Probing cosmic acceleration by using the SNLS3 SNIa dataset
Probing cosmic acceleration by using the SNLS3 SNIa dataset
复制标题
使用 SNLS3 SNIa 数据集探测宇宙加速
DOI：
10.1088/1475-7516/2011/07/011
复制
发表时间：
2011-07-01
影响因子：
6.4
通讯作者：
Li, Miao
中科院分区：
文献类型：
--
作者：
Li, Xiao-Dong;Li, Song;Li, Miao
我们利用最近公布的472颗Ia型超新星的SNLS 3样本探测宇宙加速。将这一Ia型超新星数据集与来自威尔金森微波各向异性探测器7年观测的宇宙微波背景各向异性数据、来自斯隆数字巡天数据发布7的重子声学振荡结果以及来自哈勃太空望远镜上的宽视场相机3的哈勃常数测量相结合，我们利用Chevallier-Polarski-Linder参数化方法测量了暗能量状态方程w和减速参数q随红移的变化。我们的结果与1σ置信水平下的宇宙学常数一致，没有证据表明最近宇宙加速减慢。此外，我们考虑了三种基于不同分箱方法的分箱参数化（w在红移z中是分段常数）。得到了类似的结果，即，ΛCDM模型仍然与当前的观测结果很好地兼容。
We probe the cosmic acceleration by using the recently released SNLS3 sample of 472 type Ia supernovae. Combining this type Ia supernovae dataset with the cosmic microwave background anisotropy data from the Wilkinson Microwave Anisotropy Probe 7-yr observations, the baryon acoustic oscillation results from the Sloan Digital Sky Survey data release 7, and the Hubble constant measurement from the Wide Field Camera 3 on the Hubble Space Telescope, we measure the dark energy equation of state w and the deceleration parameter q as functions of redshift by using the Chevallier-Polarski-Linder parametrization. Our result is consistent with a cosmological constant at 1σ confidence level, without evidence for the recent slowing down of the cosmic acceleration. Furthermore, we consider three binned parametrizations (w is piecewise constant in redshift z) based on different binning methods. The similar results are obtained, i.e., the ΛCDM model is still nicely compatible with current observations.