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1 Phys-ENS - Laboratoire de Physique de l-ENS Lyon 2 University of Twente Netherlands

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.





Author: Sylvain Joubaud - Detlef Lohse - Devaraj Van Der Meer -

Source: https://hal.archives-ouvertes.fr/



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