Derivation of a Nonautonomous Linear Boltzmann Equation from a Heterogeneous Rayleigh Gas

Karsten Matthies, George Stone

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Abstract

A linear Boltzmann equation with non-autonomous collision operator is rigorously derived in the Boltzmann-Grad limit for the deterministic dynamics of a Rayleigh gas where a tagged particle is undergoing hard-sphere collisions with heterogeneously distributed background particles, which do not interact among each other. The validity of the linear Boltzmann equation holds for arbitrary long times under moderate assumptions on spatial continuity and higher moments of the initial distributions of the tagged particle and the heterogeneous, non-equilibrium distribution of the background. The empiric particle dynamics are compared to the Boltzmann dynamics using evolution systems for Kolmogorov equations of associated probability measures on collision histories.

Original languageEnglish
Pages (from-to)3299-3355
Number of pages57
JournalDiscrete and Continuous Dynamical Systems - Series A
Volume38
Issue number7
DOIs
Publication statusPublished - 1 Jul 2018

Keywords

  • Boltzmann equation
  • Derivation
  • Evolution system
  • Rayleigh gas.
  • Semigroup

ASJC Scopus subject areas

  • Analysis
  • Discrete Mathematics and Combinatorics
  • Applied Mathematics

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