Breakdown of fluctuation-dissipation relations in granular gases
arXiv:0804.2329 · doi:10.1209/0295-5075/84/24002
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 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.
9 pages, 4 figures
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Cited by in corpus (9)
- Temperature in and out of equilibrium: a review of concepts, tools and attempts
- Granular Brownian motion
- Fluctuating hydrodynamics and correlation lengths in a driven granular fluid
- Nonlinear driven diffusive systems with dissipation: fluctuating hydrodynamics
- Fluctuating hydrodynamics for dilute granular gases
- Fluctuating hydrodynamics for driven granular gases
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- Fluctuating hydrodynamics in a vertically vibrated granular fluid with gravity