Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1993-04-21
Physics
High Energy Physics
High Energy Physics - Theory
20 pages, Latex, Nordita 93/33 P
Scientific paper
10.1016/0378-4371(94)90480-4
The thermal Bogoliubov transformation in thermo field dynamics is generalized in two respects. First, a generalization of the $\alpha$--degree of freedom to tilde non--conserving representations is considered. Secondly, the usual $2\times2$ Bogoliubov matrix is extended to a $4\times4$ matrix including mixing of modes with non--trivial multiparticle correlations. The analysis is carried out for both bosons and fermions.
Elmfors Per
Umezawa Hitoshi
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