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- W2104927995 startingPage "971" @default.
- W2104927995 abstract "The cluster variation method, which was originally devised for quantum-mechanical many-body systems at zero temperature, is extended to treat finite-temperature systems. The new method is based on a variational principle that the partition function is the maximum of a certain functional, APF (approximate partition function). This method includes the conventional cluster variation method at zero temperature as a limiting case. A procedure is given for calculating APF by cluster expansion for fermion systems. In this procedure, use is made of single-particle energies which should be determined self-consistently. The non-orthogonality problem which comes from the presence of correlations among particles is solved by the use of linear combinations of (generalized) Jastrow wave functions. Further development of this method is briefly discussed." @default.
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- W2104927995 date "1985-11-01" @default.
- W2104927995 modified "2023-09-25" @default.
- W2104927995 title "Cluster Variation Method for Finite-Temperature Systems. I: Formalism for Fermion Systems" @default.
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- W2104927995 doi "https://doi.org/10.1143/ptp.74.971" @default.
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