there and back again... a tale about two-field inflation and non-Gaussianity

Series: 
The London Relativity and Cosmology Seminar
Speaker: 
Eleftheria Tzavara (Paris)
Date: 
November 21st, 2012 at 16:30
Room: 
Maths 103
Abstract: 

Inflationary predictions for the power spectrum of the curvature perturbation have been verified to an excellent degree, leaving many models compatible with observations. Higher-order correlations, if detected or constrained by Planck, will allow one to further distinguish between inflationary models. In this talk I will review the theory of gauge-invariant non-linear cosmological perturbations in the context of two-field inflation as well as the properties of the local bispectrum produced in these models. I will also present the methods I have developed and used for this purpose, which are the long-wavelength formalism and the cubic action of the adiabatic and isocurvature perturbations, and illustrate their use with explicit applications.