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Large fluctuations in driven dissipative media


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Author: Prados Montaño, Antonio
Lasanta Becerra, Antonio
Hurtado Fernández, Pablo Ignacio
Department: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Date: 2011-09-30
Published in: Physical Review Letters, 107 (14), 140601-1-140601-4.
Document type: Article
Abstract: We analyze the fluctuations of the dissipated energy in a simple and general model where dissipation, diffusion, and driving are the key ingredients. The full dissipation distribution, which follows from hydrodynamic fluctuation theory, shows non-Gaussian tails and no negative branch, thus violating the fluctuation theorem as expected from the irreversibility of the dynamics. It exhibits simple scaling forms in the weak- and strong-dissipation limits, with large fluctuations favored in the former case but strongly suppressed in the latter. The typical path associated with a given dissipation fluctuation is also analyzed in detail. Our results, confirmed in extensive simulations, strongly support the validity of hydrodynamic fluctuation theory to describe fluctuating behavior in driven dissipative media.
Cite: Prados, A., Lasanta, A. y Hurtado, P.I. (2011). Large fluctuations in driven dissipative media. Physical Review Letters, 107 (14), 140601-1-140601-4.
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