Hubble Parameter and Baryon Acoustic Oscillation Measurement Constraints on the Hubble Constant, the Deviation from the Spatially Flat ΛCDM Model, the Deceleration-Acceleration Transition Redshift, and Spatial Curvature

We compile a complete collection of reliable Hubble parameter H(z) data to redshift z ≤ 2.36 and use them with the Gaussian Process method to determine continuous H(z) functions for various data subsets. From these continuous H(z)'s, summarizing across the data subsets considered, we find H0 ∼...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 856; no. 1; pp. 3 - 13
Main Authors Yu, Hai, Ratra, Bharat, Wang, Fa-Yin
Format Journal Article
LanguageEnglish
Published Philadelphia The American Astronomical Society 20.03.2018
IOP Publishing
Institute of Physics (IOP)
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Summary:We compile a complete collection of reliable Hubble parameter H(z) data to redshift z ≤ 2.36 and use them with the Gaussian Process method to determine continuous H(z) functions for various data subsets. From these continuous H(z)'s, summarizing across the data subsets considered, we find H0 ∼ 67 4 km s−1 Mpc−1, more consistent with the recent lower values determined using a variety of techniques. In most data subsets, we see a cosmological deceleration-acceleration transition at 2 significance, with the data subsets transition redshifts varying over at 1 significance. We find that the flat-ΛCDM model is consistent with the H(z) data to a z of 1.5 to 2.0, depending on data subset considered, with 2 deviations from flat-ΛCDM above this redshift range. Using the continuous H(z) with baryon acoustic oscillation distance-redshift observations, we constrain the current spatial curvature density parameter to be , consistent with a flat universe, but the large error bar does not rule out small values of spatial curvature that are now under debate.
Bibliography:Galaxies and Cosmology
AAS08168
SC0011840
National Basic Research Program of China
China Scholarship Council
USDOE Office of Science (SC), High Energy Physics (HEP)
National Natural Science Foundation of China (NSFC)
ISSN:0004-637X
1538-4357
1538-4357
DOI:10.3847/1538-4357/aab0a2