| Comparison of Supernovae Datasets Constraints on Dark Energy |
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| 作者姓名： | 张成武 徐立昕 常葆荣 刘宏亚 |
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| 作者单位： | School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant Nos 10573003 and 10647110, the National Key Basic Research and Development Programme of China under Grant No 2003CB716300, and the DUT 893321. |
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| 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 1＋z/z using the recent observational datasets： 157 Gold type Ia supernovae and the newly released 182 Gold type Ia 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 Ia supernovae. The crossing of-1 is not realized and ω0 = -1 is not ruled out in 1σ confidence level for the 182 Gold-type Ia 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.
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| 关 键 词： | 黑暗能量 宇宙学 参数方程 进化 |
| 收稿时间： | 2007-1-13 |
| 修稿时间： | 2007-01-13 |
Comparison of Supernovae Datasets Constraints on Dark Energy |
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| ZHANG Cheng-Wu,XU Li-Xin,CHANG Bao-Rong,LIU Hong-Ya.Comparison of Supernovae Datasets Constraints on Dark Energy[J].Chinese Physics Letters,2007,24(5):1425-1428. |
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| Authors: | ZHANG Cheng-Wu XU Li-Xin CHANG Bao-Rong LIU Hong-Ya |
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| Affiliation: | School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 |
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| Abstract: | |
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| Keywords: | 98 80 Es 98 80 -k 95 36 +x |
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