Parameterizing the effect of dark energy perturbations on the growth of structures

被引：58

作者：

Ballesteros, Guillermo ^{[1
,3
]}

Riotto, Antonio ^{[2
,3
]}

机构：

[1] Univ Autonoma Madrid, Inst Fis Teor, CSIC, E-28049 Madrid, Spain

[2] Sez Padova, Ist Nazl Fis Nucl, I-35131 Padua, Italy

[3] CERN, Div Theory, CH-1211 Geneva 23, Switzerland

来源：

PHYSICS LETTERS B | 2008年 / 668卷 / 03期

关键词：

D O I：

10.1016/j.physletb.2008.08.035

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an analytical fit to the growth function of the dark matter perturbations when-dark energy perturbations are present. The growth index gamma depends upon the dark energy equation of state w, the speed of sound of the dark energy fluctuations, the dark matter abundance and the observed comoving scale. The growth index changes by O(5%) for small speed of sound and large deviations of w from -1 with respect to its value in the limit of no dark energy perturbations. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：171 / 176

页数：6

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