Non-equilibrium Green functions: generalized Wick's theorem and diagrammatic perturbation with initial correlations
- 1 February 1975
- journal article
- Published by IOP Publishing in Journal of Physics A: General Physics
- Vol. 8 (2) , 214-225
- https://doi.org/10.1088/0305-4470/8/2/012
Abstract
Wick's theorem is combined with a cluster composition to derive a generalized statistical Wick's theorem for a non-equilibrium system with initial correlations. This enables a diagrammatic time-dependent perturbation theory which is a simple extension of the usual one to be developed for time-path causal statistical Green functions and their matrix equivalents. This provides a complete non-equilibrium theory. Reduction of diagrams and equations of motion for the Green functions are also discussed.Keywords
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