Adiabatic approximation and parametric stochastic resonance in a bistable system with periodically driven barrier
In this paper we compare the analytical adiabatic exponential approximation and exact numerical description of fluctuation-induced transitions in a "quartic" potential with periodically driven barrier. We show that the adiabatic approximation gives an adequate description of the processes in a wide region of parameter space and the accuracy of the approximation improves with increasing noise intensity. For parameter values outside this region, a different kind of resonant activation, which we call parametric stochastic resonance, is observed.
Pankratov
AL
Department of Physical Sciences "E.R. Caianiello," University of Salerno, via S. Allende, I84081 Baronissi (SA), Italy.
Salerno
M