Warm inflation with an oscillatory inflaton in the non-minimal kinetic coupling model

TL;DR

This paper introduces a novel warm inflation model where the inflaton oscillates rapidly without a preceding slow roll phase, utilizing non-minimal derivative coupling to achieve sufficient inflation and analyzing cosmological perturbations.

Contribution

It proposes a new warm inflation scenario with an oscillatory inflaton phase, differing from traditional models by suppressing the slow roll period and incorporating non-minimal kinetic coupling.

Findings

Achieves enough e-folds with the oscillatory inflaton model.

Calculates the temperature at the end of warm oscillatory inflation.

Analyzes cosmological perturbations in the new framework.

Abstract

In the cold inflation scenario, the slow roll inflation and reheating via coherent rapid oscillation, are usually considered as two distinct eras. When the slow roll ends, a rapid oscillation phase begins and the inflaton decays to relativistic particles reheating the Universe. In another model dubbed warm inflation, the rapid oscillation phase is suppressed, and we are left with only a slow roll period during which the reheating occurs. Instead, in this paper, we propose a new picture for inflation in which the slow roll era is suppressed and only the rapid oscillation phase exists. Radiation generation during this era is taken into account, so we have warm inflation with an oscillatory inflaton. To provide enough e-folds, we employ the non-minimal derivative coupling model. We study the cosmological perturbations and compute the temperature at the end of warm oscillatory inflation.