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Linear response in non-equilibrium thermo field dynamics

Author

Listed:
  • Nakamura, K.
  • Yamanaka, Y.
  • Umezawa, H.

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.

Suggested Citation

  • Nakamura, K. & Yamanaka, Y. & Umezawa, H., 1988. "Linear response in non-equilibrium thermo field dynamics," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 152(1), pages 29-50.
    • Handle: RePEc:eee:phsmap:v:152:y:1988:i:1:p:29-50
    DOI: 10.1016/0378-4371(88)90064-7
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    References listed on IDEAS

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    1. Arimitsu, T. & Umezawa, H. & Yamanaka, Y. & Papastamatiou, N.J., 1988. "Spontaneous creation of dissipation in thermo field dynamics and its examples," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 148(1), pages 27-45.
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