Entropy production and curvature perturbation from dissipative curvatons

TL;DR

This paper explores how dissipative curvatons can produce entropy and curvature perturbations after reheating, offering a new perspective that relaxes the need for a quadratic potential unlike the standard model.

Contribution

It introduces a dissipative slow-roll curvaton model that generates entropy and curvature perturbations without requiring a quadratic potential.

Findings

Spectral index distinguishes warm and thermal dissipative curvatons from standard models.

Dissipative curvatons do not need to oscillate with a quadratic potential.

Entropy production occurs after reheating in the dissipative scenario.

Abstract

Considering the curvaton field that follows dissipative slow-roll equation, we show that the field can lead to entropy production and generation of curvature perturbation after reheating. Spectral index is calculated to discriminate warm and thermal scenarios of dissipative curvatons from the standard curvaton model. In contrast to the original curvaton model, quadratic potential is not needed in the dissipative scenario, since the growth in the oscillating period is not essential for the model.