https://hal-ens-lyon.archives-ouvertes.fr/ensl-00691711Joubaud, SylvainSylvainJoubaudPhys-ENS - Laboratoire de Physique de l'ENS Lyon - ENS Lyon - École normale supérieure - Lyon - UCBL - Université Claude Bernard Lyon 1 - Université de Lyon - CNRS - Centre National de la Recherche ScientifiqueUniversity of TwenteLohse, DetlefDetlefLohseUniversity of Twentevan Der Meer, DevarajDevarajvan Der MeerUniversity of TwenteFluctuation theorems for an asymmetric rotor in a granular gasHAL CCSD2012[PHYS.COND.CM-SM] Physics [physics]/Condensed Matter [cond-mat]/Statistical Mechanics [cond-mat.stat-mech]Joubaud, Sylvain2012-04-26 21:34:072023-03-24 14:52:552012-04-27 09:53:42enJournal articleshttps://hal-ens-lyon.archives-ouvertes.fr/ensl-00691711/document10.1103/PhysRevLett.108.210604application/pdf1We 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.