# Viable inflationary magnetogenesis with helical coupling

## TL;DR

This paper proposes a simple inflationary magnetogenesis model with helical coupling that generates strong magnetic fields without back-reaction issues, with potential implications for baryogenesis.

## Contribution

It introduces a viable inflationary magnetogenesis scenario using helical coupling, avoiding back-reaction problems and allowing adjustable magnetic field properties.

## Key findings

- Magnetic fields up to 10^{-7} G can be generated.
- The model produces magnetic fields in a narrow spectral band.
- Implications for baryogenesis impose additional constraints.

## Abstract

We consider helical coupling to electromagnetism and present a simple scenario of evolution of the coupling function leading to a viable inflationary magnetogenesis without the problem of back-reaction. In this scenario, helical magnetic fields of strength of order up to $10^{- 7}\,\text{G}$, when extrapolated to the current epoch, can be generated in a narrow spectral band centered at any reasonable wavenumber by adjusting the model parameters. We discuss implications of this model for baryogenesis, which impose additional constraints on the strength and correlation length of magnetic field.