Résumé / Abstract Seminaire_GReCO

"Aspects of Horava-Lifshitz cosmology"

Emmanuel N. Saridakis
Physics Division, National Technical Univ. Athens (Athènes, Grèce)

We investigate cosmological scenarios in a universe governed by Horava-Lifshitz gravity, with or without the detailed-balance condition. In particular, we study the dark energy dynamics, the bouncing solutions and the cyclic behavior, and we perform a phase-space analysis examining the late-time cosmological evolution. Furthermore, we use observational data in order to constrain the parameters of the theory, and additionally we discuss some thermodynamic aspects of Horava-Lifshitz cosmology. Additionally, in the context of Horava-Lifshitz gravity we present a possible explanation for neutrino superluminality claimed by OPERA collaboration. Although this analysis indicates that Horava-Lifshitz cosmology can be very interesting, Horava-Lifshitz gravity itself may have crucial conceptual and theoretical problems, as a simple perturbation analysis indicates.

lundi 4 juin 2012 - 11:00
Salle des séminaires François Arago,
Institut d'Astrophysique de Paris

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