Violation of the Einstein relation in Granular Fluids: the role of correlationsReportar como inadecuado



 Violation of the Einstein relation in Granular Fluids: the role of correlations


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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.



Autor: A. Puglisi; A. Baldassarri; A. Vulpiani

Fuente: https://archive.org/







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