Institut de Physique Théorique
Direction des Sciences de la Matière  - CEA-Saclay
Unité de Recherche Associée au CNRS
encart droite
Encart de droite, peut être utilisé à des fins diverses. Actuellement caché via les CSS.
Tuesday, October 06, 2015

Welcome to IPhT



Friday, Oct 09, 2015

10h00 Cours de physique théorique

Cours de physique théorique

Salle Claude Itzykson, Bât. 774 Orme des Merisiers

Sheer El-Showk and Miguel Paulos

Monday, Oct 12, 2015

11h00 Séminaire de physique mathématique

Séminaire de physique mathématique

Salle Claude Itzykson, Bât. 774 Orme des Merisiers

Semyon Klevstov

Tuesday, Oct 13, 2015

11h00 Séminaire général de l'IPhT

Séminaire général de l'IPhT

Salle Claude Itzykson, Bât. 774 Orme des Merisiers


Thursday, Oct 15, 2015

14h15 Groupe de travail

Groupe de travail

Salle Claude Itzykson, Bât. 774 Orme des Merisiers

Jean-Marc Luck

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.


Conference "de Sitter and microstate lansdscapes in string theory"   

imgThe conference "de Sitter and microstate lansdscapes in string theory" took place at IPhT from June 16 to 19, 2015. This workshop gathered 70 participants from around the world to discuss recent advances in understanding the landscapes of de Sitter spaces in string theory on one hand, and of black hole microstate geometries on the other. Both landscapes have experienced quite intense recent remodeling: on the black hole side this was driven by “fuzzball/firewall” information-theory-based arguments that black hole solutions are only thermodynamic approximations that stop describing the physics at the scale of the horizon, where they should be replaced by horizonless geometries dual to the black hole microstates, and on the cosmology side by the realization that antibranes, which are one of the key ingredients needed to obtain a landscape of de Sitter vacua, may give rise to instabilities. 

F. David, 2015-07-03


Bending of Light in Quantum Gravity   

imgA century ago Albert Einstein used his new theory of gravity – the general relativity - for evaluating the bending angle of rays of light under the gravitational pull from the Sun. Ludovic Planté, Pierre Vanhove and their colleagues have evaluated for the first time the quantum gravity correction to this bending angle.

The computation is done in the framework of the low-energy effective field theory, which allows evaluating large distance effects by keeping only low energy fields and couplings. This contribution is universal to any theory of quantum because since it is independent of (any unknown) high-energy degrees of freedom.

The quantum correction depends on the spin of the deflected massless particle, in contrast to the classical contribution. Therefore it violates the equivalence principle but preserves the fundamental symmetries of the theory on which Einstein based his theory of general relativity.

"Bending of Light in Quantum Gravity", N. E. J. Bjerrum-Bohr, John F. Donoghue, Barry R. ...

More »

C. Pepin, 2015-04-08


RNA: The unknotted strands of life   

img No one had checked before, but RNA, the nucleic acid involved in many cell functions including protein synthesis, appears to be the only « strand of life » not to have knots.

Over the years, advances in structural biology have firmly established that both proteins and DNA, although subject to evolutionary selection, do not escape the statistical law whereby a sufficiently long and compacted molecular strand will inevitably be entangled. However, no one to date had looked into the case of RNA.

Using the structural description provided for approximately 6,000 RNA chains entered in the Protein Data Bank, a team of researchers from the SISSA (Italy) and the IPhT has performed a thorough study of the presence of knots in these biopolymers.

In order to detect knots, they used the following methods:

  1. Circularize the RNA chain by joining its extremities using the « minimally invasive » scheme
  2. Simplify locally the structure by iteratively removing obviously unknotted parts
  3. Compute the Alexander determinants, and for more ...

    More »

F. David, 2015-04-08


Spin Vertex and 3 Point Function in AdS/CFT Correspondence

Retour en haut