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 :
Ecole Polytechnique 
91128 Palaiseau cedex 

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

Write an email to someone at CPHT :  :



Tuesday, March 21 at 14:00

Conference room Laurent Schwartz (CMLS)

Dario Fiore Mosca (CPHT)

Multipolar magnetism in 5d osmate double perovskites

Abstract: The Spin-Orbit Coupling effect plays a crucial role in the correlated electron physics of 5d transition metal oxides, enabling the formation of unique magnetic phases involving high-rank magnetic multipoles. We show that the 5d1 osmate double perovskite Ba2NaOsO6 and 5d2 Ba2MOsO6 (M = Mg, Ca, Zn) are ideal for exploring such physics. They display strong interconnection between the structural, electronic, and magnetic degrees of freedom that gives rise to multipolar interactions, multipolar order, and spin-orbit polarons.



Tuesday, March 14 at 14:00

at CPHT, Conference room Louis Michel

Mihailo Cubrovic (University of Belgrade)

Holography for strange metals from A to B

Abstract: I will discuss selected applications of the holographic duality (AdS/CFT, gauge/gravity duality) in strongly correlated systems, in particular the description of strange metals. After introducing the basic notions of holography on an informal level, I will consider the holographic scaling atlas, semilocal quantum liquids and attempts to describe a strongly coupled holographic Fermi liquid. Toward the end holographic lattices and (if time permits) some relations to quantum chaos will be discussed. The talk is mainly a broad review of holographic strange metals but also includes some recent original results.



The 9th CPHT Young Researchers Seminar will be held on February 24, 2023 at 3:00 p.m. in the Louis Michel Conference Room with two presentations given by :

Pierre Wang (CPHT, CNRS, École Polytechnique) : Triviality of the \varsigma^4_4-theory using the flow equations in the mean-field approximation

Saeed Sadeghi Arjmand (CMLS, CNRS, École Polytechnique) : Minimal-time and potential mean field games with state constraints

The seminar will be followed by a high tea.



Tuesday, February 21 at 14:00 at CPHT,

Conference room Louis Michel

Irenée Frerot (Institute Néel, CNRS, Grenoble)

Bell's inequalities for many-body systems

Abstract : The violation of Bell's inequalities (BI) is a fundamental manifestation of quantum entanglement. Over the recent years, its was progressively recognized that BI allow one to probe fine features of quantum entanglement in many-body systems from minimal assumptions regarding the details of the experimental implementation. I will present the conceptual framework to investigate BI in multipartite systems, as well as the computational challenges associated to the construction of relevant many-body BI. I will present recently-developed approaches, inspired by so-called inverse problems of statistical physics, to overcome this challenge. I will discuss new BI tailored to specific families of quantum many-body states, such as spin-squeezed or spin singlet states. I will conclude by mentioning the self-testing phenomenon, in which the maximal violation of tailored BI allow one to make strong statements on the structure of the prepared quantum state and measurements from minimal assumptions, in a many-body context. Although still delicate for both theory and experiments, the concept of self-testing might become in the future an important tool for the certification of quantum computation devices.


Dario Benedetti will defend his HDR thesis on Tuesday, February 14, at 14:00, in room Louis Michel.

Title: The Melonic Large-N Limit in Quantum Field Theory

Jury members:
Robert de Mello Koch (University of Witwatersrand)
Frank Ferrari (Université Libre de Bruxelles)
Christoph Kopper (Ecole Polytechnique)
Vincent Rivasseau (Univ. Paris-Saclay)
Adrian Tanasa (Univ. Bordeaux) 



Registrations and abstract submissions for the General Congress, 150th anniversary of the French Physical Society (SFP)

Main dates:
From July 3rd to 7th, 2023: General Congress marking the 150th anniversary of the SFP, at the Cité des sciences et de l'industrie in Paris
On July 2nd, from 2pm: Take part in the “Before” event!

The General Congress of the French Physical Society offers, every other year, an updated and multidisciplinary panorama of the latest advances in physics, all fields combined. Lasting for one week, it attracts on average 600 participants, of which 1/3 of PhD students and postdocs.

In 2023, the SFP organizes an exceptional congress to celebrate its 150th anniversary!

website : here


Balt Van Rees, professor at Ecole Polytechnique and member of the Centre for Theoretical Physics, has been awarded an ERC consolidator grant for his QFTinADS project. He will push further a strategy called the “bootstrap”, that aims at better understanding QFTs by exploring very general consistency conditions.

Official announcement on the Ecole Polytechnique website



Since 2019 the Department of Physics and Astronomy at Heidelberg University has been awarding two thesis prizes per year, sponsored by the Wilhelm and Else Heraeus Foundation.

Sabine Harribey is one of the 2022 laureates for her work "Renormalization in tensor field theory and the melonic fixed point," carried out jointly at the École polytechnique (CPHT) and at Heidelberg, under the supervision of D. Benedetti and R. Gurau.

Site officiel