Résumé / Abstract Seminaire_GReCO

"Cosmology and GR limit of Horava-Lifshitz gravity"

Shinji Mukohyama
Institute for the Physics and Mathematics of the Universe, Univ Tokyo (Tokyo, Japon)

In the first half of the talk I will discuss cosmological implications of a power-counting renormalizable theory of gravitation recently proposed by Horava. I explain that (i) the anisotropic scaling with the dynamical critical exponent z=3 solves the horizon problem and leads to scale-invariant cosmological perturbations even without inflation; and that (ii) at low energy this theory does not exactly recover general relativity but instead mimic general relativity plus dark matter. In the latter half I will discuss the fate of an extra scalar degree of freedom called scalar graviton. In particular, I show a couple of examples in which the system exhibits an analogue of Vainshtein effect so that the general relativity (plus dark matter) limit is continuous.

lundi 21 mai 2012 - 11:00
Salle des séminaires François Arago ,
Institut d'Astrophysique de Paris

Page web du séminaire / Seminar's webpage