Institut de Physique Théorique
Direction des Sciences de la Matière  - CEA-Saclay
Unité de Recherche Associée au CNRS
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Monday, March 30, 2015

Welcome to IPhT




11h00 Séminaire de physique mathématique

Séminaire de physique mathématique

Salle Claude Itzykson, Bât. 774 Orme des Merisiers

J.S. Caux

14h00 Séminaire de physique statistique

Séminaire de physique statistique

Salle Claude Itzykson, Bât. 774 Orme des Merisiers

Darius Sadri

Tuesday, Mar 31, 2015

14h15 Séminaire de matrices, cordes et géométries aléatoires

Séminaire de matrices, cordes et géométries aléatoires

Salle Claude Itzykson, Bât. 774 Orme des Merisiers

Mirela Babalic

Friday, Apr 03, 2015

10h00 Cours de physique théorique

Cours de physique théorique

Salle Claude Itzykson, Bât. 774 Orme des Merisiers

Filippo Vernizzi

Tuesday, Apr 07, 2015

11h00 Séminaire de vulgarisation

Séminaire de vulgarisation

Salle Claude Itzykson, Bât. 774 Orme des Merisiers

Kirone Mallick

Wednesday, Apr 08, 2015

14h15 Séminaire hadronique et des particules

Séminaire hadronique et des particules

Salle Claude Itzykson, Bât. 774 Orme des Merisiers

Federico Piazza

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.


Liouville Quantum Gravity on the Riemann Sphere   

imgIn 1981, the famous theoretician A. Polyakov introduced the quantum Liouville theory as a model for the quantized string. This theory “quantizes” the Liouville equation R=-1 of classical geometry, which characterizes Riemann surfaces with negative curvature. It is thus a quantum theory of gravity, where the geometry of a two dimensional space-time in quantized (1 time dimension + 1 space dimension).

Liouville theory has remarkable properties. It is a conformal theory (it is endowed with an infinite symmetry group, the same as for string theories and critical systems such as the Ising model in two dimensions). Liouville theory appears, sometimes unexpectedly, in many problems of theoretical physics and of pure mathematics. It has been therefore very much studied via the methods of Conformal Field Theory and of Integrable Systems. But it is also related, in a deep but still partially understood way, to combinatorial models where space-time is discretized as a random lattice (random maps, matrix models). In these two approaches (continuous and discrete) the IPhT has brought major contributions.

Recently a third player entered this arena: probability theory! It already led to a better ...

More »

C. Pepin, 2015-02-24


20ème conférence Itzykson, Surfaces et géométries aléatoires, 10-12 juin 2015   

imgThe 20th Itzykson Conference will be held at the Institute of Theoretical Physics in Saclay from June 10 to 12, 2015. This annual conference, honouring the memory of the famous theoretical physicist Claude Itzykson, will be devoted this year to Random Surfaces and Random Geometry and will cover the following topics :
 - random maps, random surfaces and Liouville theory,
 - random geometries in higher dimensions, quantum gravity and string theory,
 - random geometries in condensed matter and biophysics, complex systems and social sciences.

The list of speakers, registration form, and further practical information, are available on the webpage :

Looking forward to seeing you in Saclay in June,

  The organizers, Jérémie Bouttier, François David and Bertrand Eynard

F. David, 2015-02-20


A new, yet faster, version of FastJet   


Quarks and gluons are abundantly produced in the final state of the LHC collisions. They are observed as collimated showers of particles, known as jets. Jets are crucial objects in particle physics, used e.g. in about 60% of the LHC analyses. 

In practice, jets need to be reconstructed from the particles in the final state using a jet algorithm (the anti-kt algorithm [1] at the LHC). This, as well as all sorts of manipulations on jets --- e.g. calculating their area, subtracting soft contamination or studying their internal (sub)structure --- is done numerically. FastJet [2], developed by Matteo Cacciari, Gavin Salam and Gregory Soyez, is the computer interface used by the high-energy community to perform this fundamental task. 

With hundreds of events recorded every second at the LHC, time is of the essence. For event reconstruction at the LHC, jet clustering is the second most time-consuming step (right after reconstructing ...

More »

P. Brax, 2015-02-03


Uncovering the spatial structure of mobility networks

Spin Vertex and 3 Point Function in AdS/CFT Correspondence

Hélène Dupuy receives a "L'Oréal - UNESCO for women in science" fellowship

Roger Balian and François David interviewed on quantum physics

Robi Peschanski on air on France Culture

Marco Cirelli awarded the Thibaud Prize of the académie de Lyon

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