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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2019
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| Sujets: | |
| Accès en ligne: | https://arxiv.org/abs/1905.13431 |
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- In the realm of the $ω$CDM 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 $H_0=64.89\pm4.68\ {\rm km\ s^{-1} Mpc^{-1}}$, markedly inferior to the $H_0$ estimate posited by the Planck Collaboration (2018) (exhibiting a tension of $0.53σ$), and substantially less than that of \cite{Riess2016A} (manifesting a tension of $1.67σ$). Conversely, when solely utilizing the latest 35 OHD, the inferred $H_0=68.77\pm6.24\ {\rm km\ s^{-1} Mpc^{-1}}$ (with a tension of $0.50σ$). Leveraging this derived $H_0$, we subsequently engage in $χ^2$ statistics via the Markov Chain Monte Carlo (MCMC) technique to constrain cosmological parameters. Within the flat $ω$CDM model, we deduce $Ω_M=0.32\pm0.02$ and $ω=-0.80\pm0.05$, whereas in the non-flat $ω$CDM model, we ascertain $Ω_M=0.34\pm0.05$, $Ω_Λ=0.76\pm0.12$, and $ω=-0.78\pm0.07$, magnitudes surpassing those obtained sans the incorporation of theoretical $H(z)$ values.