Abstract:
A method is developed for finding the correlation functions of thermodynamic fluctuations
in nonlinear systems. It is shown that of the nonlinear parameters that characterize the
system only those that determine irreversible processes in the system affect the correlation properties. With regard to dissipative processes , only the dissipation coefficients of
the linearized system occur in the correlation functions. In particular, the correlation
functions of the fluctuations of the current and voltage of a $C$, $R$ circuit are determined by
the nonlinear capacitance and do not depend on the nonlinearity of the resistance.
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