Nonequilibrium Steady-State Fluctuations in Actively Cooled Resonators

Bonaldi, M.; Conti, L.; De Gregorio, P.; Rondoni, L.; Vedovato, G.; Vinante, A.; Bignotto, M.; Cerdonio, M.; Falferi, P.; Liguori, N.

doi:10.1103/PhysRevLett.103.010601

Nonequilibrium Steady-State Fluctuations in Actively Cooled Resonators

2009

Published in:

Phys.Rev.Lett. 103 (2009) 1, 010601

DOI:

10.1103/PhysRevLett.103.010601

Experiments:

AURIGA

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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.

fluctuation: measured
gravitational radiation detector
statistical mechanics
experimental results
oscillator
feedback
viscosity
asymmetry

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