2017/02/27 by Balakrishna S. Haridasu, Vladimir V. Luković, Rocco D'Agostino +2 · 77 citations
Physics and Astronomy · #Acceleration #Baryon acoustic oscillations #COSMIC cancer database #Cosmology #Cosmology and Gravitation Theories #Gamma-ray bursts and supernovae #Hubble's law #Observational cosmology #Particle physics theoretical and experimental studies #Supernova #Universe #astro-ph.CO
paper · pdf · doi:10.1051/0004-6361/201730469
published in Astronomy and Astrophysics 600, L1 (EDP Sciences)
arxiv created 2017/02/27 · openalex publication_date 2017/03/08 · openalex created_date 2017/03/16 · arxiv updated 2017/03/22 · openalex updated_date 2026/08/05
A recent analysis of supernova Ia (SN Ia) data claims a “marginal” (~ 3σ) evidence for a cosmic acceleration. This result has been complemented with a non-accelerating Rh = ct cosmology, which was presented as a valid alternative to the ΛCDM model. In this paper we use the same analysis to show that non-marginal evidence for acceleration is truly found. We compare the standard Friedmann models to the Rh = ct cosmology by complementing SN Ia data with baryon acoustic oscillations, gamma ray bursts, and observational Hubble datasets. We also study the power-law model, which is a functional generalisation of Rh = ct. We find that the evidence for late-time acceleration cannot be refuted at a 4.56σ confidence level from SN Ia data alone, and at an even stronger confidence level (5.38σ) from our joint analysis. In addition, the non-accelerating Rh = ct model fails to statistically compare with the ΛCDM, having a Δ(AIC) ~ 30.