Dissipative inflation via scalar production

Author:

Creminelli Paolo,Kumar Soubhik,Salehian Borna,Santoni Luca

Abstract

AbstractWe describe a new mechanism that gives rise to dissipation during cosmic inflation. In the simplest implementation, the mechanism requires the presence of a massive scalar field with a softly-broken global U(1) symmetry, along with the inflaton field. Particle production in this scenario takes place on parametrically sub-horizon scales, at variance with the case of dissipation into gauge fields. Consequently, the backreaction of the produced particles on the inflationary dynamics can be treated in alocalmanner, allowing us to compute their effects analytically. We determine the parametric dependence of the power spectrum which deviates from the usual slow-roll expression. Non-Gaussianities are always sizeable whenever perturbations are generated by the noise induced by dissipation:fNLeqO(10).

Publisher

IOP Publishing

Subject

Astronomy and Astrophysics

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