Probing dark energy dynamics from current and future cosmological observations
Probing dark energy dynamics from current and future cosmological observations
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DOI：
10.1103/physrevd.81.043518
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发表时间：
2009-08
影响因子：
5
通讯作者：
Gong-Bo Zhao;Xinmin Zhang
中科院分区：
文献类型：
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作者：
Gong-Bo Zhao;Xinmin Zhang
我们使用最新的“宪法”SNe样本结合WMAP 5和斯隆数字巡天数据报告了暗能量状态方程w（z）的约束。假设宇宙是平坦的，利用定域主成分分析和模型选择准则，我们发现ΛCDM模型与当前的数据基本一致，但暗能量的可能动力学存在一个微弱的暗示。特别是，预测w（z）在z∈[0.5，0.75）时为-1的模型，这意味着w（z）在z∈[0.25，0.75）的范围内与-1交叉，在95%的置信水平下略微有利。以当前数据的最佳拟合模型作为基准模型，我们利用联合暗能量使命、普朗克和大型综合巡天望远镜的联合数据集对未来进行预测，发现未来的巡天可以将w面元上的误差条减少约10倍
We report the constraints on the dark energy equation-of-state w(z) using the latest “Constitution” SNe sample combined with the WMAP5 and Sloan Digital Sky Survey data. Assuming a flat Universe, and utilizing the localized principal component analysis and the model selection criteria, we find that the ΛCDM model is generally consistent with the current data, yet there exists a weak hint of the possible dynamics of dark energy. In particular, a model predicting w(z)-1 at z∈[0.5,0.75), which means that w(z) crosses -1 in the range of z∈[0.25,0.75), is mildly favored at 95% confidence level. Given the best fit model for current data as a fiducial model, we make future forecast from the joint data sets of Joint Dark Energy Mission, Planck, and Large Synoptic Survey Telescope, and we find that the future surveys can reduce the error bars on the w bins by roughly a factor of 10 for a 5-w-bin model