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- W2048085404 abstract "Siegert's representation (1960) for the grand canonical partition function of a fermion system with two-particle interactions serves as a starting point for a perturbation expansion around stationary points. It is shown that, in general, the latter are given by solutions of the time-independent Hartree equation. Introducing more general random fields, exchange terms are obtained in the stationarity equation. The procedure is extended to relativistic systems. A perturbative expansion for e.g. the ground-state energy of the N-particle relativistic bound-state problem is obtained which allows, contrary to 'Hamiltonian methods', a straightforward application of standard regularisation and renormalisation procedures." @default.
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- W2048085404 date "1982-12-14" @default.
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- W2048085404 title "Optimised mean fields for atoms. I. Mean-field methods for the description of N-fermion systems" @default.
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- W2048085404 doi "https://doi.org/10.1088/0022-3700/15/23/013" @default.
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