Double temperature-enhanced occupancy of metastable states in fluctuating bistable potentials

摘要

Overdamped motion of Brownian particles in an asymmetric bistable potential driven by an additive nonequilibrium three-level noise and a thermal noise is considered. An exact formula for the mean occupancy of the metastable state is derived and the phenomenon of noise-enhanced stability is investigated. It is established that in a certain region of system parameters variations of temperature cause double resonance peaks of the mean occupancy of a metastable state at low and moderate temperatures. The possibility that the occupancy of a metastable state can be controlled by thermal noise at moderate temperatures is important, because temperature can easily be varied in experiments, e.g. in experimental cell biology.