A note on Keldysh's perturbation formalism

W.P.H. de Boer and Ch.G. Van Weert

Physica A: Statistical Mechanics and its Applications, 1979, vol. 98, issue 3, 579-586

Abstract: The expansion theorem of quantum field theoy relating Heisenberg operators to asymptotic free-field operators is rewritten by means of the time-path technique, originally due to Schwinger, which to date has only found application in statistical mechanics. The theorem is combined with Bogoliubov's initial condition of vanishing correlations in the infinite past to rederive Keldysh's perturbation scheme for non-equilibrium statistical Green's functions.

Date: 1979
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:98:y:1979:i:3:p:579-586

DOI: 10.1016/0378-4371(79)90156-0

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