Perturbation-Theory Rules for Computing the Self-Energy Operator in Quantum Statistical Mechanics
Open Access
- 1 September 1963
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 131 (5), 2345-2349
- https://doi.org/10.1103/physrev.131.2345
Abstract
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-dependent Green's functions.Keywords
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