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.

Nonequilibrium Steady-State Fluctuations in Actively Cooled Resonators / Bonaldi, M; Conti, L; DE GREGORIO, PAOLO MARIO; Rondoni, Lamberto; Vedovato, G; Vinante, A; Bignotto, M; Cerdonio, M; Falferi, P; Liguori, N; Longo, S; Mezzena, R; Ortolan, A; Prodi, G. A; Salemi, F; Taffarello, L; Vitale, S; Zendri, J. P.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 103:(2009), pp. 010601-1-010601-4. [10.1103/PhysRevLett.103.010601]

Nonequilibrium Steady-State Fluctuations in Actively Cooled Resonators

DE GREGORIO, PAOLO MARIO;RONDONI, Lamberto;
2009

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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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2263585
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