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The growth index of matter perturbations and modified gravity

Monthly Notices of the Royal Astronomical Society, ISSN: 1365-2966, Vol: 423, Issue: 4, Page: 3761-3767
2012
  • 35
    Citations
  • 0
    Usage
  • 13
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    35
    • Citation Indexes
      35
  • Captures
    13

Article Description

We place tight constraints on the growth index γ by using the recent growth history results of 2 degree Field Galaxy Redshift Survey (2dFGRS), Sloan Digital Sky Survey luminous red galaxy (SDSS-LRG), VIMOS-VLT Deep Survey (VVDS) and WiggleZ data sets. In particular, we investigate several parametrizations of the growth index γ(z) by comparing their cosmological evolution using observational growth rate data at different redshifts. Utilizing a standard likelihood analysis we find that the use of the combined growth data provided by the 2dFGRS, SDSS-LRG, VVDS and WiggleZ galaxy surveys puts the most stringent constraints on the value of the growth index. As an example, assuming a constant growth index we obtain that γ= 0.602 ± 0.055 for the concordance Λ cold dark matter (ΛCDM) expansion model. Concerning the Dvali-Gabadadze-Porrati (DGP) gravity model, we find γ= 0.503 ± 0.06, which is lower and almost 3σ away from the theoretically predicted value of Finally, based on a time varying growth index we also confirm that the combined growth data disfavour the DGP gravity. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.

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