Abstract

Underdamped bistable dynamical systems driven by both periodic and noisy forces show the typical phenomenon of Stochastic Resonance. Such a phe- nomenon, characterized by the increase in the periodic component of the system response as a function of the noise intensity, can be ascribed to two different mech- anisms which, under certain condition, can coexist resulting in a characteristic double maximum in the power spectral amplitude. The locations of these maxima correspond to matchings of deterministic and stochastic time-scales in the system thus supporting the use of the term resonances.

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