Role of Hidden Slow Degrees of Freedom in the Fluctuation Theorem

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2012
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Mehl, Jakob
Lander, Boris
Blickle, Valentin
Seifert, Udo
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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 a fluctuation theorem–like symmetry with a slope of 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 nonlinear behavior can indeed be recovered in our system as well.

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ISO 690MEHL, Jakob, Boris LANDER, Clemens BECHINGER, Valentin BLICKLE, Udo SEIFERT, 2012. Role of Hidden Slow Degrees of Freedom in the Fluctuation Theorem. In: Physical Review Letters. 2012, 108(22), 220601. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.108.220601
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@article{Mehl2012-06-01Hidde-39301,
  year={2012},
  doi={10.1103/PhysRevLett.108.220601},
  title={Role of Hidden Slow Degrees of Freedom in the Fluctuation Theorem},
  number={22},
  volume={108},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Mehl, Jakob and Lander, Boris and Bechinger, Clemens and Blickle, Valentin and Seifert, Udo},
  note={Article Number: 220601}
}
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