Warm-tachyon Gauss-Bonnet inflation in the light of Planck 2015 data

TL;DR

This paper investigates a warm-tachyon inflation model coupled with a Gauss-Bonnet term, deriving observable predictions and constraining model parameters using Planck 2015 data, highlighting the role of the Gauss-Bonnet coupling in inflation termination.

Contribution

It introduces a non-minimally coupled warm-tachyon inflation model with Gauss-Bonnet term and derives its observable predictions constrained by Planck 2015 data.

Findings

Model predictions align with Planck 2015 data.

Gauss-Bonnet coupling influences inflation termination.

High dissipation regime yields specific observable expressions.

Abstract

We study a warm-tachyon inflationary model non-minimally coupled to a Gauss-Bonnet term. The general conditions required for reliability of the model are obtained by considerations of a combined hierarchy of Hubble and Gauss-Bonnet flow functions. The perturbed equations are comprehensively derived in the longitudinal gauge in the presence of slow-roll and quasi-stable conditions. General expressions for observable quantities of interest such as the tensor-to-scalar ratio, scalar spectral index and its running are found in the high dissipation regime. Finally, the model is solved using exponential and inverse power-law potentials, which satisfy the properties of a tachyon potential, with parameters of the model being constrained within the framework of the Planck 2015 data. We show that the Gauss-Bonnet coupling constant controls termination of inflation in such a way as to be in good agreement with the Planck 2015 data.