Highly convenient rules are given for the general term in the time- independent perturbation-theory expansion for the self-energy operator of quantum statistical mechanics. The rules are derived by starting from the usual formalism involving time-independent Green's functions. The well-known formulas for thermodynamic quantities in terms of the self-energy operator are included for completeness. (auth)
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California Univ., Berkeley, CA (United States). Radiation Lab.
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Highly convenient rules are given for the general term in the time- independent perturbation-theory expansion for the self-energy operator of quantum statistical mechanics. The rules are derived by starting from the usual formalism involving time-independent Green's functions. The well-known formulas for thermodynamic quantities in terms of the self-energy operator are included for completeness. (auth)
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Baym, G. & Sessler, A. M.Perturbation-Theory Rules for Computing the Self-Energy Operator in Quantum Statistical Mechanics,
report,
December 17, 1962;
Berkeley, California.
(https://digital.library.unt.edu/ark:/67531/metadc1035536/:
accessed June 9, 2023),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.