LINEAR-RESPONSE THEORY IN STOCHASTIC RESONANCE

The susceptibility of an overdamped Markov system fluctuating in a bis table potential of general form is obtained by analytic solution of th e Fokker-Planck equation (FPE) for low noise intensities. The results are discussed in the context of the LRT theory of stochastic resonance . They go over into recent results of Hu et al. [Phys. Lett. A 172 (19 92) 21] obtained from the FPE for the case of a symmetrical potential, and they coincide with the LRT results of Dykman et al. [Phys. Rev. L ett. 65 (1990) 2606; JETP Lett. 52 (1990) 144; Phys. Rev. Lett. 68 (19 92) 2985] obtained for the general case of bistable systems.