2019/05/31 by Lyu, Cheqiu, Hong, Wei, Zhang, Tong-Jie
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences
paper · doi:10.48550/arxiv.1905.13431
In the realm of the ωCDM cosmological model with quiescence or quintessence as the dark energy, characterized by ω>-1, there exists a fixed value of H(z) at z=-1, devoid of dependency on other cosmological parameters. To constrain the Hubble constant, we amalgamated this theoretical H(z) value with the latest 35 observational H(z) data (OHD) using a Gaussian Process (GP) approach that is unrelated to cosmological models but intertwined with kernel functions. Within such a specialized cosmological paradigm, our scrutiny yields H0=64.89±4.68 \rm km s-1 Mpc-1, markedly inferior to the H0 estimate posited by the Planck Collaboration (2018) (exhibiting a tension of 0.53σ), and substantially less than that of \citeRiess2016A (manifesting a tension of 1.67σ). Conversely, when solely utilizing the latest 35 OHD, the inferred H0=68.77±6.24 \rm km s-1 Mpc-1 (with a tension of 0.50σ). Leveraging this derived H0, we subsequently engage in χ2 statistics via the Markov Chain Monte Carlo (MCMC) technique to constrain cosmological parameters. Within the flat ωCDM model, we deduce ΩM=0.32±0.02 and ω=-0.80±0.05, whereas in the non-flat ωCDM model, we ascertain ΩM=0.34±0.05, ΩΛ=0.76±0.12, and ω=-0.78±0.07, magnitudes surpassing those obtained sans the incorporation of theoretical H(z) values.