Probing nonequilibrium fluctuations through linear response.
Linear response analysis in the nonequilibrium steady state (Gaussian regime) provides two independent fluctuation-response relations. One, in the form of the symmetric matrix, manifests the departure from the equilibrium formula through the quantity so-called irreversible circulation. The other, in the antisymmetric form, connects the asymmetries in the fluctuation and the response function. These formulas represent characteristic features of fluctuations far from equilibrium, which have no counterparts in thermal equilibrium.
Sakaue
Takahiro
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Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan. sakaue@scphys.kyoto-u.ac.jp
Ohta
Takao
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