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The averaging principle and the diagram technique

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  • Deshpande, S.M.

Abstract

Rae and Davidson have found a striking connection between the averaging method generalised by Kruskal and the diagram technique used by the Brussels school in statistical mechanics. They have considered conservative systems whose evolution is governed by the Liouville equation. In this paper we have considered a class of dissipative systems whose evolution is governed not by the Liouville equation but by the last-multiplier equation of Jacobi whose Fourier transform has been shown to be the Hopf equation. The application of the diagram technique to the interaction representation of the Jacobi equation reveals the presence of two kinds of interactions, namely the transition from one mode to another and the persistence of a mode. The first kind occurs in the treatment of conservative systems while the latter type is unique to dissipative fields and is precisely the one that determines the asymptotic Jacobi equation. The dynamical equations of motion equivalent to this limiting Jacobi equation have been shown to be the same as averaged equations.

Suggested Citation

  • Deshpande, S.M., 1975. "The averaging principle and the diagram technique," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 80(3), pages 287-299.
    • Handle: RePEc:eee:phsmap:v:80:y:1975:i:3:p:287-299
    DOI: 10.1016/0378-4371(75)90110-7
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