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Constraints from growth-rate data on some coupled dark energy models mimicking a ΛCDM expansion

Monthly Notices of the Royal Astronomical Society, ISSN: 1365-2966, Vol: 460, Issue: 2, Page: 1863-1868
2016
  • 10
    Citations
  • 0
    Usage
  • 5
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    10
    • Citation Indexes
      10
  • Captures
    5

Article Description

The ΛCDM expansion can be mimicked by dark energy coupled to matter. In this case, the equation of state w and coupling Q of this coupled dark energy cannot be constrained by observations of the Hubble function alone. In this article, we determine the constraints on two such coupled dark energy models, considering some current and forecast Euclid-like growth-rate data and assuming the prior on the ΛCDM dark matter density parameter today, Ω = 0.295 ± 0.04. The first model is defined by a constant equation of state. We find that, at 2σ, w=-1.02 and the coupling function Q today is QH=0.057-, with H0 the Hubble constant. The second model is defined by a varying equation of state w=w-w ln (1+z), with z the redshift and w ,w ) two constants. We find that, at 2σ, wa=-0.99, w b}=-0.04 and QH=0.0002. These constraints on coupled dark energy agree with a ΛCDM model but are too poor to discard with confidence coupled dark energy different from a vacuum but mimicking a ΛCDM expansion.

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