A Physical Explanation for Tilde System in Thermo Field Dynamics
Dong Mi, He-Shan Song, Ying An
Abstract
For a two-body quantum system, any pure state can be represented by a biorthogonal expression by means of Schmidt decomposition. Using this in the composite system which include a thermodynamic system and its surroundings, it is found that the tilde system in thermo field dynamics is just the surroundings of the real system.
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