Non-Gaussianity in a general kind noncanonical warm inflation

TL;DR

This paper investigates the non-Gaussian features of primordial perturbations in a broad class of noncanonical warm inflation models, analyzing contributions from three- and four-point correlations to understand their combined effects.

Contribution

It introduces a comprehensive analysis of total non-Gaussianity in general noncanonical warm inflation, including both three- and four-point correlation contributions, which has not been thoroughly studied before.

Findings

Calculated the three-point correlation contribution to non-Gaussianity.

Analyzed the four-point correlation contribution to non-Gaussianity.

Compared and discussed the relative significance of the two parts.

Abstract

The general kind noncanonical warm inflation is introduced and its total non-Gaussianity of perturbation on uniform energy density hypersurfaces is studied. The total non-Gaussianity contains two complementary parts: the three- and the four-point correlations. The three-point correlation part denoted by $f^{int}_{NL}$, comes from the three-point correlation of inflaton field, while the four-point correlation part, denoted by $f_{NL}^{\delta N}$, is the contribution due to the four-point correlation function of the inflaton field. The aforementioned two parts of non-Gaussianity in general noncanonical warm inflation are calculated and analysed respectively, and the comparisons and discussions of the two parts are finally carried out in this study.