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Reconstruction of Deceleration Parameters from Recent Cosmic Observations | | Lixin Xu
; Chengwu Zhang
; Baorong Chang
; Hongya Liu
; | | Date: |
18 Jan 2007 | | Abstract: | In this paper, three kinds of simple parameterized deceleration parameters are reconstructed from the latest released observations of Sne Ia and Hubble data. It is found out that the transition redshift from decelerated expansion to accelerated expansion is about $z_Tsim 0.36-0.39$ in these three kinds of parameterizations by only using Gold Sne Ia datasets. By adding the Hubble parameter data, the $z_T$ becomes in the range of $0.37-0.77$ and the errors become bigger than that in the cases of only Sne Ia datasets cases. It is also pointed out that the differences of the best fit values of transition time from decelerated expansion to accelerated expansion are due to the concrete parameterized forms. But, in $1sigma$ range, they are consistent with each other. At last, in this way some equation of state of dark energy and some dark energy models will be rule out, but this much rely on the errors at the transition redshift. | | Source: | arXiv, astro-ph/0701519 | | Services: | Forum | Review | PDF | Favorites | |
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