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Prog. Theor. Phys. Vol. 79 No. 2 (1988) pp. 373-395

[ Full Text PDF : FREE ACCESS (1056K) ]

Nonequilibrium Vacuum in Thermo Field Dynamics

Hideki Matsumoto

Dipartimento di Fisica Teorica e sue Metodologie per le Scienze Applicate, Università di Salerno, 84100 Salerno

(Received April 30, 1986)

Abstract:

In the framework of thermo field dynamics, the so-called thermal state conditions of the vacuum are extended from the equilibrium case to general cases in the Heisenberg picture. The formalism is shown to describe nonequilibrium phenomena of a quantum field system. It is shown that the causal formulation of a perturbation theory is developed. As an example of application of the perturbation theory, an effective Hamiltonian describing a reservoir effect is obtained.


URL : http://ptp.ipap.jp/link?PTP/79/373/
DOI : 10.1143/PTP.79.373

[ Full Text PDF : FREE ACCESS (1056K) ] Citation:

References:

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Citing Article(s) :

  1. Progress of Theoretical Physics Vol. 79 No. 3 (1988) pp. 627-644 :
    An Effective Hamiltonian in Nonequilibrium Thermo Field Dynamics with a Reservoir
    Hideki Matsumoto
  2. Progress of Theoretical Physics Vol. 80 No. 1 (1988) pp. 57-82 :
    Self-Consistent Perturbation Method in Thermo Field Dynamics
    Hideki Matsumoto
  3. Progress of Theoretical Physics Vol. 105 No. 4 (2001) pp. 573-590 :
    Nonequilibrium Formulation in Bose-Einstein Condensed States
    Hideki Matsumoto and Shoichi Sakamoto

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