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 on the campus of Ecole Polytechnique, buildings 5 and 6. The reception offices are located in "building 6" , offices 06.1046 and 06.1045.
How to visit us 
The CPHT is formally divided into six groups:


Ecole Polytechnique 
91128 Palaiseau cedex 

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

Fax number : 01 69 33 49 49 (from abroad: +33 169 334 201)

Write an email to someone at CPHT :  :



PhD thesis Defense:

Alexander Efremov
(Mathematical Physics)

"Renormalization of SU(2) Yang-Mills theory with flow equations"

Wednesday, September  27th at 3:00pm, Room conference, CPHT, Building 6

Abstract: The problem of perturbative renormalization of SU(2) Yang-Mills theory is studied in four dimensional Euclidean space with Lorenz gauge fixing. The analysis is based on the renormalization group flow equations. This is a unified approach which permits to study a large class of field theories without recourse to Feynman diagrams. It is remarkable that the flow equations allow us to construct all vertex functions of the theory using only the renormalization conditions. An important part of the work consists in establishing upper bounds in momentum space on all vertex functions at all loop orders. These bounds have a very natural graphical interpretation in form of trees. In order to properly define the vertex functions one must introduce ultraviolet and infrared cut-offs. But this regularization breaks BRST invariance. Thus it is essential to prove at all loop orders that the construction can be accomplished in such a way that BRST invariance is restored when the UV cut-off goes to infinity. Furthermore, substantial effort is made to provide a physical renormalization scheme which is explicitly independent of the flow parameter.


PhD Defense at CPHT :

Pascal Delange 
(Condensed Matter)

"Many-electron effects in transition metal and rare earth compounds: Electronic structure, magnetic properties and point defects from first principles"

Friday, september 29th 11:00 AM, Amphi Becquerel, Ecole Polytechnique

Abstrac : The structural, spectral, magnetic, and many other properties of materials are mostly determined by the behavior of the electrons that glue the atoms together.

Some of the most important technological advances of the 20th century were made in the field of semi-conductors, where electrons behave like a dilute gas of weakly interacting particles. In contrast, many of the most promising materials for technological applications today are oxides. In transition metal or rare earth oxides, but also in some pure metals or alloys, the Coulomb repulsion between the electrons can give rise to exotic properties and phase transitions.

In this thesis, we developed and applied first-principles (i.e. based on fundamental laws of physics) methods to evaluate the behavior of electrons interacting with each other and the physical properties stemming from it. We use these tools to study several materials of fundamental and technological interest, in particular iron, vanadium dioxide and hard magnets.


The Simons Foundation (New York City) is delighted to announce the formation of the Center for Computational Quantum Physics (CCQ), in the foundation’s new Flatiron Institute, and the appointment of Antoine Georges as its director.

More details :


Registration open !

"School on UV- and X-ray spectroscopies of correlated electron systems" (SUCCESS)

September 4-15 2017, Les Houches, French Alps

Strong electronic correlations lead to a rich variety of exotic states of matter. The most direct approach to understand these systems is to study their microscopic electronic structure. This School will introduce the recent experimental and theoretical developments in ultra-violet and X-ray spectroscopies, from their basic unifying principles to their applications in the study of correlated electron systems. It addresses graduate students (Master and PhD) and young researchers (postdocs and junior academics) working in the field. For details and registration, see:


Le prix Langevin de la SFP est destiné à récompenser un(e) physicien(ne) en milieu de carrière pour un travail de fond en physique théorique. Pour l'année 2016, il récompense deux chercheurs dans la thématique "Physique de la matière condensée, physique statistique, physique et vivant" dont Silke Biermann du Centre de Physique Théorique de l'Ecole Polytechnique.
En savoir plus :


Antoine Georges, Professeur à l'Ecole polytechnique et au Collège de France a été nommé Chevalier de la Légion d'honneur.
Antoine Georges, ancien élève de l'Ecole (X1980) est spécialiste de la physique théorique de la matière condensée. Il est  responsable de l'équipe Matière condensée au Centre de Physique Théorique de l'Ecole Polytechnique
Ses percées dans la théorie des électrons fortement corrélés ont été récompensées par de nombreux prix et distinctions prestigieux, nationaux et internationaux.


Antoine Georges, Professeur au Collège de France et chercheur au Centre de Physique Théorique de l'Ecole Polytechnique a reçu une bourse Synergie par le Conseil Européen de la Recherche en 2012.
Le projet "Frontiers in Quantum Materials Control" (QMAC) réunit Andrea Cavalleri (Institut Max Planck, Hamburg), Antoine Georges (CPHT-Ecole Polytechnique et Collège de France) Dieter Jaksch (Université d'Oxford) et Jean-Marc Triscone (Université de Genève).


Silke Biermann, Professeur chargée de cours et chercheuse au Centre de Physique Théorique à l’École polytechnique, a reçu une bourse d’excellence européenne du Conseil Européen de la Recherche. Elle a été primée dans la catégorie Consolidator Grant (ERC 2013), pour ses travaux de recherche sur les systèmes à fortes corrélations électroniques.

Nom du projet : ERC CORRELMAT "Predictive electronic structure calculations for materials with strong electronic correlations: long-range Coulomb interactions and many-body screening"