Density perturbations in a universe dominated by the Chaplygin gas

被引：259

作者：

Fabris, JC ^{[1
]}

Gonçalves, SVB ^{[1
]}

de Souza, PE ^{[1
]}

机构：

[1] Univ Fed Espirito Santo, Dept Fis, BR-29060900 Vitoria, ES, Brazil

来源：

GENERAL RELATIVITY AND GRAVITATION | 2002年 / 34卷 / 01期

关键词：

universe model; negative pressure;

D O I：

10.1023/A:1015266421750

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the fate of density perturbations in a Universe dominate by the Chaplygin gas, which exhibit negative pressure, In apposition to other models of perfect fluid with negative pressure, there is no instability in the small wavelength limit, due to the fact that the sound velocity for the Chaplygin gas is positive. We show that it is possible to obtain the value for the density contrast observed in large scale structure of the Universe by fixing a free parameter in the equation of state of this gas. The negative character of pressure must be significant only very recently.

引用

页码：53 / 63

页数：11

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