Model selection using cosmic chronometers with Gaussian Processes

Fulvio Melia, Manoj K. Yennapureddy

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

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 σH 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 Rh=ct universe, which has only one free parameter (i.e., H0) 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 Rh=ct.

Original languageEnglish (US)
Article number034
JournalJournal of Cosmology and Astroparticle Physics
Volume2018
Issue number2
DOIs
StatePublished - Feb 19 2018

Keywords

  • cosmic ows
  • cosmology of theories beyond the SM
  • galaxy evolution
  • star formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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