Non Markovian electron Brownian motion with radiation reaction force

TL;DR

This paper investigates non-Markovian electron diffusion considering radiation reaction effects, using a generalized Langevin equation with an effective memory time, and provides analytical solutions validated by numerical simulations.

Contribution

It introduces an effective memory time to incorporate radiation reaction into a non-Markovian Langevin framework, enabling causality-preserving analytical solutions.

Findings

Analytical solutions of the Abraham-Lorentz-like equation without causality violation.

Effective memory time accounts for radiation reaction effects in electron diffusion.

Numerical simulations confirm the theoretical predictions.

Abstract

In this work, we study non-Markovian electronic plasma diffusion from a classical point of view, taking into account the effects of the radiation reaction force. The electron Brownian motion is described by a Generalized Langevin Equation (GLE) characterized by an Ornstein-Uhlenbeck-type friction memory kernel. To take into account the effects of the radiation reaction force, an effective memory time which accounts for the thermal interaction of the Brownian particle with its surroundings is proposed. This effective memory time is defined as tauef equal tau minus tau0 less than 0, where the memory time tau accounts for the collision time between electrons in a Brownian motion-like manner, and tau0 is due to the interaction with the radiation reaction force. Under these conditions, the GLE can be transformed into a stochastic Abraham-Lorentz-like equation, which is analytically solved without violation of causality. The theoretical results will be compared with the numerical simulation.