Warm natural inflation

TL;DR

This paper proposes a warm inflation model utilizing pseudo-Nambu-Goldstone bosons to achieve large dissipative couplings without destabilizing the inflaton potential, consistent with CMB observations.

Contribution

It introduces a supersymmetric warm inflation framework with Pseudo-Nambu-Goldstone Bosons, ensuring suppressed radiative and thermal corrections at GUT scale symmetry breaking.

Findings

Model matches observed CMB anisotropy amplitude.

Spectral index consistent with observations.

Potential stability under radiative corrections.

Abstract

In warm inflation models there is the requirement of generating large dissipative couplings of the inflaton with radiation, while at the same time, not de-stabilising the flatness of the inflaton potential due to radiative corrections. One way to achieve this without fine tuning unrelated couplings is by supersymmetry. In this paper we show that if the inflaton and other light fields are Pseudo-Nambu-Goldstone Bosons then the radiative corrections to the potential are suppressed and the thermal corrections are small as long as the temperature is below the symmetry breaking scale. In such models it is possible to fulfill the contrary requirements of an inflaton potential which is stable under radiative corrections and the generation of a large dissipative coupling of the inflaton field with other light fields. We construct a warm inflation model which gives the observed CMB-anisotropy amplitude and spectral index where the symmetry breaking is at the GUT scale.