Jakob Mehl, Boris Lander, Clemens Bechinger, Valentin Blickle, Udo Seifert
The validity of the fluctuation theorem for entropy production as deduced from the observation of trajectories implicitly requires that all slow degrees of freedom are accessible. We experimentally investigate the role of hidden slow degrees of freedom in a system of two magnetically coupled driven colloidal particles. The apparent entropy production based on the observation of just one particle obeys an fluctuation theorem-like symmetry with slope 1 in the short time limit. For longer times, we find a constant slope but different from 1. We present theoretical arguments for a generic linear behavior both for small and large apparent entropy production but not necessarily throughout. By fine tuning experimental parameters such an intermediate non-linear behavior can indeed be recovered in our system as well.
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http://arxiv.org/abs/1205.0238
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