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Journal Articles Physical Review Letters Year : 2012

Fluctuation theorems for an asymmetric rotor in a granular gas

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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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ensl-00691711 , version 1 (26-04-2012)

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Sylvain Joubaud, Detlef Lohse, Devaraj van Der Meer. Fluctuation theorems for an asymmetric rotor in a granular gas. Physical Review Letters, 2012, 108, pp.210604. ⟨10.1103/PhysRevLett.108.210604⟩. ⟨ensl-00691711⟩
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