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
Bertrand Eynard
Tuesday, Jan 23, 2018
16h00 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
Brando Bellazzini
Wednesday, Jan 24, 2018
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
Juan Diaz Dorronsoro
Friday, Jan 26, 2018
10h00 Cours de physique théorique de Saclay
Cours de physique théorique de Saclay
Orme des Merisiers  Salle Claude Itzykson, Bât. 774 Orme des Merisiers
Bertrand Eynard
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.
Mariana Graña of IPhT has been awarded an ERC consolidator grant for her project "Deconstructing the string landscape". Congratulations Mariana ! Despite its uniqueness, string theory has a “landscape” of effective partly phenomenological lowenergy solutions with very different observable physics. The objective of her project is to "deconstruct" this landscape, and determine what parts of it can be promoted to consistent fullfledged string theory solutions, and what parts are inconsistent. It aims at understanding if the present geometrical landscape paradigm can be put on solid ground, or if more inventive alternatives such as “nongeometric landscape” have to be searched. 

F. David, 20180103

The recent observation of gravitational waves from a neutron star binary inspiral by LIGO/Virgo and its electromagnetic counterpart in the form of a gammaray burst implies that gravitational waves travel at the speed of light, with deviations smaller than a part over million billions. Two Letters, one by Filippo Vernizzi (IPhT) and the other by Miguel Zumalaccaregui (currently MSCA fellow at BCCP Berkeley and IPhT), recently published in Physical Review Letters and chosen for the Editors' Suggestion, show dramatic consequences of this experimental result for models of dark energy and modified gravity. In some of these theories, dark energy acts as a refractive media for the propagation of gravity and a large class of them is ruled by this observation. The papers explore the implications for many known models and present the most general scalartensor theory leaving the speed of gravity unaffected. These two articles have been inspired by the many stimulating discussions at the DARK ... 

F. David, 20180103

Dark Energy and ModifiedGravity cosmologies: DARKMOD from September 11, 2017 to October 6, 2017 The acceleration of the expansion of the Universe at low redshifts has not received a satisfactory theoretical explanation yet. The value of a possible cosmological constant remains a puzzle and alternative approaches, dark energy or modified gravity, are still being developed. In view of the future observations by galaxy surveys, such as EUCLID for instance, it is timely to gather experts on both the theoretical aspects of dark energy and modified gravity, together with phenomenologists and observers. This 4week workshop will provide an opportunity to discuss most aspects of both dark energy and modified gravity, from their theoretical construction to their link with observational cosmology. 

F. David, 20170808

¨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