Effect of Dissipation on Warm Chromo-Natural Inflation

TL;DR

This paper explores how dissipation affects warm chromo-natural inflation, analyzing its dynamics, perturbations, and compatibility with observational data, showing reduced tensor-to-scalar ratio compared to standard models.

Contribution

It introduces a variable dissipation coefficient into chromo-natural inflation and studies its effects on cosmological perturbations and observables.

Findings

Cosmological observables are consistent with data.

Tensor-to-scalar ratio is smaller than in standard chromo-natural inflation.

Thermal fluctuations dominate density perturbations.

Abstract

We examined the chromo-natural inflation in the context of warm inflation with variable dissipation coefficient. The dynamical equations of this model are obtained. We studied the cosmological perturbation theory in this model. The sources of density fluctuations in this model are mainly the thermal fluctuations of the inflaton field like general warm inflationary model. Finally, cosmological observables, namely, the spectral index and tensor to scalar ratio are calculated. It is found that the cosmological observables are consistent with observational data and the tensor to scalar ratio is smaller than that in the chromo-natural inflation.