Generalizations of the thermal Bogoliubov transformation
Abstract
The thermal Bogoliubov transformation in thermo field dynamics is generalized in two respects. First, a generalization of the α--degree of freedom to tilde non--conserving representations is considered. Secondly, the usual 2×2 Bogoliubov matrix is extended to a 4×4 matrix including mixing of modes with non--trivial multiparticle correlations. The analysis is carried out for both bosons and fermions.
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