Fluidized Granular Medium as an Instance of the Fluctuation Theorem

Klebert Feitosa and Narayanan Menon
Phys. Rev. Lett. 92, 164301 – Published 21 April 2004

Abstract

We study the statistics of the power flux into a collection of inelastic beads maintained in a fluidized steady state by external mechanical driving. The power shows large fluctuations, including frequent large negative fluctuations, about its average value. The relative probabilities of positive and negative fluctuations in the power flux are in close accord with the fluctuation theorem of Gallavotti and Cohen, even at time scales shorter than those required by the theorem. We also compare an effective temperature that emerges from this analysis to the kinetic granular temperature.

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  • Received 14 August 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.164301

©2004 American Physical Society

Authors & Affiliations

Klebert Feitosa* and Narayanan Menon

  • Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003-3720, USA

  • *Electronic address: kfeitosa@physics.umass.edu
  • Electronic address: menon@physics.umass.edu

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Issue

Vol. 92, Iss. 16 — 23 April 2004

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