Electronic plasma diffusion with radiation reaction force and time-dependent electric field

TL;DR

This paper derives explicit solutions for electronic plasma diffusion influenced by radiation reaction and a decaying electric field, modeling electron dynamics with a generalized Langevin equation that includes thermal and radiation effects.

Contribution

It introduces a novel analytical approach to solve the plasma diffusion problem considering radiation reaction and time-dependent electric fields within a generalized Langevin framework.

Findings

Explicit solutions for plasma diffusion with radiation reaction

Finite, positive effective memory time enabling physically consistent solutions

Diffusion process characterized as quasi-Markovian including radiation effects

Abstract

In this work the explicit solution of the electronic plasma diffusion with radiation reaction force, under the action of an exponential decay external electric field is given. The electron dynamics is described by a classical generalized Langevin equation characterized by an Ornstein-Uhlenbeck-type friction memory kernel, with an effective memory time which accounts for the effective thermal interaction between the electron and its surroundings (thermal collisions between electrons + radiation reaction force). The incident electric field exerts an electric force on the electron, which in turn can induce an additional damping to the braking radiation force, allowing a delay in the electron characteristic time. This fact allows that the effective memory time be finite and positive, and as a consequence, obtaining physically admissible solutions of the stochastic Abraham-Lorentz-like equation. It is shown that the diffusion process is quasi-Markovian which includes the radiation effects.