Comparison of Supernovae Datasets Constraints on Dark Energy

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2007,（5）
• 页码范围: 1425-1428
• 页数: 4页
• 语种: 英文

摘要

Cosmological measurements suggest that our universe contains a dark energy component. In order to study the dark energy evolution, we constrain a parameterized dark energy equation of state ω(z) = ω0+ω1(z/1+z) using the recent observational datasets: 157 Gold type la supernovae and the newly released 182 Gold type la supernovae by the maximum likelihood method. It is found that the best fit ω(z) crosses -1 in the past and the present best fit value of ω(0)＜-1 obtained from 157 Gold-type la supernovae. The crossing of -1 is not realized and ω0=-1 is not ruled out in 1σ confidence level for the 182 Gold-type la supernovae. It is also found that the range of parameter ω0 is wide even in 1σ confidence level and the best fit ω(z) is sensitive to the prior of Ωm.