various types of systems, focusing on the phase transitions or crossovers between different quantum degeneracy regimes. Combining quantum Monte Carlo with other standard techniques such as exact diagonalization and thermal Bethe ansatz, we can compute the behavior of 1D bosons in different cases where the results are still lacking. First, in the case of harmonically trapped continuous bosons, we provide a full characterization of a quantity called Tan's contact. We show that the contact exhibits a maximum versus temperature and that it is a signature of the crossover to fermionization in the strongly-interacting regime. Secondly, we study the localization and fractal properties of 1D ideal gases in shallow quasiperiodic potentials. We determine the critical localization properties of the system, the critical potential, mobility edges and critical exponents which are universal. Moreover, we calculate the fractal dimension of the energy spectrum and find it is non-universal but always smaller than unity, which shows the spectrum is nowhere dense. Finally, we move to the study of the interacting case. With the quantum Monte Carlo calculations, we compute the phase diagram of Lieb-Liniger bosons in shallow quasiperiodic potentials. A Bose glass, surrounded by superfluid and Mott phases, is found. At finite temperature, we show that the melting of the Mott lobes is characteristic of a fractal structure and find that the Bose glass is robust against thermal fluctuations up to temperatures accessible in experiments.

Jury

Rapporteurs:
Guillaume Roux (Université Paris-Saclay)
Ulrich Schneider (University of Cambridge)

Examinateurs :
Thierry Giamarchi (University of Geneva)
Anna Minguzzi (Université Grenoble Alpes)
Hanns-Christoph Nägerl (University of Innsbruck)

Directeur de thèse :
Laurent Sanchez-Palencia (CPHT, Ecole Polytechnique)

 

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