Warm inflation in the presence of magnetic fields

TL;DR

This paper investigates how primordial magnetic fields influence warm inflation models, showing that magnetic fields further flatten the inflationary potential, leading to a smoother transition during inflation.

Contribution

It demonstrates that primordial magnetic fields enhance the flatness of the inflationary potential in a supersymmetric warm inflation model, affecting the inflation dynamics.

Findings

Magnetic fields make the inflationary potential flatter.

Magnetic fields retard the transition and smoothen inflation.

The model remains consistent with slow-roll conditions despite thermal and magnetic effects.

Abstract

We study the effects of primordial magnetic fields on the inflationary potential in the context of a warm inflation scenario. The model, based on global supersymmetry with a new-inflation-type potential and a coupling between the inflaton and a heavy intermediate superfield, is already known to preserve the flatness required for slow-roll conditions even after including thermal contributions. Here we show that the magnetic field makes the potential even flatter, retarding the transition and rendering it smoother.