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dc.contributor.authorRuan, Cheng-Zong
dc.contributor.authorMelia, Fulvio
dc.contributor.authorChen, Yu
dc.contributor.authorZhang, Tong-Jie
dc.date.accessioned2019-09-25T23:43:49Z
dc.date.available2019-09-25T23:43:49Z
dc.date.issued2019-08-21
dc.identifier.citationCheng-Zong Ruan et al 2019 ApJ 881 137en_US
dc.identifier.issn0004-637X
dc.identifier.doi10.3847/1538-4357/ab2ed0
dc.identifier.urihttp://hdl.handle.net/10150/634583
dc.description.abstractWe present a model-independent measurement of spatial curvature Omega(k) in the Friedmann-Lemaitre-Robertson-Walker universe, based on observations of the Hubble parameter H(z) using cosmic chronometers, and a Gaussian process (GP) reconstruction of the H II galaxy Hubble diagram. We show that the imposition of spatial flatness (i.e., Omega(k) - 0) easily distinguishes between the Hubble constant measured with Planck and that based on the local distance ladder. We find an optimized curvature parameter Omega(k) = -0.120(-0.147)(+0.168) when using the former (i.e., H-0 = 67.66 +/- 0.42 km s(-1) Mpc(-1)), and Omega(k) = -0.298(-0.088)(+0.122) for the latter (H-0 = 73.24 +/- 1.74 km s(-1) Mpc(-1)). The quoted uncertainties are extracted by Monte Carlo sampling, taking into consideration the covariances between the function and its derivative reconstructed by GP. These data therefore reveal that the condition of spatial flatness favors the Planck measurement, while ruling out the locally inferred Hubble constant as a true measure of the large-scale cosmic expansion rate at a confidence level of similar to 3 sigma.en_US
dc.description.sponsorshipNational Key R&D Program of China [2017YFA0402600]; National Science Foundation of China [11573006, 11528306]; Fundamental Research Funds for the Central Universities; Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Funden_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.rightsCopyright © 2019. The American Astronomical Society.en_US
dc.subjectcosmological parametersen_US
dc.subjectdistance scaleen_US
dc.titleUsing Spatial Curvature with H II Galaxies and Cosmic Chronometers to Explore the Tension in H 0en_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Dept Phys, Appl Math Programen_US
dc.contributor.departmentUniv Arizona, Dept Astronen_US
dc.identifier.journalASTROPHYSICAL JOURNALen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.volume881
dc.source.issue2
dc.source.beginpage137
refterms.dateFOA2019-09-25T23:43:50Z


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