Model of inflationary magnetogenesis

TL;DR

This paper proposes a model where electromagnetic fields are coupled to gravity during inflation, enabling the generation of large primordial magnetic fields without common theoretical issues, potentially explaining observed cosmic magnetism.

Contribution

It introduces a novel inflationary magnetogenesis model with dynamical couplings that avoids the strong coupling, backreaction, and curvature perturbation problems.

Findings

Large primordial magnetic fields can be generated during inflation.

The model avoids the strong coupling problem.

The model avoids the backreaction problem.

Abstract

We consider the possibility of inflationary magnetogenesis due to dynamical couplings of the electromagnetic fields to gravity. We find that large primordial magnetic fields can be generated during inflation without the strong coupling problem, backreaction problem, or curvature perturbation problem, which seed large-scale magnetic fields with observationally interesting strengths.