Cosmological chirality and magnetic fields from parity violating particle decays

TL;DR

This paper investigates whether parity-violating decays of standard model particles, like tau leptons, can generate significant cosmological magnetic fields through induced chirality.

Contribution

It provides an estimate of the cosmological medium's chirality from parity-violating decays and assesses its impact on magnetic field generation.

Findings

Chirality from tau decays is too small to influence magnetic fields significantly.

Parity violation in standard model decays does not produce substantial cosmological magnetic fields.

Abstract

We estimate the chirality of the cosmological medium due to parity violating decays of standard model particles, focusing on the example of tau leptons. The non-trivial chirality is however too small to make a significant contribution to the cosmological magnetic field via the chiral-magnetic effect.