Violation of the Einstein relation in Granular Fluids: the role of correlations
نویسنده
چکیده
We study the linear response in different models of driven granular gases. In some situations, even if the 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 more proportional. This happens at high densities and strong inelasticities, but still in the fluid-like (and ergodic) regime. Violation of the Einstein relation in Granular Fluids: the role of correlations 2
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تاریخ انتشار 2008