Résumé / Abstract Seminaire_GReCO

"Testing the Initial Conditions of the Universe with the Large-Scale Structure: The Galaxy Power Spectrum, Bispectrum and the interesting case of Quasi-Single Field Inflation"

Emiliano Sefusatti
High Energy Group, Abdus Salam International Centre Theoretical Physics (ICTP) (Trieste, Italie)

The possible detection of a non-Gaussian component in the initial condition of the Universe could provide crucial information on the physics of inflation. While current constraints on non-Gaussian parameters are still consistent with the Gaussian hypothesis, the Planck satellite will soon significantly improve these limits. In case of detection, a confirmation from different observables, as for instance the galaxy distribution, will be required. I will review the basic effects of non-Gaussian initial conditions on the evolution of the large-scale structure of the Universe, paying specific attention to how they affect the nonlinear growth, both of the matter power spectrum and higher-order correlation functions as well as the corrections induced to linear and nonlinear galaxy bias. In addition, I will present in details the case of the Quasi-Single Field model of inflation, characterized by a quite rich phenomenology in terms of its observational consequences.

lundi 2 avril 2012 - 11:00
Salle des séminaires François Arago ,
Institut d'Astrophysique de Paris

Page web du séminaire / Seminar's webpage