{
  "id": "1404.3467",
  "version": "v2",
  "published": "2014-04-14T06:28:15.000Z",
  "updated": "2014-05-02T06:18:12.000Z",
  "title": "Constraints on the extensions to the base $Λ$CDM model from BICEP2, Planck and WMAP",
  "authors": [
    "Cheng Cheng",
    "Qing-Guo Huang",
    "Wen Zhao"
  ],
  "comment": "6 pages, 3 figures; minor revised and refs added",
  "journal": "Sci China-Phys Mech Astron, 57(8), 1460 (2014)",
  "categories": [
    "astro-ph.CO",
    "gr-qc",
    "hep-ph",
    "hep-th"
  ],
  "abstract": "Recently Background Imaging of Cosmic Extragalactic Polarization (B2) discovered the relic gravitational waves at $7.0\\sigma$ confidence level. However, the other cosmic microwave background (CMB) data, for example Planck data released in 2013 (P13), prefer a much smaller amplitude of the primordial gravitational waves spectrum if a power-law spectrum of adiabatic scalar perturbations is assumed in the six-parameter $\\Lambda$CDM cosmology. In this paper, we explore whether the $w$CDM model and the running spectral index can relax the tension between B2 and other CMB data. In particular, we find that a positive running of running of spectral index is preferred at $1.7\\sigma$ level from the combination of B2, P13 and WMAP Polarization data.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2014-05-02T06:18:12.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cdm model",
      "constraints",
      "spectral index",
      "extensions",
      "primordial gravitational waves spectrum"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1007/s11433-014-5514-1",
      "journal": "Science China Physics, Mechanics, and Astronomy",
      "year": 2014,
      "month": "Aug",
      "volume": 57,
      "number": 8,
      "pages": 1460
    },
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1290303,
      "adsabs": "2014SCPMA..57.1460C"
    }
  }
}