Non-gaussianity in the strong regime of warm inflation

TL;DR

This paper analyzes the bispectrum of scalar perturbations in strong warm inflation, revealing significant non-gaussianity with a constant non-linearity parameter, extending previous models by including temperature-dependent damping.

Contribution

It introduces a generalized analysis of non-gaussianity in warm inflation by incorporating temperature-dependent damping terms in the inflaton dynamics.

Findings

Non-gaussianity parameter $f_{NL}$ is approximately 20.

Significant non-gaussianity arises in the strong warm inflation regime.

The analysis extends previous models by including temperature-dependent damping effects.

Abstract

The bispectrum of scalar mode density perturbations is analysed for the strong regime of warm inflationary models. This analysis generalises previous results by allowing damping terms in the inflaton equation of motion that are dependent on temperature. A significant amount of non-gaussianity emerges with constant (or local) non-linearity parameter $f_{NL}\sim 20$, in addition to the terms with non-constant $f_{NL}$ which are characteristic of warm inflation.