Magnetic Dipole Moment of Neutrino

TL;DR

This paper recalculates the neutrino magnetic dipole moment in hot and dense environments, revealing that chemical potential significantly influences it, especially in models with extended Higgs sectors, while thermal effects are negligible.

Contribution

It provides a detailed analysis of how high temperature and chemical potential affect neutrino magnetic moments, highlighting the importance of chemical potential in extended Higgs models.

Findings

Chemical potential significantly impacts neutrino magnetic moments.

Thermal background has negligible effect on the magnetic moment.

Extended Higgs sector models show enhanced effects due to neutrino mixing.

Abstract

We recalculate the magnetic moment of neutrinos in a hot and dense medium. The magnetic dipole moment of neutrinos is modified at high temperature and chemical potential. We show that the magnetic dipole moment of electron neutrino does not get a significant contribution from thermal background to meet the cosmological bound. However, chemical potential contribution to the magnetic moment is non-ignorable even when chemical potential is an order of magnitude greater than the electron mass. It is demonstrated that this effect is more significant in the models with an extended Higgs sector through neutrino mixing.