Breakdown of fluctuation-dissipation relations in granular gases
| Autor: | Brey, J. J., de Soria, M. I. Garcia, Maynar, P. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1209/0295-5075/84/24002 |
| Popis: | 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 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. Comment: 9 pages, 4 figures |
| Databáze: | arXiv |
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