Linear response in non-equilibrium thermo field dynamics

K. Nakamura, Y. Yamanaka and H. Umezawa

Physica A: Statistical Mechanics and its Applications, 1988, vol. 152, issue 1, 29-50

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.

Date: 1988
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:152:y:1988:i:1:p:29-50

DOI: 10.1016/0378-4371(88)90064-7

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