On Perturbation Expansions for Real-Time Green's Functions
- 1 August 1969
- journal article
- research article
- Published by AIP Publishing in Journal of Mathematical Physics
- Vol. 10 (8) , 1387-1388
- https://doi.org/10.1063/1.1664977
Abstract
A proof by Craig that the perturbation expansion for the real‐time self‐energy of a particle in a many‐particle system has the same form in any statistical state is shown to be invalid and the stated theorem is shown to be untrue.Keywords
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