Institut de Physique Théorique
Direction de la Recherche Fondamentale  -  Saclay
UMR 3681 - INP
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Tuesday, March 28, 2017

Welcome to IPhT

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Agenda

Today

11h00 Séminaire de vulgarisation

Séminaire de vulgarisation

Orme des Merisiers - Salle Claude Itzykson, Bât. 774 Orme des Merisiers

Jean-Yves Ollitrault

Wednesday, Mar 29, 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

Andreas Braun

Thursday, Mar 30, 2017

11h00 Séminaire de physique statistique

Séminaire de physique statistique

Orme des Merisiers - Salle Claude Itzykson, Bât. 774 Orme des Merisiers

Arijeet Pal

Friday, Mar 31, 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

John Joseph Carrasco

Wednesday, Apr 05, 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

Robin Terrisse


more...
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.

News

String Theory D3-brane constructions of physics beyond the Standard Model ruled out by the LHC   
imgThe standard model of particle physics arises in string theory from open strings ending on membranes (D-branes) extended along the three-dimensional space. Closed strings propagating along the whole ten-dimensional 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 soft-supersymmetry-breaking 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 D3-branes 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 ...

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C. Pepin, 2017-03-22

 

Ecole de Physique: "Exact methods in low-dimensional statistical Physics"   

imgBertrand Duplantier, Ivan Kostov, Stéphane Ouvry, Vincent Pasquier, Hubert Saleur, Didina Serban, et Jonathan Belletête organisent une école d'été à Cargèse du 24 juillet au 4 août 2017. Vous trouverez toutes les informations sur le site:
https://indico.in2p3.fr/event/14018/
N'hésitez pas à vous inscrire!
 

V. Pasquier, 2017-03-13

 

Non-unitary ``Quantum mechanics''   
img

Unitarity - which guarantees in particular that the probabilities of all possible events add up to one -
is one of the pillars of quantum mechanics.
In the last few years however, several fundamental problems have seen important new progress thanks to a description in terms of ``non-unitary quantum mechanics". These problems typically involve non-local geometrical aspects, or strong disorder. Two well known examples are percolation, and the model describing the localization/delocalization transition between plateaux in the integer quantum Hall effect. In both cases, the loss of unitarity is the price to pay to use a local field theoretic description for a problem which is initially non local (like percolation), or involves average over disorder.

The loss of unitarity has profound consequences: even if probabilities still add up to one, some probabilities can now be negative, or events whose probability vanishes cannot be discarded any longer. Luckily, these difficulties are compensated by ...

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C. Pepin, 2017-03-08

 

Conference about the origins of Gravity

22ème conférence Itzykson, manipulation of simple quantum systems, June 6-8 2017

Beg Rohu 2017 "Out of Equilibrium Dynamics, Evolution and Genetics"

Succession of the IPhT's Head

¨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


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