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

Monday, January 30 at 14:00 at CPHT,

Conference room Louis Michel

Blaise Goutéraux (CPHT, Ecole Polytechnique)

Hydrodynamic applications for strongly-correlated Condensed Matter systems

Abstract : here

The 8th CPHT Young Researchers Seminar will be held on February 10, 2023 at 3:00 p.m. in the Louis Michel Conference Room with two presentations given by :

Adrien Loty (CPHT, CNRS, École Polytechnique) : Constraints on Maximally Supersymmetric String Theories

Adrián Gómez Pueyo (CPHT, CNRS, École Polytechnique) : Nonlinear Phononics: (Transiently) Breaking the Symmetry of a Crystal

The seminar will be followed by a high tea.

CPHT Condensed Matter seminar

Tuesday, January 17 at 14:00

at CPHT, Conference room Louis Michel

Olesia Dmytruk (CNRS, CPHT, Ecole Polytechnique)

Probing and controlling topological phases of matter with light

More information : here