Temporally Asymmetric Fluctuations are Sufficient for the Operation of a Correlation Ratchet

Details Temporally Asymmetric Fluctuations are Sufficient for the Operation of a Correlation Ratchet Temporally Asymmetric Fluctuations are Sufficient for the Operation of a Correlation Ratchet

1994-10-17

arxiv.org/abs/cond-mat/9410057v1

Physics

Condensed Matter

17 pages, ps figures on request, LaTeX Article Format

Scientific paper

10.1016/0375-9601(95)00773-0

It has been shown that the combination of a broken spatial symmetry in the potential (or ratchet potential) and time correlations in the driving are crucial, and enough to allow transformation of the fluctuations into work. The required broken spatial symmetry implies a specific molecular arrangement of the proteins involved. Here we show that a broken spatial symmetry is not required, and that temporally asymmetric fluctuations (with mean zero) can be used to do work, even when the ratchet potential is completely symmetric. Temporal asymmetry, defined as a lack of invariance of the statistical properties under the operation to temporal inversion, is a generic property of nonequilibrium fluctuation, and should therefore be expected to be quite common in biological systems.

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