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On the best quasiclassical adiabatic approximation for partition functions

โœ Scribed by Sidney Golden

Publisher
Elsevier Science
Year
1975
Tongue
English
Weight
417 KB
Volume
33
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

An explicit proof is given that no sequence of quasi-classical adiabatic approximations in which intrinsic symmetry re. strictions are relased in any way can give an approprhtely approximated partition function sm;Fller than the one diRctly obtainable in the absence of such a sequence.

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We propose to approximate the many-body partition function for a system of interacting Fermions by summing static paths of the Hubbard-Stratonovich representation. We demonstrate with a simple two-level model that the approximation is superior to tinite temperature Hartree theory. Corrections to the