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HUBBLE PARAMETER MEASUREMENT CONSTRAINTS ON DARK ENERGY

Omer Farooq, Data Mania, Bharat Ratra · 2013 · 88 citationsRead the paper

We use 21 Hubble parameter versus redshift data points from Simon et al., Gaztañaga et al., Stern et al., and Moresco et al. to place constraints on model parameters of constant and time-evolving dark energy cosmologies. The inclusion of the eight new measurements results in H ( z ) constraints more restrictive than those derived by Chen & Ratra. These constraints are now almost as restrictive as those that follow from current Type Ia supernova (SNIa) apparent magnitude versus redshift data, which now more carefully account for systematic uncertainties. This is a remarkable result. We emphasize, however, that SNIa data have been studied for a longer time than the H ( z ) data, possibly resulting in a better estimate of potential systematic errors in the SNIa case. A joint analysis of the H ( z ), baryon acoustic oscillation peak length scale, and SNIa data favors a spatially flat cosmological model currently dominated by a time-independent cosmological constant but does not exclude slowly evolving dark energy.

What the full text shows

Theory or simulation
  • Joint analysis of H(z), BAO, and SNIa data favors a spatially-flat cosmological model dominated by a time-independent cosmological constant. (Joint analysis of H(z), BAO, and SNIa data)
  • H(z) constraints on dark energy model parameters are now nearly as restrictive as those from SNIa apparent magnitude versus redshift data. (Using 21 Hubble parameter versus redshift data points)
  • The inclusion of 8 new measurements from Moresco et al. (2012a) produced more restrictive H(z) constraints than previous results by Chen & Ratra. (H(z) data analysis)
Setup
21 Hubble parameter versus redshift data points from Simon et al., Gaztañaga et al., Stern et al., and Moresco et al.
How
The authors performed a joint statistical analysis of Hubble parameter (H(z)), baryon acoustic oscillation (BAO), and Type Ia supernova (SNIa) data to constrain parameters for ΛCDM, XCDM, and φCDM models.
Limitations
Current data quality is insufficient to strongly rule out slowly-evolving dark energy density. · Potential systematic errors in H(z) data may be less understood than those in SNIa data.

Summarized by Gemma 4 from the open-access full text · 7 Oct 2026. Read it