Spectroscopy of two-field Inflation

Abstract

This thesis is about cosmological inflation and its

relation to observations. In part I we study the observational consequences

of an additional scalar field besides the inflaton field. In particular, we

focus on several different regimes where we vary both the coupling between the fields and the mass of the second field. In part II we perform a statistical analysis to understand whether we can extract some of the traces of new physics present during inflation from the three-dimensional map of galaxies in our universe.