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Quasi-degenerate many-body Rayleigh-Schrödinger perturbation theory

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Czechoslovak Journal of Physics B Aims and scope

Abstract

Starting from the Hugenholtz diagrammatic technique (resolvent operator and factorization theorem with complex convolution) a quasi-degenerate many-body Rayleigh-Schrödinger perturbation theory is derived. This derivation is based on an algebraic similarity between the formal generalized characteristic problem and its many-body version. Diagrammatic expressions for the perturbed state vectors and mean values of an observable are obtained. The connection between our method and the folded-diagram approach is discussed.

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Authors and Affiliations

  1. Department of Organic Chemistry, Slovak Technical University, Jánská 1, 880 37, Bratislava, Czechoslovakia

    V. Kvasnička

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  1. V. Kvasnička
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Kvasnička, V. Quasi-degenerate many-body Rayleigh-Schrödinger perturbation theory. Czech J Phys 25, 371–391 (1975). https://doi.org/10.1007/BF01589645

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  • DOI: https://doi.org/10.1007/BF01589645

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