Hypermagnetic gyrotropy, inflation and the baryon asymmetry of the Universe

TL;DR

This paper explores how evolving hypermagnetic fields during inflation, influenced by pseudo-scalar interactions, can generate the baryon asymmetry of the Universe while satisfying various physical constraints.

Contribution

It introduces a model where hypermagnetic gyrotropy is amplified during inflation through differential gauge coupling evolution and pseudo-scalar interactions, linking it to baryogenesis.

Findings

Identified parameter regions where gyrotropy can seed baryon asymmetry.

Demonstrated compatibility with backreaction and astrophysical constraints.

Mapped the evolution of gauge couplings during inflation.

Abstract

We investigate the production of the hypermagnetic gyrotropy when the electric and magnetic gauge couplings evolve at different rates, as it happens in the the relativistic theory of the Van der Waals forces. If a pseudo-scalar interaction breaks the duality symmetry of the corresponding equations, the gyrotropic configurations of the hypermagnetic fields can be amplified from the vacuum during an inflationary stage of expansion. After charting the parameter space of the model in terms of the rates of evolution of the magnetic and electric gauge couplings, we identify the regions where the gyrotropy is sufficiently intense to seed the baryon asymmetry of the Universe at the electroweak epoch while the backreaction constraints, the strong coupling bounds and the other astrophysical limits are concurrently satisfied.