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Breakdown of the fluctuation-dissipation relations in granular gases


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Opened Access Breakdown of the fluctuation-dissipation relations in granular gases

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Author: Brey Abalo, José Javier
García de Soria Lucena, María Isabel
Maynar Blanco, Pablo
Department: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Date: 2008-10
Published in: Europhysics Letters, 84 (2), 24002-p1-24002-p5.
Document type: Article
Abstract: A numerical molecular dynamics experiment measuring the two-time correlation function of the transversal velocity field in the homogeneous cooling state of a granular gas modeled as an ensemble of inelastic hard particles is reported. By measuring the decay rate and the amplitude of the correlations, the accuracy of the Landau-Langevin equation of fluctuating hydrodynamics is checked. The results indicate that although a Langevin approach can be valid, the fluctuation-dissipation relation must be modified, since the viscosity parameter appearing in it differs from the usual hydrodynamic shear viscosity.
Cite: Brey Abalo, J.J., García de Soria Lucena, M.I. y Maynar Blanco, P. (2008). Breakdown of the fluctuation-dissipation relations in granular gases. Europhysics Letters, 84 (2), 24002-p1-24002-p5.
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DOI: 10.1209/0295-5075/84/24002

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