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Related Experiment Videos

Extension of the fluctuation theorem.

R van Zon1, E G D Cohen

  • 1The Rockefeller University, 1230 York Avenue, New York, New York 10021, USA.

Physical Review Letters
|October 4, 2003
PubMed
Summary

This study on heat fluctuations in Brownian motion reveals that large heat absorption events are more probable than heat supply events. These findings extend fluctuation theorems and are observable in experiments.

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Area of Science:

  • Thermodynamics
  • Statistical Mechanics
  • Non-equilibrium Physics

Background:

  • Understanding heat fluctuations is crucial in dissipative systems.
  • Brownian motion provides a fundamental model for studying stochastic processes.

Purpose of the Study:

  • To derive an extended stationary state fluctuation theorem for a Brownian particle in a moving potential.
  • To investigate the behavior of heat fluctuations in a system with deterministic and stochastic elements.

Main Methods:

  • Modeling a Brownian particle dragged through water by a moving potential.
  • Extending the stationary state fluctuation theorem.

Main Results:

  • Derived an extended stationary state fluctuation theorem.
  • Showed that for large fluctuations, the probability of absorbing heat significantly exceeds supplying heat.
  • Demonstrated that this effect persists for finite times.

Conclusions:

  • The extended fluctuation theorem provides new insights into heat dissipation.
  • The predicted asymmetry in heat absorption versus supply is experimentally observable.

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