Time-Dependent Variational Approach for Boson Systems

Applying to boson systems the time-dependent variational principle of Balian and Vénéroni, we derive approximate methods for calculating expectation values when both the measured observable and the density matrix are exponentials of quadratic forms of boson operators. In the zero-temperature limit,...

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Bibliographic Details
Published in:Annals of physics 1999-05, Vol.273 (2), p.242-266
Main Authors: Benarous, Mohamed, Flocard, Hubert
Format: Article
Language:English
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Summary:Applying to boson systems the time-dependent variational principle of Balian and Vénéroni, we derive approximate methods for calculating expectation values when both the measured observable and the density matrix are exponentials of quadratic forms of boson operators. In the zero-temperature limit, the variational equations provide a consistent way to evaluate transition probabilities.
ISSN:0003-4916
1096-035X
DOI:10.1006/aphy.1998.5901