Entropic Resonant Activation and Stochastic Resonance Driven by Non-Gaussian Noise

摘要

The transition rate and stochastic resonance (SR)of a Brownian particle moving in a confined systemunder the presence of entropic barriers are investigated when the system is driven by non-Gaussian noise.The explicitexpressions of the transition rate and the spectral power ampliScation (SPA)are obtained,respectively.The effects ofthe parameter q indicating the departure from the Gaussian noise and the correlation time r of the non-Gaussian noiseon the transition rate and the SPA are discussed.Research results show that:(i)The transition rate as a function of thenoise strength exhibits a maximum.This maximum for transition rate identifies the phenomenon of entropic resonantactivation (ERA),the parameter q and the noise correlation time τ weaken the ERA of the system;(ii)The curves ofSPA appear a transition from one peak to double-peak,and then to one peak again as the noise correlation time τ ofnon-Gaussian noise increases.