Nonequilibrium steady state fluctuations in actively cooled resonators

Details Nonequilibrium steady state fluctuations in actively cooled resonators Nonequilibrium steady state fluctuations in actively cooled resonators

2009-06-15

arxiv.org/abs/0906.2705v1

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

Physics

Condensed Matter

Statistical Mechanics

to be published in Phys. Rev. Lett

Scientific paper

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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