Heisenberg and interaction representations in thermo field dynamics

T. S. Evans, I. Hardman, H. Umezawa, Y. Yamanaka

研究成果: Article

22 引用 (Scopus)

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In this paper the so-called α degree of freedom appearing in thermal quantum field theory is discussed, using thermo field dynamics (TFD). This paper is confined to stationary thermal situations, both nonequilibrium and equilibrium. The main result is that when the stationary number distribution differs from the equilibrium one the use of time ordered and antitime ordered formalisms picks up α = 1 and α = 0, in contrast to the general belief that the Feynman diagram method is usable for any other a as well. This situation in TFD will be compared with the other approaches. The reason why the Feynman diagram method becomes available for any a in the case of the equilibrium distributions is also studied.

元の言語English
ページ(範囲)370-378
ページ数9
ジャーナルJournal of Mathematical Physics
33
発行部数1
DOI
出版物ステータスPublished - 1992 1 1
外部発表Yes

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics

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