Revisiting generalized Chaplygin gas as a unified dark matter and dark energy model
Revisiting generalized Chaplygin gas as a unified dark matter and dark energy model
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DOI：
10.1140/epjc/s10052-012-1883-7
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发表时间：
2012-02
期刊：
影响因子：
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通讯作者：
Lixin Xu;Jianbo Lu;Yuting Wang
中科院分区：
文献类型：
--
作者：
Lixin Xu;Jianbo Lu;Yuting Wang
在本文中，我们重新审视广义Chaubergin气体（GCG）模型作为一个统一的暗物质和暗能量模型。GCG模型的能量密度为ρGCG/ρ GCG 0 =[Bs+（1−Bs）a−3（1+α）]1/（1+α），其中α和Bs是两个模型参数，将以Ia型超新星为标准烛光，以重子声振荡为标准标尺，以WMAP第7年全数据点作为约束条件。在本文中，我们将不再像文献中那样把GCG分成暗物质和暗能量两部分。利用马尔可夫链蒙特卡罗方法，我们得到了结果和。
In this paper, we revisit the generalized Chaplygin gas (GCG) model as a unified dark matter and dark energy model. The energy density of GCG model is given asρGCG/ρGCG0=[Bs+(1−Bs)a−3(1+α)]1/(1+α), whereαandBsare two model parameters which will be constrained by type Ia supernova as standard candles, baryon acoustic oscillation as standard rulers and the seventh year full WMAP data points. In this paper, we will not separate GCG into dark matter and dark energy parts any more as adopted in the literature. By using the Markov Chain Monte Carlo method, we find the resultsand.