A Puglisi et al J. Stat. Mech. (2007) P08016 doi:10.1088/1742-5468/2007/08/P08016
A Puglisi1, A Baldassarri1 and A Vulpiani2
Show affiliationsWe study the linear response in different models of driven granular gases. In some situations, even if the velocity statistics can be strongly non-Gaussian, we do not observe appreciable violations of the Einstein formula for diffusion versus mobility. The situation changes when strong correlations between velocities and density are present: in this case, although a form of fluctuation-dissipation relation holds, the differential velocity response of a particle and its velocity self-correlation are no longer proportional. This happens at high densities and strong inelasticities, but still in the fluid-like (and ergodic) regime.
51.10.+y Kinetic and transport theory of gases
Issue 08 (August 2007)
Received 18 May 2007, accepted for publication 2 July 2007
Published 6 August 2007
A Puglisi et al J. Stat. Mech. (2007) P08016
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