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  • Title: Fluctuation theorems for an asymmetric rotor in a granular gas.
    Author: Joubaud S, Lohse D, van der Meer D.
    Journal: Phys Rev Lett; 2012 May 25; 108(21):210604. PubMed ID: 23003232.
    Abstract:
    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.
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