Chiral asymmetry during the EWPT from CP-violating scattering off bubble walls

TL;DR

This paper calculates a net electric current generated during the electroweak phase transition due to CP-violating interactions with bubble walls, which could seed primordial magnetic fields in the early Universe.

Contribution

It introduces a novel calculation of electric currents arising from CP-violating scattering during the EWPT, linking particle physics to cosmological magnetic field origins.

Findings

Net electric current generated during EWPT

Potential seed magnetic field for primordial magnetogenesis

Impact of CP-violating phase on fermion propagation

Abstract

We compute a net electric current during a first order EWPT arising from the asymmetric propagation of fermion chiral modes due to a CP-violating interaction with the Higgs. The interaction is quantified in terms of a CP-violating phase in the bubble wall that separate both false and true vacuum phases. We comment on the possibility of this current to generate a seed magnetic field and its implications for primordial magne- togenesis in the early Universe.