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Comments on the exclusion‐principle‐violating diagrams cancellation in correlations energy calculation by many‐body Rayleigh–Schrödinger perturbation theory
Author(s) -
Hubač Ivan
Publication year - 1980
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560170205
Subject(s) - perturbation theory (quantum mechanics) , perturbation (astronomy) , rayleigh scattering , schrödinger's cat , physics , diagram , statistical physics , mathematics , theoretical physics , mathematical physics , quantum mechanics , statistics
When calculating the correlation energy where the effect of higher than double excitations is included by means of many‐body Rayleigh–Schrödinger perturbation theory ( MB ‐ RSPT ) through fourth order the problem of cancellation of exclusion‐principle‐violating ( EPV ) diagrams arises. The cancellation of EPV diagrams in fourth order of MB ‐ RSPT is demonstrated for diagrams which include the effect of tetraexcitations.