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A stochastic approach to the kinetic theory of gases

Author

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  • Malek-Mansour, M.
  • Brenig, L.
  • Horsthemke, W.

Abstract

A theory of fluctuations in non-equilibrium diluted gases is presented. The velocity distribution function is treated as a stochastic variable and a master equation for its probability is derived. This evolution equation is based on two processes: binary hard sphere collisions and free flow. A mean-field approximation leads to a non-linear master equation containing explicitly a parameter which represents the spatial correlation length of the fluctuations. An infinite hierarchy of equations for the successive moments is found. If the correlation length is sufficiently short a truncation after the first equation is possible and this leads to the Boltzmann kinetic equation. The associated probability distribution is Poissonian. As to the fluctuation of the macroscopic quantities, an approximation scheme permits to recover the Langevin approach of fluctuating hydrodynamics near equilibrium and its fluctuation-dissipation relations.

Suggested Citation

  • Malek-Mansour, M. & Brenig, L. & Horsthemke, W., 1977. "A stochastic approach to the kinetic theory of gases," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 88(3), pages 407-424.
    • Handle: RePEc:eee:phsmap:v:88:y:1977:i:3:p:407-424
    DOI: 10.1016/0378-4371(77)90118-2
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    Cited by:

    1. Borgis, D. & Moreau, M., 1984. "On the stochastic theory of a bistable chemical reaction," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 123(1), pages 109-130.
    2. Lemarchand, H., 1980. "Asymptotic solution of the master equation near a nonequilibrium transition: The stationary solutions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 101(2), pages 518-534.
    3. Dambrine, S. & Moreau, M., 1981. "Note on the stochastic theory of a self-catalytic chemical reaction. I," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 106(3), pages 559-573.

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