Supernova constraints on alternative models to dark energy

2004/01/31 by Yungui Gong, Chang-Kui Duan, Chang‐Kui Duan
Physics and Astronomy · #Acceleration #Astrophysics #Classical mechanics #Cosmology #Cosmology and Gravitation Theories #Dark energy #Deceleration parameter #Friedmann equations #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gamma-ray bursts and supernovae #Metric expansion of space #Physics #Redshift #Scale factor (cosmology) #Supernova #Universe #astro-ph #gr-qc #hep-ph

paper · pdf · doi:10.1111/j.1365-2966.2004.07976.x

published as Mon.Not.Roy.Astron.Soc. 352 (2004) 847 · 5 pages, 4 figures, use mn2e class, accepted for publication by MNRAS

arxiv created 2004/05/04 · openalex publication_date 2004/07/30 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

The recent observations of Type Ia supernovae suggest that the Universe is accelerating now and decelerated in the recent past. This may be the evidence of the breakdown of the standard Friedmann equation. The Friedmann equation H2∼ρ is modified to be a general form H2=g(ρ). Three models with particular form of g(ρ) are considered in detail. The supernova data published by Tonry et al., Daly & Djorgovski and Knop et al. are used to analyse the models. After the best-fitting parameters are obtained, we then find out the transition redshift zT when the Universe switched from the deceleration phase to the acceleration phase.

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