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General linear response formula in statistical mechanics, and the fluctuation-dissipation theorem far from equilibrium. (English) Zbl 0940.82035
Summary: Given a nonequilibrium steady state $$\rho$$ the author derives formally the linear response formula for the variation of an expectation value at time t under a time-dependent infinitesimal perturbation $$\delta_{\tau} F$$ of the acting forces. This leads to a form of the fluctuation-dissipation theorem valid far from equilibrium: the complex singularities of the susceptibility are in part those of the spectral density, and in part of a different nature to be discussed.

##### MSC:
 82C05 Classical dynamic and nonequilibrium statistical mechanics (general)
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##### References:
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