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arXiv 1204.5571astro-ph.CO
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修正的Chaubergin气体作为统一的暗物质和暗能量模型及宇宙约束

Modified Chaplygin Gas as a Unified Dark Matter and Dark Energy Model and Cosmic Constraints

Lixin Xu, Yuting Wang, Hyerim Noh

摘要:

利用现有的宇宙观测数据,包括Ia型超新星、重子声学振荡和WMAP第七年全谱数据,对修正的Chaobergin气体模型(MCG)$ρ_{MCG}/ρ_{MCG0}=[B_{s}+(1-B_{s})a^{-3(1+B)(1+α)}]^{1/(1+α)}$进行了约束,将其作为统一的暗物质模型和暗能量模型.与文献中的考虑不同,我们没有把MCG分成暗物质和暗能量两个分量,而是把它看作一个整体的能量分量--一个统一的暗扇区。利用马尔可夫链蒙特卡罗方法,得到了一个紧约束:$α= 0.000727_{- 0.00140- 0.00234}^{+ 0.00142+ 0.00391}$,$B=0.000777_{- 0.000302- 0.000697}^{+ 0.000201+ 0.000915}$和$B_s= 0.782_{- 0.0162- 0.0329}^{+ 0.0163+ 0.0307}$。

英文摘要:

A modified Chaplygin gas model (MCG), $ρ_{MCG}/ρ_{MCG0}=[B_{s}+(1-B_{s})a^{-3(1+B)(1+α)}]^{1/(1+α)}$, as a unified dark matter model and dark energy model is constrained by using current available cosmic observational data points which include type Ia supernovae, baryon acoustic oscillation and the seventh year full WMAP data points. As a contrast to the consideration in the literatures, we {\it do not} separate the MCG into two components, i.e. dark mater and dark energy component, but we take it as a whole energy component-a unified dark sector. By using Markov Chain Monte Carlo method, a tight constraint is obtained: $α= 0.000727_{- 0.00140- 0.00234}^{+ 0.00142+ 0.00391}$, $B=0.000777_{- 0.000302- 0.000697}^{+ 0.000201+ 0.000915}$ and $B_s= 0.782_{- 0.0162- 0.0329}^{+ 0.0163+ 0.0307}$ .}

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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