{
  "id": "1104.1137",
  "version": "v2",
  "published": "2011-04-06T16:20:38.000Z",
  "updated": "2013-12-17T05:02:32.000Z",
  "title": "Constraints on the dark energy using multiple observations : snare of principal component analysis",
  "authors": [
    "Seokcheon Lee"
  ],
  "comment": "4 pages, 2 figures, 1 table",
  "categories": [
    "astro-ph.CO"
  ],
  "abstract": "We explore snares in determining the equation of state of dark energy ($\\omega$) when one uses the so-called principal component analysis for multiple observations. We demonstrated drawbacks of principal component analysis in an earlier paper. We used the Hubble parameter data generated from a fiducial model using the so-called Chevallier-Polarski-Linder parameterization. We extend our previous consideration to multiple observations, the Hubble parameter and the luminosity distance. We find that the principal component analysis produces the almost constant $\\omega$ even when a fiducial model is a rapidly varying $\\omega$. Thus, resolution of dynamical property of $\\omega$ through PCA is degraded especially when one fits to several observations.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2013-12-17T05:02:32.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "95.36.+x",
      "95.80.+p",
      "98.80.Es"
    ],
    "keywords": [
      "multiple observations",
      "dark energy",
      "principal component analysis produces",
      "fiducial model",
      "constraints"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 895071,
      "adsabs": "2011arXiv1104.1137L"
    }
  }
}