A note on Single-field Inflation and the Swampland Criteria

TL;DR

This paper examines how the Swampland Criteria impact single-field inflation models, finding Warm Inflation as the most compatible scenario with these theoretical constraints.

Contribution

It analyzes the compatibility of various single-field inflation models with the Swampland Criteria, highlighting Warm Inflation as the most suitable.

Findings

Warm Inflation best fits Swampland constraints

Old and refined Swampland conjectures restrict scalar potentials

Single-field slow-roll inflation faces significant challenges

Abstract

The recently proposed Swampland Criteria aim to evade any (meta-)stable de Sitter constructions within String landscapes, making it difficult to accommodate accelerating phases, like dark energy domination and inflationary epoch, in cosmology. In this note, we analyse the status of various models of single field slow-roll inflation given the old as well as the refined Swampland conjectures, which constrain the form of scalar potentials in any low energy effective field theory residing in the landscapes. In particular, we note that Warm Inflation turns out to be the most befitting scenario as long as lifting the tensions with Swampland Criteria are concerned.