Towards to H_0 Tension by the Theoretical Hubble Parameter in the Infinite Future release_v5r774iu3fgjvjyxg4ecsraqju

by Che-Qiu Lyu, Tong-Jie Zhang

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2019  

Abstract

There exists a constant value of H(z) at z=-1 when in ωCDM universe with ω > -1, which is independent on other cosmological parameters. We first combine this theoretical H(z) value with the latest 43 observational H(z) data (OHD) to perform the model-independent Gaussian Processes (GP) and constrain the Hubble constant. We obtain H_0=67.67±3.03 km s^-1 Mpc^-1, which is in agreement with H_0 values from Plank Collaboration (2015) (0.24 σ tension) but a larger deviation from Riess et al. (2016) (1.60 σ tension), while H_0=71.09 ±3.71 km s^-1 Mpc^-1(0.64 σ tension) by only using latest 43 OHD. Using this H_0 value, we perform χ^2 statistics with Markov Chain Monte Carlo (MCMC) method to constrain cosmological parameters. We obtain Ω_M=0.26 ± 0.02 and ω=-0.85 ± 0.06 in flat ω CDM model, and Ω_M=0.27± 0.04 , Ω_Λ=0.80 ± 0.12 and ω=-0.82 ± 0.07 in non-flat ω CDM model, which are larger than those not using the theoretical H(z) value.
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Type  article
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Date   2019-05-31
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arXiv  1905.13431v1
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