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arXiv 1004.2599astro-ph.CO
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径向重子声学振荡测量和哈勃观测数据的宇宙学约束

Cosmological constraints from Radial Baryon Acoustic Oscillation measurements and Observational Hubble data

Zhong-Xu Zhai, Hao-Yi Wan, Tong-Jie Zhang

摘要:

利用径向重子声学振荡(RBAO)测量、远距离Ia型超新星(SNe Ia)、观测$H(z)$数据(OHD)和宇宙微波背景(CMB)位移参数数据,对$Λ$ CDM和XCDM宇宙学参数进行了约束,并进一步研究了OHD和SNe Ia数据在宇宙学约束中的作用.通过对概率密度$P\propto e^{-χ^{2}/2}$的积分,对$h$上的似然函数进行边缘化处理,得到了最佳拟合结果和$Ω_{m}-Ω_Λ$平面上的置信域,并对{ \rm $Λ$ }CDM和XCDM模型进行了组合分析,得到了68.3%的置信域,OHD+RBAO+CMB与SNe Ia+RBAO + CMB的一致性分别为95.4%和99.7%,与Lin等的结果一致。随着OHD观测数据的增加,我们有可能用OHD观测数据代替Ia型超新星观测数据来约束宇宙学参数。

英文摘要:

We use the Radial Baryon Acoustic Oscillation (RBAO) measurements, distant type Ia supernovae (SNe Ia), the observational $H(z)$ data (OHD) and the Cosmic Microwave Background (CMB) shift parameter data to constrain cosmological parameters of $Λ$CDM and XCDM cosmologies and further examine the role of OHD and SNe Ia data in cosmological constraints. We marginalize the likelihood function over $h$ by integrating the probability density $P\propto e^{-χ^{2}/2}$ to obtain the best fitting results and the confidence regions in the $Ω_{m}-Ω_Λ$ plane.With the combination analysis for both of the {\rm $Λ$}CDM and XCDM models, we find that the confidence regions of 68.3%, 95.4% and 99.7% levels using OHD+RBAO+CMB data are in good agreement with that of SNe Ia+RBAO+CMB data which is consistent with the result of Lin et al's work. With more data of OHD, we can probably constrain the cosmological parameters using OHD data instead of SNe Ia data in the future.

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