{
  "id": "1011.2672",
  "version": "v2",
  "published": "2010-11-11T14:50:31.000Z",
  "updated": "2011-06-21T05:43:39.000Z",
  "title": "Origin of the Ultrahigh-Energy Cosmic Rays and their Spectral Break",
  "authors": [
    "Shlomo Dado",
    "Arnon Dar",
    "A. De Rujula"
  ],
  "comment": "Invited talk presentet by A. Dar at the Rencontre de La Thuile, 2011. To be published in Nuovo Cimento",
  "journal": "Il Nuovo Cimento C 35, 01 (2012)",
  "categories": [
    "astro-ph.HE",
    "hep-ph"
  ],
  "abstract": "The energy spectrum, composition and arrival directions of ultrahigh energy cosmic rays (UHECRs) with energy above the cosmic ray ankle, measured by the Pierre Auger Observatory, are inconsistent if their origin is assumed to be extragalactic. Their observed properties, however, are those expected from UHECRs accelerated by the highly relativistic jets emitted in Galactic gamma ray bursts, most of which are beamed away from Earth. If this alternative interpretation is correct, the observed break in the energy spectrum of UHECRs around 50 EeV is not the Greisen-Zatsepin-Kuzmin cutoff but the energy threshold for free escape of ultrahigh energy iron cosmic rays from the Galaxy and above their respective free-escape threshold-energies, UHECR nuclei should point back to their Galactic sources or their remnants rather than to active galactic nuclei (AGN) within the GZK horizon.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2011-06-21T05:43:39.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "95.85.Pw",
      "95.85.Ry"
    ],
    "keywords": [
      "ultrahigh-energy cosmic rays",
      "spectral break",
      "ultrahigh energy iron cosmic rays",
      "ultrahigh energy cosmic rays",
      "energy spectrum"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1393/ncc/i2012-11126-8"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 877038,
      "adsabs": "2010arXiv1011.2672D"
    }
  }
}