Swampland, Axions and Minimal Warm Inflation

TL;DR

This paper explores how a specific minimal warm inflation model with axionic coupling can produce cosmologically viable inflationary scenarios that satisfy various swampland conjectures, including the dS bounds.

Contribution

It demonstrates that the recently proposed Minimal Warm Inflation model naturally aligns with swampland constraints while fitting observational data.

Findings

Models fit cosmological observations

Models satisfy dS swampland bounds

Models adhere to swampland distance and censorship bounds

Abstract

Warm inflation has been noted previously as a possible way to implement inflationary models compatible with the dS swampland bounds. But often in these discussions the heat bath dynamics is kept largely unspecified. We point out that the recently introduced Minimal Warm Inflation of arXiv:1910.07525, where an axionic coupling of the inflaton leads to an explicit model for the thermal bath, yields models of inflation that can easily fit cosmological observations while satisfying de Sitter swampland bounds, as well as the swampland distance bound and trans-Planckian censorship.