Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2004-07-13
Physics
Condensed Matter
Statistical Mechanics
9 pages, 5 figures. In press in "European Physical Journal B"
Scientific paper
10.1140/epjb/e2004-00268-8
The overdamped motion of a Brownian particle in randomly switching piece-wise metastable linear potential shows noise enhanced stability (NES): the noise stabilizes the metastable system and the system remains in this state for a longer time than in the absence of white noise. The mean first passage time (MFPT) has a maximum at a finite value of white noise intensity. The analytical expression of MFPT in terms of the white noise intensity, the parameters of the potential barrier, and of the dichotomous noise is derived. The conditions for the NES phenomenon and the parameter region where the effect can be observed are obtained. The mean first passage time behaviours as a function of the mean flipping rate of the potential for unstable and metastable initial configurations are also analyzed. We observe the resonant activation phenomenon for initial metastable configuration of the potential profile.
Agudov Nikolay V.
Dubkov Alexander A.
Spagnolo Bernardo
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