Testing the phenomenological interacting dark energy with observational H(z) data
Testing the phenomenological interacting dark energy with observational H(z) data
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DOI：
10.1111/j.1365-2966.2011.19105.x
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发表时间：
2010-12
影响因子：
4.8
通讯作者：
Shuo Cao;N. Liang;Zong-hong Zhu
中科院分区：
文献类型：
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作者：
Shuo Cao;N. Liang;Zong-hong Zhu
为了检验暗能量和暗物质之间可能的相互作用，我们研究了一个唯象场景的观测约束，其中暗能量和物质密度之间的比率与标度因子r <$（ρX/ρm）<$a <$的幂律情况成比例。利用马尔可夫链蒙特卡罗方法，用新修正的H（z）数据和威尔金森微波各向异性探测器（WMAP 7）7年观测的宇宙微波背景（CMB）数据，对唯象相互作用暗能量模型进行约束，从光谱斯隆数字巡天（SDSS）数据发布7（DR 7）中观测到的重子声振荡（BAO）银河系样本和Ia型超新星（SNe Ia）从联盟2集。模型参数的最佳拟合值为Ωm0= 0.27+0.02−0.02（1σ）+0.04 <$0.03（2σ），ω = 3.15+0.48−0.50（1σ）+0.72 <$0.71（2σ）和wX=−1.05+0.15−0.14（1σ）+0.21 <$0.21（2σ），比以前的结果更严格。这些结果表明，没有相互作用的标准Λ冷暗物质（ΛCDM）模型仍然与最近的观测数据有很好的拟合，但暗物质向暗能量传递的相互作用略优于暗能量向暗物质的相互作用. H（z）数据与CMB和BAO观测数据相结合时，对唯象相互作用方案有更严格的约束，H（z）+BAO+CMB、SNe+BAO+CMB和H（z）+SNe+BAO+CMB组合的置信域是一致的。
In order to test the possible interaction between dark energy and dark matter, we investigate observational constraints on a phenomenological scenario, in which the ratio between the dark energy and matter densities is proportional to the power-law case of the scalefactor, r≡ (ρX/ρm) ∝aξ. By using the Markov chain Monte Carlo method, we constrain the phenomenological interacting dark energy model with the newly revised H(z) data, as well as the cosmic microwave background (CMB) observation from the 7-year Wilkinson Microwave Anisotropy Probe (WMAP7) results, the baryonic acoustic oscillation (BAO) observation from the spectroscopic Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) galaxy sample and the Type Ia supernovae (SNe Ia) from the Union2 set. The best-fitting values of the model parameters are Ωm0= 0.27+0.02−0.02 (1σ)+0.04−0.03 (2σ), ξ= 3.15+0.48−0.50(1σ)+0.72−0.71(2σ) and wX=−1.05+0.15−0.14(1σ)+0.21−0.21(2σ), which are more stringent than previous results. These results show that the standard Λ cold dark matter (ΛCDM) model without any interaction remains a good fit to the recent observational data; however, the interaction that the energy transferring from dark matter to dark energy is slightly favoured over the interaction from dark energy to dark matter. It is also shown that the H(z) data can give more stringent constraints on the phenomenological interacting scenario when combined with CMB and BAO observations, and the confidence regions of H(z)+BAO+CMB, SNe+BAO+CMB and H(z)+SNe+BAO+CMB combinations are consistent with each other.