{
  "id": "1204.3393",
  "version": "v2",
  "published": "2012-04-16T08:05:09.000Z",
  "updated": "2014-08-24T12:15:45.000Z",
  "title": "Constraints of Dark Energy at High Redshift",
  "authors": [
    "Qiping Su",
    "Rong-Gen Cai"
  ],
  "comment": "3 figures, 6 tables, data are updated",
  "categories": [
    "astro-ph.CO",
    "gr-qc"
  ],
  "abstract": "Constrains of dark energy (DE) at high redshift from current and mock future observational data are obtained. It is found that present data give poor constraints of DE even beyond redshift z=0.4, and mock future 2298 type Ia supernove data only give a little improvement of the constraints. We analyze in detail why constraints of DE decrease rapidly with the increasing of redshift. Then we try to improve the constraints of DE at high redshift. It is shown that the most efficient way is to improve the error of observations.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2012-04-16T08:05:09.000Z",
      "title": "Limitations in Determining Equation of State of Dark Energy at High Redshift",
      "abstract": "By dividing the redshift region under consideration into two bins, we estimate the limitations in determining the equation of state $w_{de}$ of dark energy at high redshift from current and future observational data including supernovae, baryon acoustic oscillation and observational Hubble data. It is found that the constraints of $w_{de}$ from current data are weak (2$\\sigma(w_{de})\\sim1$) even beyond redshift $z=0.3$. For simulated future observational data, it is shown that $\\sim2300$ supernovae data from a SANP-like JDEM survey give $2\\sigma(w_{de})\\sim1$ beyond $z=0.6$. We consider the effects of the divided point, the number of supernovae data and the error in the distance modulus on constraining $w_{de}$ at high redshift. It is shown that the increase of number of supernovae data seems not efficient on improving the constraints of $w_{de}$ at high redshift, while the improvement of observational error in distance modulus seems to be a better way.",
      "comment": "14 pages, 5 figures, 7 tables",
      "journal": null,
      "doi": null
    },
    {
      "version": "v2",
      "updated": "2014-08-24T12:15:45.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "high redshift",
      "dark energy",
      "type ia supernove data",
      "observational data",
      "poor constraints"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1110954,
      "adsabs": "2012arXiv1204.3393S"
    }
  }
}