{
  "id": "1507.08798",
  "version": "v1",
  "published": "2015-07-31T08:38:13.000Z",
  "updated": "2015-07-31T08:38:13.000Z",
  "title": "Shear and Bulk Viscosities of Quark Matter from Quark-Meson Fluctuations in the Nambu--Jona-Lasinio model",
  "authors": [
    "Sabyasachi Ghosh",
    "Thiago C. Peixoto",
    "Victor Roy",
    "Fernando E. Serna",
    "Gastão Krein"
  ],
  "comment": "9 pages, 10 figures",
  "categories": [
    "nucl-th",
    "hep-ph"
  ],
  "abstract": "We have calculated the temperature dependence of shear $\\eta$ and bulk $\\zeta$ viscosities of quark matter due to quark-meson fluctuations. The quark thermal width originating from quantum fluctuations of quark-$\\pi$ and quark-$\\sigma$ loops at finite temperature is calculated with the formalism of real-time thermal field theory. Temperature-dependent constituent-quark and meson masses, and quark-meson couplings are obtained in the Nambu--Jona-Lasinio model. We found a non-trivial influence of the temperature-dependent masses and couplings on the Landau-cut structure of the quark self-energy. Our results for the ratios $\\eta/s$ and $\\zeta/s$, where $s$ is the entropy density (also determined in the Nambu--Jona-Lasinio model in the quasi-particle approximation), are in fair agreement with results of the literature obtained from different models and techniques. In particular, our result for $\\eta/s$ has a minimum very close to the conjectured AdS/CFT lower bound, $\\eta/s = 1/4\\pi$.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-07-31T08:38:13.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "nambu-jona-lasinio model",
      "quark matter",
      "quark-meson fluctuations",
      "bulk viscosities",
      "real-time thermal field theory"
    ],
    "publication": {
      "doi": "10.1103/PhysRevC.93.045205"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1385890
    }
  }
}