期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 352, 期 3, 页码 847-851出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2004.07976.x
关键词
supernovae : general; cosmological parameters; cosmology : theory; distance scale; radio lines : galaxies
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 similar to rho is modified to be a general form H-2 = g(rho). Three models with particular form of g(rho) 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.
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