Inflationary magnetogenesis with helical coupling

TL;DR

This paper proposes a straightforward inflationary magnetogenesis model utilizing helical coupling, capable of producing strong, helical magnetic fields within a specific spectral band, with implications for baryogenesis and particle creation constraints.

Contribution

It introduces a simple inflationary magnetogenesis scenario with a helical coupling that can generate significant magnetic fields in a narrow spectral band, adjustable via model parameters.

Findings

Magnetic fields up to 10^{-7} G can be generated.

The model allows spectral tuning of magnetic field generation.

Additional constraints from baryogenesis and Schwinger effect are considered.

Abstract

We describe a simple scenario of inflationary magnetogenesis based on a helical coupling to electromagnetism. It allows to generate helical magnetic fields of strength of order up to $10^{- 7}\,\text{G}$, when extrapolated to the current epoch, in a narrow spectral band centered at any physical wavenumber by adjusting the model parameters. Additional constraints on magnetic fields arise from the considerations of baryogenesis and, possibly, from the Schwinger effect of creation of charged particle-antiparticle pairs.