Multi-field cold and warm inflation and the de Sitter swampland conjectures

TL;DR

This paper examines the compatibility of multi-field cold and warm inflation models with string theory's swampland conjectures, finding cold inflation generally incompatible but warm inflation potentially compatible under strong dissipation.

Contribution

It provides a detailed analysis of how multi-field inflation models relate to swampland conjectures, highlighting conditions where warm inflation aligns with these theoretical constraints.

Findings

Cold inflation's slow-roll conditions conflict with swampland conjectures.

Warm inflation can satisfy swampland conditions in the strong dissipative regime.

The compatibility depends on the inflationary regime and number of scalar fields.

Abstract

We discuss under which conditions multi-field cold and warm inflationary models with canonical kinetic energy terms are compatible with the swampland conjectures about the emergence of de Sitter solutions in string theory. We find that under quite general conditions the slow-roll conditions for multi-field cold inflation are at odds with the swampland conjectures for an arbitrary number of scalar fields driving inflation. However, slow-roll conditions can be reconciled with the swampland conjectures in the strong dissipative regime of warm inflation.