Primordial fluctuations in the warm inflation scenario with a more realistic coarse - grained field

TL;DR

This paper investigates a semiclassical warm inflation model using a new coarse-grained field to analyze matter fluctuations and derive constraints on model parameters based on the power spectrum and spectral index.

Contribution

It introduces a novel coarse-grained field with a suppression factor G to better describe observable matter fluctuations in warm inflation.

Findings

Derived constraints on the matter field mass in de Sitter expansion.

Established limits on the friction parameter in power-law expansion.

Analyzed the power spectrum of fluctuations in different universe expansion models.

Abstract

I study a semiclassical approach to warm inflation scenario introduced in previous works. In this work, I define the fluctuations for the matter field by means of a new coarse - grained field with a suppression factor G. This field describes the matter field fluctuations on the now observable scale of the universe. The power spectrum for the fluctuations of the matter field is analyzed in both, de Sitter and power - law expansions for the universe. The constraint for the spectral index gives a constraint for the mass of the matter field in the de Sitter expansion and a constraint for the friction parameter in the power - law expansion for the universe.