Bayesian correction of H(z) data uncertainties

Abstract We compile 41 H(z) data from literature and use them to constrain OΛCDM and flat ΛCDM parameters. We show that the available H(z) suffers from uncertainties overestimation and propose a Bayesian method to reduce them. As a result of this method, using H(z) only, we find, in the context of O...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2018-07, Vol.477 (3), p.2867-2873
Main Authors: Jesus, J F, Gregório, T M, Andrade-Oliveira, F, Valentim, R, Matos, C A O
Format: Article
Language:English
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Summary:Abstract We compile 41 H(z) data from literature and use them to constrain OΛCDM and flat ΛCDM parameters. We show that the available H(z) suffers from uncertainties overestimation and propose a Bayesian method to reduce them. As a result of this method, using H(z) only, we find, in the context of OΛCDM, H0 = 69.5 ± 2.5 km s−1 Mpc−1, Ωm = 0.242 ± 0.036, and $\Omega _\Lambda =0.68\pm 0.14$. In the context of flat ΛCDM model, we have found H0 = 70.4 ± 1.2 km s−1 Mpc−1 and Ωm = 0.256 ± 0.014. This corresponds to an uncertainty reduction of up to ${\approx }30\hbox{ per cent}$ when compared to the uncorrected analysis in both cases.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/sty813