{
  "id": "1308.6769",
  "version": "v2",
  "published": "2013-08-30T15:23:34.000Z",
  "updated": "2013-11-21T16:31:44.000Z",
  "title": "Parity violation in the CMB bispectrum by a rolling pseudoscalar",
  "authors": [
    "Maresuke Shiraishi",
    "Angelo Ricciardone",
    "Shohei Saga"
  ],
  "comment": "19 pages, 5 figures. Accepted for publication in JCAP",
  "journal": "JCAP11(2013)051",
  "doi": "10.1088/1475-7516/2013/11/051",
  "categories": [
    "astro-ph.CO",
    "gr-qc",
    "hep-ph",
    "hep-th"
  ],
  "abstract": "We investigate parity-violating signatures of temperature and polarization bispectra of the cosmic microwave background (CMB) in an inflationary model where a rolling pseudoscalar produces large equilateral tensor non-Gaussianity. By a concrete computation based on full-sky formalism, it is shown that resultant CMB bispectra have nonzero signals in both parity-even $(\\ell_1 + \\ell_2 + \\ell_3 = {\\rm even})$ and parity-odd $(\\ell_1 + \\ell_2 + \\ell_3 = {\\rm odd})$ spaces, and are almost uncorrelated with usual scalar-mode equilateral bispectra. These characteristic signatures and polarization information help to detect such tensor non-Gaussianity. Use of both temperature and E-mode bispectra potentially improves of $400\\%$ the detectability with respect to an analysis with temperature bispectrum alone. Considering B-mode bispectrum, the signal-to-noise ratio may be able to increase by 3 orders of magnitude. We present the $1\\sigma$ uncertainties of a parameter depending on a coupling constant and a rolling condition for the pseudoscalar expected in the ${\\it Planck}$ and the proposed PRISM experiments.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2013-11-21T16:31:44.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cmb bispectrum",
      "rolling pseudoscalar",
      "parity violation",
      "pseudoscalar produces large equilateral tensor",
      "produces large equilateral tensor non-gaussianity"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "IOP",
      "journal": "Journal of Cosmology and Astro-Particle Physics",
      "year": 2013,
      "month": "Nov",
      "volume": 2013,
      "number": 11,
      "pages": "051"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 19,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1251884,
      "adsabs": "2013JCAP...11..051S"
    }
  }
}