2018/03/01 by Xiaogang Zheng, Marek Biesiada, Xuheng Ding +3
Physics and Astronomy · #Astronomy and Astrophysical Research #Cosmology #Cosmology and Gravitation Theories #Dark energy #Galaxies: Formation, Evolution, Phenomena #Hubble's law #Observational cosmology #Quintessence #Statistical analysis #Statistical hypothesis testing #Statistical model #astro-ph.CO
paper · pdf · doi:10.1140/epjc/s10052-018-5759-3
published as Eur.Phys.J.C. (2018)78:274 · 8 pages, 4 figures, 3 tables
openalex publication_date 2018/03/01 · arxiv created 2018/03/24 · openalex created_date 2018/04/06 · arxiv updated 2018/08/24 · openalex updated_date 2026/08/05
Direct measurements of Hubble parameters H(z) are very useful for cosmological model parameters inference. Based on them, Sahni, Shafieloo and Starobinski introduced a two-point diagnostic Omh2(zi, zj) as an interesting tool for testing the validity of the Λ \hbox CDM model. Applying this test they found a tension between observations and predictions of the Λ \hbox CDM model. We use the most comprehensive compilation H(z) data from baryon acoustic oscillations (BAO) and differential ages (DA) of passively evolving galaxies to study cosmological models using the Hubble parameters itself and to distinguish whether Λ \hbox CDM model is consistent with the observational data with statistical analysis of the corresponding Omh2(zi, zj) two-point diagnostics. Our results show that presently available H(z) data significantly improve the constraints on cosmological parameters. The corresponding statistical Omh2(zi, zj) two-point diagnostics seems to prefer the quintessence with w>-1 over the Λ \hbox CDM model. Better and more accurate prior knowledge of the Hubble constant, will considerably improve the performance of the statistical Omh2(zi, zj) method.