Testing the Rh = ct universe jointly with the redshift-dependent expansion rate and angular-diameter and luminosity distances
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 1 σ best-fit value of the Hubble constant H0 is 62 . 336 ± 1 . 464 km s-1Mpc-1 , which matches previous measurements (∼ 63 km s-1Mpc-1) based on best fits to individual data sets. For ΛCDM, our inferred value of the Hubble constant, H0 = 67 . 013 ± 2 . 578 km 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 1 σ. For wCDM, the optimized parameters are H0 = 64 . 718 ± 3 . 088 km 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.
- Publication:
-
Physics of the Dark Universe
- Pub Date:
- December 2019
- DOI:
- 10.1016/j.dark.2019.100405
- arXiv:
- arXiv:1910.14024
- Bibcode:
- 2019PDU....2600405W
- Keywords:
-
- Cosmological parameters;
- Cosmological observations;
- Cosmological theory;
- Dark energy;
- Galaxies;
- Large-scale structure;
- Astrophysics - Cosmology and Nongalactic Astrophysics;
- General Relativity and Quantum Cosmology
- E-Print:
- 20 pages, 4 figures, Physics of the Dark Universe, in press