Non-Gaussianity in the inflating curvaton

TL;DR

This paper analyzes the generation of curvature perturbations and non-Gaussianity in inflating curvaton models using the delta-N formalism, providing analytic expressions for different inflation durations.

Contribution

It presents an analytic formulation of non-Gaussianity in inflating curvaton scenarios, comparing long and short inflation cases.

Findings

Derived analytic expressions for non-Gaussianity parameter.

Compared effects of long versus short curvaton inflation.

Enhanced understanding of curvature perturbation evolution during inflating curvaton.

Abstract

Inflating curvaton can create curvature perturbation when the curvaton density is slowly varying. Using the delta-N formalism, we discuss the evolution of the curvature perturbation during curvaton inflation and find analytic formulation of the non-Gaussianity parameter. We first consider the inflating curvaton with sufficiently long inflationary expansion. Then we compare the result with short curvaton inflation.