2021/06/29 by Salvatore Capozziello, Salvatore Capozzıello, Peter K. S. Dunsby +1 · 63 citations
Physics and Astronomy · #Astrophysics #Baryon #Baryon acoustic oscillations #COSMIC cancer database #Cosmology #Cosmology and Gravitation Theories #Dark energy #Dark matter #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gamma-ray bursts and supernovae #Hubble's law #Observable #Physics #Quantum mechanics #Redshift #Solar and Space Plasma Dynamics #Supernova #astro-ph.CO #gr-qc
paper · pdf · doi:10.1093/mnras/stab3187
published in arXiv (Cornell University) 509(4), 5399-5415 (Cornell University) · 17 pages, 11 figures, 3 tables, Accepted for publication in MNRAS
openalex publication_date 2021/06/29 · arxiv created 2021/10/31 · arxiv updated 2021/11/17 · openalex created_date 2021/11/22 · openalex updated_date 2026/08/05
We propose two model independent methods to obtain constraints on the transition and equivalence redshifts ztr, zeq. In particular, we consider ztr as the onset of cosmic acceleration, whereas zeq the redshift at which the densities of dark energy and pressureless matter are equated. With this prescription, we expand the Hubble and deceleration parameters up to two hierarchical orders and show a linear correlation between transition and equivalence, from which we propose exclusion plots where zeq is not allowed to span. To this end, we discuss how to build up cosmographic expansions in terms of ztr and compute the corresponding observable quantities directly fitting the luminosity and angular distances and the Hubble rate with cosmic data. We make our computations through Monte Carlo fits involving type Ia supernova, baryonic acoustic oscillation and Hubble most recent data catalogs. We show at 1σ confidence level the ΛCDM predictions on ztr and zeq are slightly confirmed, although at 2σ confidence level dark energy expectations cannot be excluded. Finally, we theoretically interpret our outcomes and discuss possible limitations of our overall approach.