Please use this identifier to cite or link to this item:
https://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: | https://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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Mean-field theories with mixed states.pdf | 453.73 kB | Adobe PDF | View/Open |
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