On the Bulk Velocity of Brownian Ratchets
Abstract
In this paper we study the unidirectional transport effect for Brownian ratchets modeled by Fokker--Planck-type equations. In particular, we consider the adiabatic and semiadiabatic limits for tilting ratchets, generic ratchets with small diffusion, and the multistate chemical ratchets. Having established a linear relation between the bulk transport velocity and the biperiodic solution, and using relative entropy estimates and new functional inequalities, we obtain explicit asymptotic formulas for the transport velocity and qualitative results concerning the direction of transport. In particular, we prove the conjecture by Blanchet, Dolbeault, and Kowalczyk that the bulk velocity of the stochastic Stokes' drift is nonzero for every nonconstant potential.
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Information & Authors
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Published In
SIAM Journal on Mathematical Analysis
Pages: 950 - 980
DOI: 10.1137/15M1016205
ISSN (online): 1095-7154
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© 2016, Society for Industrial and Applied Mathematics.
History
Submitted: 9 April 2015
Accepted: 28 December 2015
Published online: 15 March 2016
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