{
  "id": "0804.2329",
  "version": "v1",
  "published": "2008-04-15T08:40:52.000Z",
  "updated": "2008-04-15T08:40:52.000Z",
  "title": "Breakdown of fluctuation-dissipation relations in granular gases",
  "authors": [
    "J. J. Brey",
    "M. I. Garcia de Soria",
    "P. Maynar"
  ],
  "comment": "9 pages, 4 figures",
  "doi": "10.1209/0295-5075/84/24002",
  "categories": [
    "cond-mat.stat-mech"
  ],
  "abstract": "A numerical molecular dynamics experiment measuring the two-time correlation function of the transversal velocity field in the homogeneous cooling state of a granular gas is reported. By measuring the decay rate and the amplitude of the correlations, the accuracy of the Landau-Langevin equation of fluctuating hydrodynamics is checked. The results indicate that although a Langevin approach can be valid, the fluctuation-dissipation relation must be modified, since the viscosity parameter appearing in it differs from the usual hydrodynamic shear viscosity.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2008-04-15T08:40:52.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "fluctuation-dissipation relation",
      "granular gases",
      "usual hydrodynamic shear viscosity",
      "two-time correlation function",
      "transversal velocity field"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "EPL (Europhysics Letters)",
      "year": 2008,
      "month": "Oct",
      "volume": 84,
      "number": 2,
      "pages": 24002
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2008EL.....8424002B"
    }
  }
}