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arXiv 0810.4308astro-phgr-qchep-th
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广义Chaubergin气体模型的物质功率谱：牛顿方法

Matter Power Spectrum for the Generalized Chaplygin Gas Model: The Newtonian Approach

J. C. Fabris, S. V. B. Goncalves, H. E. S. Velten, W. Zimdahl

备注：
Latex file, 17 pages, 29 figures in eps format
发表信息：
Phys.Rev.D78:103523,2008
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摘要：

我们将宇宙介质建模为广义Chaubergin气体和无压物质组分的混合物。在一个新牛顿的方法（其中，不同于标准的牛顿宇宙学，压力进入均匀和各向同性的背景动力学），我们计算的物质功率谱。2dFGRS的数据被用来区分统一模型的暗扇区（一个纯粹的重子物质的组成部分，约占总能量的5%和约95%的广义Chaubergin气体）和不同的模型，其中有单独的暗物质，除了由广义Chaubergin气体占。如果不考虑相应的密度参数，我们发现统一模型是非常不利的。另一方面，使用统一的模型先验，观测数据也得到了很好的描述，特别是对于小的和大的值的广义Chaubergin气体参数$α$。后者的结果是在最近的协议，更定性，但完全相对论，在Gorini等人的微扰分析。

英文摘要：

We model the cosmic medium as the mixture of a generalized Chaplygin gas and a pressureless matter component. Within a neo-Newtonian approach (in which, different from standard Newtonian cosmology, the pressure enters the homogeneous and isotropic background dynamics) we compute the matter power spectrum. The 2dFGRS data are used to discriminate between unified models of the dark sector (a purely baryonic matter component of roughly 5 percent of the total energy content and roughly 95 percent generalized Chaplygin gas) and different models, for which there is separate dark matter, in addition to that accounted for by the generalized Chaplygin gas. Leaving the corresponding density parameters free, we find that the unified models are strongly disfavored. On the other hand, using unified model priors, the observational data are also well described, in particular for small and large values of the generalized Chaplygin gas parameter $α$. The latter result is in agreement with a recent, more qualitative but fully relativistic, perturbation analysis in Gorini et al.

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