Utility of observational Hubble parameter data on dark energy evolution

2015/07/09 by Xiao-Lei Meng, Meng, Xiao-Lei, Xin Wang +5 · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #astro-ph.CO

paper · pdf · doi:10.48550/arxiv.1507.02517

8 pages, 6 figures

arxiv created 2015/07/09 · openalex publication_date 2015/07/09 · arxiv updated 2015/07/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

Abstract

Aiming at exploring the nature of dark energy, we use thirty-six observational Hubble parameter data (OHD) in the redshift range 0 \leqslant z \leqslant 2.36 to make a cosmological model-independent test of the two-point Omh²(z₂;z₁) diagnostic. In ΛCDM, we have Omh² ≡ Ω_mh², where Ω_m is the matter density parameter at present. We bin all the OHD into four data points to mitigate the observational contaminations. By comparing with the value of Ω_mh² which is constrained tightly by the Planck observations, our results show that in all six testing pairs of Omh² there are two testing pairs are consistent with ΛCDM at 1σ confidence level (CL), whereas for another two of them ΛCDM can only be accommodated at 2σ CL. Particularly, for remaining two pairs, ΛCDM is not compatible even at 2σ CL. Therefore it is reasonable that although deviations from ΛCDM exist for some pairs, cautiously, we cannot rule out the validity of ΛCDM. We further apply two methods to derive the value of Hubble constant H₀ utilizing the two-point Omh²(z₂;z₁) diagnostic. We obtain H₀ = 71.23±1.54 \mathrmkm s^-1 Mpc^-1 from inverse variance weighted Omh² value (method (I)) and H₀ = 69.37±1.59 \mathrmkm s^-1 Mpc^-1 that the Omh² value originates from Planck measurement (method (II)), both at 1σ CL. Finally, we explore how the error in OHD propagate into w(z) at certain redshift during the reconstruction of w(z). We argue that the current precision on OHD is not sufficient small to ensure the reconstruction of w(z) in an acceptable error range, especially at the low redshift

Cited by

• Cosmological model-independent test of ΛCDM with two-point diagnostic by the observational Hubble parameter data
• Observational constraints on f(T) gravity from varying fundamental constants

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