Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-18
Astronomy and Astrophysics
Astrophysics
7 pages, 3 figures, 4 tables. Observational Hubble data alone as a cosmic constraint is added. Some references are added. The
Scientific paper
10.1142/S0217732308025991
In this paper, three kinds of simple parameterized deceleration parameters $q(z)=a+\frac{b z}{1+z}$, $q(z)=a+\frac{b z}{(1+z)^2}$ and $q(z)={1/2}+\frac{a z+b}{(1+z)^2}$ are reconstructed from the latest Sne Ia Gold dataset, observational Hubble data and their combination. It is found that the transition redshift from decelerated expansion to accelerated expansion $z_T$ and current decelerated parameter values $q_0$ are consistent with each other in $1\sigma$ region by only using Sne Ia Gold dataset and observational Hubble data in three parameterizations respectively. By combining the Sne Ia Gold dataset and observational Hubble data together, a tight constraint is obtained. With this combined constraints, $z_T$ is $0.505^{+0.080}_{-0.052}$, $0.368^{+0.059}_{-0.036}$, $0.767^{+0.121}_{-0.126}$ with $1\sigma$ error in three parameterizations respectively. And, it is easy to see that $z_T$ separates from each other in $1\sigma$ region clearly.
Chang Baorong
Liu Hongya
Xu Lixin
Zhang Chengwu
No associations
LandOfFree
Reconstruction of Deceleration Parameters from Recent Cosmic Observations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Reconstruction of Deceleration Parameters from Recent Cosmic Observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reconstruction of Deceleration Parameters from Recent Cosmic Observations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-260284