Open AccessSupernova constraints on alternative models to dark energy
Author(s) -
Gong Yungui,
Duan ChangKui
Publication year - 2004
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2004.07976.x
Subject(s) - physics , supernova , dark energy , friedmann equations , acceleration , redshift , cosmology , astrophysics , universe , metric expansion of space , deceleration parameter , scale factor (cosmology) , classical mechanics , galaxy
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 H 2 ∼ρ is modified to be a general form H 2 = 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 z T when the Universe switched from the deceleration phase to the acceleration phase.