Testing the Rh=ct universe jointly with the redshift-dependent expansion rate and angular-diameter and luminosity distances

Hao Yi Wan, Shu Lei Cao, Fulvio Melia, Tong Jie Zhang

Research output: Contribution to journalArticle

Abstract

We use three different data sets, specifically H(z) measurements from cosmic chronometers, the HII-galaxy Hubble diagram, and reconstructed quasar-core angular-size measurements, to perform a joint analysis of three flat cosmological models: the Rh=ct Universe, ΛCDM, and wCDM. For Rh=ct, the 1σ best-fit value of the Hubble constant H0 is 62.336±1.464km s−1Mpc−1, which matches previous measurements (∼63km s−1Mpc−1) based on best fits to individual data sets. For ΛCDM, our inferred value of the Hubble constant, H0=67.013±2.578km s−1Mpc−1, is more consistent with the Planck optimization than the locally measured value using Cepheid variables, and the matter density Ωm=0.347±0.049 similarly coincides with its Planck value to within 1σ. For wCDM, the optimized parameters are H0=64.718±3.088km s−1Mpc−1, Ωm=0.247±0.108 and w=−0.693±0.276, also consistent with Planck. A direct comparison of these three models using the Bayesian Information Criterion shows that the Rh=ct universe is favored by the joint analysis with a likelihood of ∼97% versus ≲3% for the other two cosmologies.

Original languageEnglish (US)
Article number100405
JournalPhysics of the Dark Universe
Volume26
DOIs
StatePublished - Dec 2019

Keywords

  • Cosmological observations
  • Cosmological parameters
  • Cosmological theory
  • Dark energy
  • Galaxies
  • Large-scale structure

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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