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  • Title: Nonequilibrium steady-state fluctuations in actively cooled resonators.
    Author: Bonaldi M, Conti L, De Gregorio P, Rondoni L, Vedovato G, Vinante A, Bignotto M, Cerdonio M, Falferi P, Liguori N, Longo S, Mezzena R, Ortolan A, Prodi GA, Salemi F, Taffarello L, Vitale S, Zendri JP.
    Journal: Phys Rev Lett; 2009 Jul 03; 103(1):010601. PubMed ID: 19659131.
    Abstract:
    We analyze heat and work fluctuations in the gravitational wave detector AURIGA, modeled as a macroscopic electromechanical oscillator in contact with a thermostat and cooled by an active feedback system. The oscillator is driven to a steady state by the feedback cooling, equivalent to a viscous force. The experimentally measured fluctuations are in agreement with our theoretical analysis based on a stochastically driven Langevin system. The asymmetry of the fluctuations of the absorbed heat characterizes the oscillator's nonequilibrium steady state and reveals the extent to which a feedback cooled system departs from equilibrium in a statistical mechanics perspective.
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