{
  "id": "0705.2688",
  "version": "v1",
  "published": "2007-05-18T12:39:46.000Z",
  "updated": "2007-05-18T12:39:46.000Z",
  "title": "Violation of the Einstein relation in Granular Fluids: the role of correlations",
  "authors": [
    "A. Puglisi",
    "A. Baldassarri",
    "A. Vulpiani"
  ],
  "comment": "18 pages, 6 figures, submitted for publication",
  "journal": "J. Stat. Mech. (2007) P08016",
  "doi": "10.1088/1742-5468/2007/08/P08016",
  "categories": [
    "cond-mat.stat-mech",
    "cond-mat.soft"
  ],
  "abstract": "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.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2007-05-18T12:39:46.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "granular fluids",
      "einstein relation",
      "driven granular gases",
      "fluctuation-dissipation relation holds",
      "differential velocity response"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "Journal of Statistical Mechanics: Theory and Experiment",
      "year": 2007,
      "month": "Aug",
      "volume": 2007,
      "number": 8,
      "pages": 8016
    },
    "note": {
      "typesetting": "TeX",
      "pages": 18,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2007JSMTE..08...16P"
    }
  }
}