Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/14707
Title: Mean-filed theories with mixed states and associated boson expansions
Authors: Providência, João da 
Fiolhais, C. 
Issue Date: 4-Mar-1985
Publisher: North-Holland
Citation: PROVIDÊNCIA, J. da; FIOLHAIS, C. - Mean-filed theories with mixed states and associated boson expansions. "Nuclear Physics A". ISSN 0375-9474. Vol. 435, nº 1 (1985) p. 190-204
Serial title, monograph or event: Nuclear Physics A
Volume: 435
Issue: 1
Abstract: A variational derivation of the Liouville-von Neumann equation of quantum-statistical mechanics is presented, in order to formulate mean-field approximations appropriate to mixed states. The Hartree-Fock and the RPA at finite temperatures are particular cases of the general formalism. A thermal boson expansion is defined, which allows us to describe anharmonic motion around a thermal excited state. In a numerical application on the basis of the Lipkin model, temperature-dependent phase transitions are observed.
URI: http://hdl.handle.net/10316/14707
ISSN: 0375-9474
DOI: 10.1016/0375-9474(85)90311-2
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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