Today
10h00 Cours de physique théorique de Saclay
Cours de physique théorique de Saclay
Orme des Merisiers  Salle Claude Itzykson, Bât. 774 Orme des Merisiers
Adam Falkowski
14h00 Séminaire de physique des particules et de cosmologie
Séminaire de physique des particules et de cosmologie
Orme des Merisiers  Salle Claude Itzykson, Bât. 774 Orme des Merisiers
Andrzej Czarnecki
Wednesday, May 03, 2017
14h15 Séminaire de matrices, cordes et géométries aléatoires
Séminaire de matrices, cordes et géométries aléatoires
Orme des Merisiers  Salle Claude Itzykson, Bât. 774 Orme des Merisiers
Charles StricklandConstable
Friday, May 05, 2017
10h00 Cours de physique théorique de Saclay
Cours de physique théorique de Saclay
Orme des Merisiers  Salle Claude Itzykson, Bât. 774 Orme des Merisiers
Adam Falkowski
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.
A particle in a onedimensional channel with excluded volume interaction displays anomalous singlefile diffusion with fluctuations scaling as t^(1/4) in the long time limit. This phenomenon has been demonstrated in various experiments involving different types of physical systems such as zeolites, capillary pores, carbon nanotubes or colloids. On a one dimensional lattice, the Symmetric Exclusion Process, particles performing symmetric random walks and interacting by hardcore exclusion, is a pristine model of a singlefile diffusion, amenable to quantitative analysis (Spitzer, 1970). At equilibrium, the variance of the position of a tagged particle has been calculated exactly by Arratia in 1983, and this result has been discussed since then in numerous theoretical papers, at various levels of physical intuition or mathematical rigor. However, the full distribution of a tagged particle and its higher cumulants (prone to experimental measurements) are not known. A rigorous work by S. Sethuraman et S. R. S. ... 

J. Luck, 20170420

It was with great sadness that we learned of the death of Cirano de Dominicis on April 4, 2017, at the age of 90 years. Cirano de Dominicis, a former student of École polytechnique and of Ecole des Mines, spent his entire career at the Atomic Energy Commission, where he participated in the founding of the theoretical physics group at Saclay. An outstanding scientist, his innovative work had profoundly influence on the fields of condensed matter physics, of the Nbody problem, and later on the physics of disordered systems and spi glasses. He was Director of the Saclay theory group (then Service de Physique Théorique) from 1971 to 1979. He has been President of the French Society of Physics, and was the recipient of the Paul Langevin and Ricard Prizes of the French Society of Physics and of the CNRS Silver Medal. He continued his research activities at the Institute and to be involved in scientific life with impressive energy, until ... 

F. David, 20170406

The standard model of particle physics arises in string theory from open strings ending on membranes (Dbranes) extended along the threedimensional space. Closed strings propagating along the whole tendimensional world of string theory play the role of the hidden sector, communicating to the matter sector the breaking of supersymmetry that takes place in the extra dimensions in the form of “soft terms” (which have this name because they break supersymmetry without causing ultraviolet divergences).
However, not any softsupersymmetrybreaking Lagrangian can be obtained this way since the string theory equations of motion and consistency conditions impose relations between the soft couplings. Iosif Bena, Mariana Graña and collaborators have shown that for models realized on D3branes the trace of the square of the boson mass matrix is equal to the trace of the square of the fermion mass matrix at tree level, and this equality holds at least up to two loops [1]. String theory thus dictates ... 

C. Pepin, 20170322

Ecole de Physique: "Exact methods in lowdimensional statistical Physics"
Nonunitary ``Quantum mechanics''
Conference about the origins of Gravity
22ème conférence Itzykson, manipulation of simple quantum systems, June 68 2017
Beg Rohu 2017 "Out of Equilibrium Dynamics, Evolution and Genetics"
¨Le Monde¨ 2016 Research Prize for Rémi Louf
2016 Philippe Meyer Prize in Theoretical Physics for Lenka Zdeborova
2016 Thibaud Prize for Gregory Soyez
Abragam prize of the National Academy of Sciences for Cristina Bena
Duncan Haldane, Nobel laureate in Physics in 2016, was a visitor at IPhT