Quantum field theory in curved space-time as thermo field dynamics

Details Quantum field theory in curved space-time as thermo field dynamics Quantum field theory in curved space-time as thermo field dynamics

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gregr..26..363l&link_type=abstract

General Relativity and Gravitation, Volume 26, Issue 4, pp.363-378

Mathematics

Logic

3

Scientific paper

The strong analogy between states defined in the context of quantum field theory in curved space-time (QFT-CST) and the ones defined in the thermo field dynamics (TFD) of Takahashi and Umezawa [1] is shown. This analogy is useful in order to introduce the entropy operator in CST in the same way as in TFD. When the extremum condition in the thermodynamical potential is imposed, a family of Bogoliubov transformations that give us a planckian spectrum is found, even in “pathological” cases such as the minimally coupled scalar field.

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