L\'{e}vy walk dynamics in non-static media

TL;DR

This paper models Levy walks in non-static media, deriving equations for particle distribution, analyzing statistical properties like MSDs and kurtosis, and exploring asymptotic behaviors and first passage times through simulations.

Contribution

It introduces a new model for Levy walks in non-static media, connecting physical and comoving coordinates via scale factors and deriving related statistical properties.

Findings

Derived equations for particle probability density functions.

Analyzed asymptotic behaviors of MSDs in different media.

Numerically studied stationary distributions and first passage times.

Abstract

Almost all the media the particles move in are non-static. Depending on the expected resolution of the studied dynamics and the amplitude of the displacement of the media, sometimes the non-static behaviours of the media can not be ignored. In this paper, we build the model describing L\'evy walks in non-static media, where the physical and comoving coordinates are connected by scale factor. We derive the equation governing the probability density function of the position of the particles in comoving coordinate. Using the Hermite orthogonal polynomial expansions, some statistical properties are obtained, such as mean squared displacements (MSDs) in both coordinates and kurtosis. For some representative non-static media and L\'{e}vy walks, the asymptotic behaviors of MSDs in both coordinates are analyzed in detail. The stationary distributions and mean first passage time for some cases are also discussed through numerical simulations.