Fluctuation Theorems for an Asymmetric Rotor in a Granular Gas

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We investigate the validity of fluctuation theorems for an asymmetric rotor experiment in a granular gas. A first state, with a Gaussian distribution of the angular velocity, is found to be well described by a first order Langevin equation. We show that fluctuation theorems are valid for the injected work and for the total entropy production. In a second state, the angular velocity distribution is double peaked due to a spontaneous symmetry breaking: A convection roll develops in the granular gas, which strongly couples to the rotor. Surprisingly, in this case, similar symmetry relations hold, which lead to a good prediction for the height ratio of the two peaks.
Original languageEnglish
Article number210604
Number of pages5
JournalPhysical review letters
Issue number21
Publication statusPublished - 2012


  • METIS-288415
  • IR-81792


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