Effects of the $g$-factor in semi-classical kinetic plasma theory

TL;DR

This paper develops a kinetic plasma model incorporating electron spin, revealing new wave modes and resonances linked to the electron's magnetic moment, with implications for plasma wave dynamics.

Contribution

It introduces a generalized spin plasma kinetic theory extending previous models, including spin degrees of freedom and analyzing their effects on plasma wave phenomena.

Findings

New wave-particle resonances depend on the electron's anomalous magnetic moment

Emergence of novel wave modes due to spin effects

Energy conservation in the extended kinetic system

Abstract

A kinetic theory for spin plasmas is put forward, generalizing those of previous authors. In the model, the ordinary phase space is extended to include the spin degrees of freedom. Together with Maxwell's equations, the system is shown to be energy conserving. Analysing the linear properties, it is found that new types of wave-particle resonances are possible, that depend directly on the anomalous magnetic moment of the electron. As a result new wave modes, not present in the absence of spin, appear. The implications of our results are discussed.