Comparative Study of Magnetic Moment of Leptons in Hot and Dense Media

TL;DR

This paper investigates how the magnetic moments of leptons vary in hot and dense environments, revealing significant effects for lighter leptons and neutrinos, which impact understanding of particle behavior in early universe and stellar media.

Contribution

It provides a comparative analysis of leptonic magnetic moments considering medium-induced mass changes at high temperatures and densities, highlighting their importance in astrophysical contexts.

Findings

Magnetic moments depend on temperature and chemical potential.

Lighter leptons and neutrinos have non-negligible magnetic moments.

Medium effects significantly alter leptonic magnetic properties.

Abstract

We study the magnetic moment of leptons in extremely hot universe and superdense media of stars at high temperatures. Anomalous magnetic moment of charged leptons is inversely proportional to its mass, whereas, the induced dipole moment of neutral leptons is directly proportional to their mass. Neutral massive point particles exert nonzero magnetic moment as a higher order effect, which is smaller than the anomalous magnetic moment of a charged particle of their same flavor partner. All leptons acquire some extra mass due to their interaction with the medium and affect the magnetic moment accordingly. We compare the contribution to the magnetic moment of various leptons due to their temperature and chemical potential dependent masses. It is shown that the magnetic moment contributions are non-ignorable for lighter leptons and heavy neutrinos. These calculations are very important to study particle propagation in the early universe and in superdense stellar media.