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One‐Loop Calculation in Time‐Dependent Non‐Equilibrium Thermo Field Dynamics
Author(s) -
Umezawa H.,
Yamanaka Y.
Publication year - 1989
Publication title -
fortschritte der physik/progress of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.469
H-Index - 71
eISSN - 1521-3978
pISSN - 0015-8208
DOI - 10.1002/prop.2190371102
Subject(s) - renormalization , statistical physics , thermal equilibrium , loop (graph theory) , limit (mathematics) , physics , field (mathematics) , scheme (mathematics) , autocatalytic reaction , thermal , dynamics (music) , mathematics , thermodynamics , mathematical physics , mathematical analysis , combinatorics , acoustics , pure mathematics
This paper is a review on the structure of thermo field dynamics (TFD) in which the basic concepts such as the thermal doublets, the quasi‐particles and the self‐consistent renormalization are presented in detail. A strong emphasis is put on the computational scheme. A detailed structure of this scheme is illustrated by the one‐loop calculation in a non‐equilibrium time‐dependent process. A detailed account of the one‐loop calculation has never been reported anywhere. The role of the self‐consistent renormalization is explained. The equilibrium TFD is obtained as the long‐time limit of non‐equilibrium TFD.