摘要翻译：
我们研究了不同模型下驱动颗粒气体的线性响应。在某些情况下，即使速度统计量可以是强非高斯的，我们也没有观察到明显违反爱因斯坦扩散-迁移率公式的现象。当速度和密度之间存在强相关时，情况发生了变化：在这种情况下，尽管涨落-耗散关系形式成立，但粒子的微分速度响应与其速度自相关不再成正比。这发生在高密度和强烈的无弹性，但仍然在流体样（和遍历）的情况下。
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英文标题：
《Violation of the Einstein relation in Granular Fluids: the role of
  correlations》
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作者：
A. Puglisi, A. Baldassarri and A. Vulpiani
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最新提交年份：
2007
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分类信息：

一级分类：Physics        物理学
二级分类：Statistical Mechanics        统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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一级分类：Physics        物理学
二级分类：Soft Condensed Matter        软凝聚态物质
分类描述：Membranes, polymers, liquid crystals, glasses, colloids, granular matter
膜，聚合物，液晶，玻璃，胶体，颗粒物质
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英文摘要：
  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.
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PDF链接：
https://arxiv.org/pdf/705.2688