Self-diffusion in a nonuniform model system

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Abstract

We prove that the motion of a tagged particle in a one-dimensional fluid of hard point particles in an external potential U may be asymptotically described by a diffusion process. The process is spatially homogeneous or inhomogeneous according to whether U varies on a microscopic or macroscopic scale. The latter process can still be described by a simple Langevin equation, provided that one interprets it in the sense of Stratonovich.

Original languageEnglish (US)
Pages (from-to)2481-2484
Number of pages4
JournalPhysical review letters
Volume57
Issue number20
DOIs
StatePublished - 1986

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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