STOCHASTIC RESONANCE IN MAPS AND COUPLED MAP LATTICES

We demonstrate the phenomenon of stochastic resonance (SR) for discret e-time dynamical systems. We investigate various systems that are not necessarily bistable, but do have two well-defined states, su;itching between which is aided by external noise which can be additive or mult iplicative. Thus we find it to be a fairly generic phenomenon. In thes e systems, we investigate kinetic aspects like hysteresis which reflec t the nonlinear and dissipative nature of the response of the system t o the external field. We also explore spatially extended systems with additive or parametric noise and find that they differ qualitatively.