{
  "id": "1712.06205",
  "version": "v1",
  "published": "2017-12-17T23:13:00.000Z",
  "updated": "2017-12-17T23:13:00.000Z",
  "title": "No axion-like particles from core-collapse supernovae?",
  "authors": [
    "Giorgio Galanti",
    "Marco Roncadelli",
    "Roberto Turolla"
  ],
  "comment": "5 pages, 1 figure",
  "categories": [
    "astro-ph.HE",
    "hep-ph"
  ],
  "abstract": "A strong bound on the properties of axion-like particles (ALPs) has been set by assuming that ALPs are emitted by the proto-neutron star just before the bounce in Galactic core-collapse supernovae, and that these ALPs subsequently convert to $\\gamma$-ray photons which ought to be detected by a $\\gamma$-ray mission. This argument has been applied to supernova 1987A to derive the bound on the ALP-photon coupling $g_{a \\gamma \\gamma} \\lesssim 5.3 \\cdot 10^{- 12} \\, {\\rm GeV}^{- 1}$ for an ALP mass $m_a \\lesssim 4.4 \\cdot 10^{- 10} \\, {\\rm eV}$, and can be applied to the next Galactic supernova to derive the even stronger bound $g_{a \\gamma \\gamma} \\lesssim 2 \\cdot 10^{- 13} \\, {\\rm GeV}^{- 1}$ for an ALP mass $m_a \\lesssim 10^{- 9} \\, {\\rm eV}$. We carefully analyze the considered ALP production mechanism and find that it is oversimplified to an unacceptable extent. By taking into account the minimal ingredients required by a realistic analysis, we conclude that the previous results are doomed to failure. As a consequence, all papers quoting the above bound should be properly revised. Yet, since we are unable to rule out the possibility that proto-neutron stars emit ALPs, in case a core-collapse supernova explodes in the Galaxy the $\\gamma$-ray satellite missions active at that time should look for photons possibly coming from the supernova.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-12-17T23:13:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "axion-like particles",
      "alp mass",
      "proto-neutron stars emit alps",
      "alp production mechanism",
      "galactic core-collapse supernovae"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}