Institut de Physique Théorique
Direction de la Recherche Fondamentale  -  Saclay
UMR 3681 - INP
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Monday, August 20, 2018

Welcome to IPhT



Monday, Sep 03, 2018

14h00 Séminaire SCOPI Paris-Saclay

Séminaire SCOPI Paris-Saclay

Orme des Merisiers - Amphi Claude Bloch, Bât. 774 Orme des Merisiers


The Institut de Physique Théorique (IPhT) is a laboratory of fundamental research, located in Saclay, about 20 km south-west of Paris.

The research performed at the IPhT aims at better understanding the laws which govern our universe and its organisation. It encompasses most of the great subjects of modern theoretical physics:

The IPhT comprises about fifty permanent physicists (2/3 CEA, 1/3 CNRS), about thirty PhD students and postdocs, assisted by a support staff of about ten people. The IPhT also hosts permanently many short term visitors.


Lenka Zdeborová and Marc Barthélemy in La Recherche !   
imgThe popular-science magazine "La Recherche" presents this month (vol 537-538, July-August 2018) a special issue devoted to complex systems in which our Institute is well represented. Among the articles, Lenka Zdeborová and Florent Krzakala discuss statistical physics approach to extract relevant information from large datasets, and Marc Barthelemy presents physical approaches to model urban systems.
C. Pepin, 2018-07-10


Beyond Amplitudes’ Positivity and the Fate of Massive Gravity   
imgThe idea that physics at low energy, i.e. large distances, can be described in terms of light degrees of freedom alone is one of the most satisfactory organizing principle in physics, which goes under the name of Effective Field Theory (EFT). The effect of short-distance ultraviolet (UV) dynamics is systematically accounted for in the resulting infrared (IR) EFT by integrating out the heavy degrees of freedom, which generate an EFT built of infinitely many local operators. Yet, EFT’s are predictive even when the UV dynamics is unknown, because in practice only a finite number of operators contributes, at a given accuracy, to observable quantities. The higher the operator dimension, the smaller the effect at low energy.

Remarkably enough, extra information about the UV can always be extracted if the underlying Lorentz invariant microscopic theory is unitary, causal and local. These principles are encoded in the fundamental properties of the S-matrix such as unitarity, ...

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C. Pepin, 2018-05-17


L’universalité des matrices aléatoires: un article de Bertrand Eynard dans Pour la science   

img"L'énigme des matrices aléatoires", un article paru dans Pour la Science (mai 2018) sur les Matrices Aléatoires, par Bertrand Eynard, physicien à l'IPhT. Bertrand est depuis de nombreuses années un spécialiste des matrices aléatoires, sujet qu'il a enseigné à plusieurs reprises, en master et dans des Ecoles Doctorales, comme celle des Houches. 

Les lois des matrices aléatoires sont des lois statistiques universelles que l'on retrouve partout : que ce soit dans les temps d'attente des bus et des métros, les voitures garées le long d'un trottoir, les arbres d'une forêt, les neurones, la bourse, les antennes de téléphonie mobile, mais aussi les résonances des noyaux atomiques, la théorie des cordes, la chromodynamique quantique, et même les  nombres premiers... Leur étude mathématique est fascinante, les ...

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F. David, 2018-05-16


"Trous de ver, la porte des étoiles": écouter Monica Guica sur Radio France

Topological phases of matter: from the quantum Hall effect to spin liquids (June 11th - July 6th, 2018)

Nick Warner awarded an ERC Advanced grant to work at IPhT

"Morphogenesis of Spatial Networks": a book by Marc Barthelemy

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