{
  "id": "1301.4523",
  "version": "v2",
  "published": "2013-01-18T23:31:43.000Z",
  "updated": "2013-02-21T15:53:13.000Z",
  "title": "On the Prompt Signals of Gamma Ray Bursts",
  "authors": [
    "Pisin Chen",
    "Toshi Tajima",
    "Yoshi Takahashi"
  ],
  "comment": "8 pages, 1 figure",
  "journal": "Gamma-Ray Bursts: 15 Years of GRB Afterglows 61, A.J. Castro-Tirado, J. Gorosabel and I.H. Park, ed., p95-102. (2013)",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We introduce a new model of gamma ray burst (GRB) that explains its observed prompt signals, namely, its primary quasi-thermal spectrum and high energy tail. This mechanism can be applied to either assumption of GRB progenitor: coalescence of compact objects or hypernova explosion. The key ingredients of our model are: (1) The initial stage of a GRB is in the form of a relativistic quark-gluon plasma \"lava\"; (2) The expansion and cooling of this lava results in a QCD phase transition that induces a sudden gravitational stoppage of the condensed non-relativistic baryons and form a hadrosphere; (3) Acoustic shocks and Alfven waves (magnetoquakes) that erupt in episodes from the epicenter efficiently transport the thermal energy to the hadrospheric surface and induce a rapid detachment of leptons and photons from the hadrons; (4) The detached $e^+e^-$ and $\\gamma$ form an opaque, relativistically hot leptosphere, which expands and cools to $T \\sim mc^2$, or 0.5 MeV, where $e^+e^- \\to 2\\gamma$ and its reverse process becomes unbalanced, and the GRB photons are finally released; (5) The \"mode-conversion\" of Alfven waves into electromagnetic waves in the leptosphere provides a \"snowplow\" acceleration and deceleration that gives rise to both the high energy spectrum of GRB and the erosion of its thermal spectrum down to a quasi-thermal distribution. According to this model, the observed GRB photons should have a redshifted peak frequency at $E_p \\sim \\Gamma(1 + \\beta/2)mc^2/(1 + z),$ where $\\Gamma\\sim {\\cal{O}}(1)$ is the Lorentz factor of the bulk flow of the lava, which may be determined from the existing GRB data.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2013-02-21T15:53:13.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "gamma ray burst",
      "prompt signals",
      "alfven waves",
      "grb photons",
      "relativistic quark-gluon plasma"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1051/eas/1361015"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1215243,
      "adsabs": "2013EAS....61...95C"
    }
  }
}