Mass power spectrum in a Universe dominated by the Chaplygin gas

被引：58
|
作者：
Fabris, JC [1 ]
Gonçalves, SVB [1 ]
de Souza, PE [1 ]
机构：
[1] Univ Fed Espirito Santo, Dept Fis, BR-29060900 Vitoria, Espirito Santo, Brazil
来源：
GENERAL RELATIVITY AND GRAVITATION | 2002年 / 34卷 / 12期
关键词：
Universe model; perturbation spectrum;
D O I：
10.1023/A:1021187518781
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The mass power spectrum for a Universe dominated by the Chaplygin gas is evaluated numerically from scales of the order of the Hubble horizon to 100 Mpc. The results are compared with a pure baryonic Universe and a cosmological constant model. In all three cases, the spectrum increases with k, the wavenumber of the perturbations. The slope of the spectrum is higher for the baryonic model and smaller for the cosmological constant model, the Chaplygin gas interpolating these two models. The results are analyzed in terms of the sound velocity of the Chaplygin gas and the moment the Universe begins to accelerate.
引用
收藏
页码：2111 / 2126
页数：16
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