Linear response in non-equilibrium thermo field dynamics

K. Nakamura, Yoshiya Yamanaka, H. Umezawa

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The linear response theory is discussed in the context of non-equilibrium thermo field dynamics which has been developed in recent years and can deal with a quantum field system in time-dependent non-equilibrium situations. An example of a simple model is given to illustrate the present formalism. Emphasis is put on the fact that in non-equilibrium thermo field dynamics the change of a thermal situation due to an external source should appear through the thermal Bogoliubov transformation, creating a new contribution to the linear response formula. It is also found that the dissipativity naturally comes out in the conventional retarded correlation.

Original languageEnglish
Pages (from-to)29-50
Number of pages22
JournalPhysica A: Statistical Mechanics and its Applications
Volume152
Issue number1-2
DOIs
Publication statusPublished - 1988
Externally publishedYes

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Linear Response
Non-equilibrium
Dissipativity
Quantum Fields
formalism
Model

ASJC Scopus subject areas

  • Mathematical Physics
  • Statistical and Nonlinear Physics

Cite this

Linear response in non-equilibrium thermo field dynamics. / Nakamura, K.; Yamanaka, Yoshiya; Umezawa, H.

In: Physica A: Statistical Mechanics and its Applications, Vol. 152, No. 1-2, 1988, p. 29-50.

Research output: Contribution to journalArticle

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