Thermal degree of freedom in thermo field dynamics

H. Umezawa, Yoshiya Yamanaka

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The view of the thermal degree of freedom for the quantum field system, using the language of thermo field dynamics, is elaborated in this paper: the thermal degree of freedom is the degree of freedom to move through degenerate thermal vacua associated with spontaneous breakdown of a certain symmetry (Ĝ-symmetry). Based on this view, we study a quasi-particle picture, in which the Ĝ-transformation becomes the thermal Bogoliubov transformation.

Original languageEnglish
Pages (from-to)75-82
Number of pages8
JournalPhysics Letters A
Volume155
Issue number2-3
DOIs
Publication statusPublished - 1991 May 6
Externally publishedYes

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degrees of freedom
elementary excitations
breakdown
symmetry

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Thermal degree of freedom in thermo field dynamics. / Umezawa, H.; Yamanaka, Yoshiya.

In: Physics Letters A, Vol. 155, No. 2-3, 06.05.1991, p. 75-82.

Research output: Contribution to journalArticle

Umezawa, H. ; Yamanaka, Yoshiya. / Thermal degree of freedom in thermo field dynamics. In: Physics Letters A. 1991 ; Vol. 155, No. 2-3. pp. 75-82.
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