Toward a magnetic warm inflation scenario

TL;DR

This paper investigates how primordial magnetic fields influence warm inflation models, deriving an analytical effective potential and demonstrating that magnetic effects can support successful inflation by flattening the potential.

Contribution

It provides the first analytical expression for the one-loop effective potential in a magnetic warm inflation scenario with supersymmetry, showing magnetic fields can facilitate inflation.

Findings

Magnetic fields flatten the inflaton potential near the origin.

Magnetic effects preserve conditions for successful warm inflation.

Magnetic fields influence decay widths of heavy particles.

Abstract

In this work we explore the effects that a possible primordial magnetic field can have on the inflaton effective potential, taking as the underlying model a warm inflation scenario, based on global supersymmetry with a new-inflation-type potential. The decay scheme for the inflaton field is a two-step process of radiation production, where the inflaton couples to heavy intermediate superfields, which in turn interact with light particles. In this context, we consider that both sectors, heavy and light, are charged and work in the strong magnetic field approximation for the light fields. We find an analytical expression for the one-loop effective potential, for an arbitrary magnetic field strength, and show that the trend of the magnetic contribution is to make the potential flatter in the origin's vicinity, preserving the conditions for a successful inflationary process. This result is backed up by the behavior of slow-roll parameter $\epsilon$. The viability of this magnetic warm inflation scenario is also supported by the estimation of the effect of the magnetic field on the heavy particles decay width.