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Finite-temperature T matrix in a real-time formalism

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A generalized off-shell unitarity relation for the two-body scattering T matrix in a many-body medium at finite temperature is derived, through a consistent real-time perturbation expansion by means of Feynman diagrams. We comment on perturbation schemes at finite temperature in connection with an erroneous formulation of the Dyson equation in a paper recently published.

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Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevA.17.480

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Articles publicats en revistes (Física de la Matèria Condensada)

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Finite-temperature T matrix in a real-time formalism