2018/02/15 by Fulvio Melia, Manoj K. Yennapureddy · 47 citations
Physics and Astronomy · #COSMIC cancer database #Constant (computer programming) #Cosmology #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Gaussian #Gaussian network model #Gaussian process #Hubble's law #Planck #Range (aeronautics) #Redshift #Statistical Mechanics and Entropy #astro-ph.CO #astro-ph.GA #gr-qc #hep-ph
paper · pdf · doi:10.1088/1475-7516/2018/02/034
published in Journal of Cosmology and Astroparticle Physics 2018(02), 034 (Institute of Physics) · 20 pages, 24 figures, 3 tables. Matches final published version in JCAP
arxiv created 2018/02/15 · openalex publication_date 2018/02/19 · openalex created_date 2018/02/23 · arxiv updated 2018/09/21 · openalex updated_date 2026/08/05
The use of Gaussian Processes with a measurement of the cosmic expansion rate based solely on the observation of cosmic chronometers provides a completely cosmology-independent reconstruction of the Hubble constant H ( z ) suitable for testing different models. The corresponding dispersion σ H is smaller than ∼ 9% over the entire redshift range (≲ z ≲ 20) of the observations, rivaling many kinds of cosmological measurements available today. We use the reconstructed H ( z ) function to test six different cosmologies, and show that it favours the R h = ct universe, which has only one free parameter (i.e., H 0 ) over other models, including Planck ΛCDM . The parameters of the standard model may be re-optimized to improve the fits to the reconstructed H ( z ) function, but the results have smaller p -values than one finds with R h = ct .