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Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Feb;87(2):022112. Epub 2013 Feb 13.

Power fluctuation theorem for a Brownian harmonic oscillator.

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  • 1Departamento de Física, Universidad Autónoma Metropolitana-Iztapalapa, 09340 México, D.F., Mexico.


In this paper we study the validity of the total power fluctuation theorem spent on a Brownian harmonic oscillator when the system is driven out of equilibrium through the drag of the potential minimum. The theorem is first proved for an ordinary harmonic oscillator in two cases: The first one considers the particle in a thermal bath under the action of Gaussian white noise, and in the second one the drift is provided by an additional external Gaussian colored noise satisfying the characteristics of an Ornstein-Uhlenbeck process. We go further, by considering a charged harmonic oscillator under the action of an electromagnetic field. The theorem is also proven as in the two cases given above. In both of those cases, we illustrate the theorem for a uniform motion of the trap potential minimum and show that in the presence of external colored noise, the theorem is only valid in the stationary state.

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