A unifying approach to dark energy and modified gravity
David Langlois
APC, Université Paris Diderot
Tue, Mar. 15th 2016, 11:00
Salle Claude Itzykson, Bât. 774, Orme des Merisiers

After an introduction summarising the current status of the standard cosmological model, this talk will present an effective description of dark energy and modified gravity models involving a single scalar field. It is based on a 3+1 splitting of space-time with respect to uniform scalar field hypersurfaces. The advantage of this approach is that it describes, in the same language, a vast number of existing models, such as quintessence, F(R) gravity, Horndeski theories. It also applies to the recent scalar-tensor theories ``beyond Horndeski'', which I will also discuss. In summary, this approach provides a unified treatment of linear cosmological perturbations, generically characterized by a few time-dependent functions. This gives an economic and systematic way to confront theoretical models with cosmological observations.

Contact : Francois DAVID


Retour en haut