{
  "id": "1310.1605",
  "version": "v4",
  "published": "2013-10-06T17:17:51.000Z",
  "updated": "2014-11-02T11:30:03.000Z",
  "title": "Limits on anisotropic inflation from the Planck data",
  "authors": [
    "Jaiseung Kim",
    "Eiichiro Komatsu"
  ],
  "comment": "5 pages, 2 figures. (v2) References added. A typo fixed. (v3) Various confidence levels included, Journal reference added (v4) error of a duplicated pdf file fixed",
  "journal": "PRD 88, 101301(R) (2013)",
  "doi": "10.1103/PhysRevD.88.101301",
  "categories": [
    "astro-ph.CO"
  ],
  "abstract": "Temperature anisotropy of the cosmic microwave background offers a test of the fundamental symmetry of spacetime during cosmic inflation. Violation of rotational symmetry yields a distinct signature in the power spectrum of primordial fluctuations as $P({\\mathbf k})=P_0(k)[1+g_*(\\hat{\\mathbf k}\\cdot\\hat{\\mathbf E}_{\\rm cl})^2]$, where $\\hat{\\mathbf E}_{\\rm cl}$ is a preferred direction in space and $g_*$ is an amplitude. Using the \\textit{Planck} 2013 temperature maps, we find no evidence for violation of rotational symmetry, $g_*=0.002\\pm 0.016$ (68% CL), once the known effects of asymmetry of the \\textit{Planck} beams and Galactic foreground emission are removed.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2013-11-27T10:00:04.000Z",
      "comment": "5 pages, 2 figures. (v2) References added. A typo fixed. (v3) Various confidence levels included, Journal reference added"
    },
    {
      "version": "v4",
      "updated": "2014-11-02T11:30:03.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "98.70.Vc",
      "98.80.Cq",
      "98.80.Es"
    ],
    "keywords": [
      "anisotropic inflation",
      "planck data",
      "cosmic microwave background offers",
      "galactic foreground emission",
      "rotational symmetry yields"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review D",
      "year": 2013,
      "month": "Nov",
      "volume": 88,
      "number": 10,
      "pages": 101301
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1265738,
      "adsabs": "2013PhRvD..88j1301K"
    }
  }
}