{
  "id": "0905.2738",
  "version": "v2",
  "published": "2009-05-17T13:32:41.000Z",
  "updated": "2009-10-23T06:42:57.000Z",
  "title": "Constraints on the Phase Plane of the Dark Energy Equation of State",
  "authors": [
    "Chien-Wen Chen",
    "Pisin Chen",
    "Je-An Gu"
  ],
  "comment": "14 pages, 5 figures, \"Test of the method\" added in Sec. 4 in v2",
  "journal": "Phys.Lett.B682:267-273,2009",
  "doi": "10.1016/j.physletb.2009.10.092",
  "categories": [
    "astro-ph.CO"
  ],
  "abstract": "Classification of dark energy models in the plane of w and w', where w is the dark energy equation of state and w' its time-derivative in units of the Hubble time, has been studied in the literature. We take the current SN Ia, CMB and BAO data, invoke a widely used parametrization of the dark energy equation of state, and obtain the constraints on the w -w' plane. We find that dark energy models including the cosmological constant, phantom, non-phantom barotropic fluids, and monotonic up-rolling quintessence are ruled out at the 68.3% confidence level based on the current observational data. Down-rolling quintessence, including the thawing and the freezing models, is consistent with the current observations. All the above-mentioned models are still consistent with the data at the 95.4% confidence level.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2009-10-23T06:42:57.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "95.36.+x"
    ],
    "keywords": [
      "dark energy equation",
      "phase plane",
      "dark energy models",
      "constraints",
      "confidence level"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "Physics Letters B",
      "year": 2009,
      "month": "Dec",
      "volume": 682,
      "number": 3,
      "pages": 267
    },
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 820691,
      "adsabs": "2009PhLB..682..267C"
    }
  }
}