# Charge asymmetry from CP-violating fermion scattering off bubble walls during the electroweak phase transition

## TL;DR

This paper calculates the electric current generated by CP-violating fermion interactions during a first order electroweak phase transition, exploring its potential to seed magnetic fields in the early universe.

## Contribution

It provides a quantitative analysis of CP-violating fermion scattering effects on current generation during the electroweak phase transition, linking particle physics to cosmological magnetogenesis.

## Key findings

- Net electric current generated during phase transition
- Potential seed magnetic field for early universe
- Impact of CP violation on current formation

## Abstract

We compute the net electric current generated during a first order electroweak phase transition when fermions transit from the false to the true vacuum. This current is generated by the CP-violating fermion interaction with the Higgs during the phase transition and is quantified in terms of a CP-violating phase in the bubble wall separating the symmetric from the symmetry-broken phases. We comment on the seed magnetic field that this current is able to generate and it is possible implications for magnetogenesis in the early universe during the electroweak phase transition.