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arXiv 0910.4202astro-ph.COgr-qchep-th
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基于广义Chaubergin气体的统一暗物质和暗能量模型的观测约束

Observational constraints on a unified dark matter and dark energy model based on generalized Chaplygin gas

Chan-Gyung Park, Jai-chan Hwang, Jaehong Park, Hyerim Noh

摘要:

本文研究了一种广义的Chaubergin气体作为暗物质和暗能量的统一模型。利用现实的理论模型和现有的观测数据,从宇宙的年龄,膨胀历史的基础上Ia型超新星,物质功率谱,宇宙微波背景辐射各向异性功率谱,和扰动增长因子,我们把统一模型进行观测检验。由于该模型只有两个自由参数在平坦的弗里德曼背景[ $Λ$ CDM(冷暗物质)模型只有一个自由参数],我们表明,该模型已经被严格约束目前可用的观测。唯一的参数空间非常接近的$Λ$ CDM模型是允许在这个统一的模型。

英文摘要:

We study a generalized version of Chaplygin gas as unified model of dark matter and dark energy. Using realistic theoretical models and the currently available observational data from the age of the universe, the expansion history based on the type Ia supernovae, the matter power spectrum, the cosmic microwave background radiation anisotropy power spectra, and the perturbation growth factor we put the unified model under observational test. As the model has only two free parameters in the flat Friedmann background [$Λ$CDM (cold dark matter) model has only one free parameter] we show that the model is already tightly constrained by currently available observations. The only parameter space extremely close to the $Λ$CDM model is allowed in this unified model.

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