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Constructive role of noise: Fast fluctuation asymptotics of transport in stochastic ratchets

Chaos, ISSN: 1054-1500, Vol: 8, Issue: 3, Page: 643-649
1998
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The constructive role of random fluctuations is studied in the context of transport in stochastic ratchets. We discuss the interplay of independent white (thermal) and discrete (external) noises and their generation of transport in anisotropic potentials. The constructive cooperation of such fluctuations is most apparent in the asymptotic limit of fast discrete-valued noise, a limit which presents some interesting mathematical features. We describe the asymptotic analysis of the current in the limit of fast external noise, pointing out the strong qualitative dependence of the current on the interplay of the independent noise sources and its surprising sensitivity to the regularity of the underlying anisotropic ratchet potential. © 1998 American Institute of Physics.

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