Coherent State Combined with Mixed State for an Imperfect Boson System. I  Thermalization of Pure Squeezed Coherent State 
Abstract
A pure squeezed coherent state is amalgamated with a mixed state for the purpose of describing bose condensation in an imperfect spinless boson system at nonzero temperature. Three types of variables are introduced: One describes the bose condensation, one describes the quantum fluctuations of a condensed pair induced by the interaction, and one describes the thermal properties. We define an entropy in association with the amalgamated state. Then, the thermal equilibrium state is defined through a variational principle with a fixed boson number and entropy.
 Publication:

Progress of Theoretical Physics
 Pub Date:
 May 2005
 DOI:
 10.1143/PTP.113.993
 Bibcode:
 2005PThPh.113..993K