No gaussianidad y correcciones de lazo en un modelo inflacionario de rodadura lenta con potencial escalar cuadrático de dos componentes. Parte II

Abstract

We calculate the trispectrum Tζ(k1, k2, k3, k4) of the curvature perturbation ζ, generated during an inflationary slow-roll epoch and considering a two-component quadratic scalar potential. At calculating we consider tree-level and one-loop contributions, showing that it is possible to obtain an observable value for the non-gaussianity level τNL if Tζ is dominated by the one-loop contribution. The work is developed taking into account that there exist some physical restrictions that reduce the available parameter window. Such conditions are: the existence of a coupling constant that guarantees making the calculation in a perturbative regime, the relative weight of the tree-level and one-loop contributions, the spectrum normalisation, the observed spectral index, and the minimum amount of inflation required to solve the horizon problem.