Growth of matter perturbations in clustered holographic dark energy cosmologies

被引：35
作者：
Mehrabi, Ahmad [1 ]
Basilakos, Spyros [2 ]
Malekjani, Mohammad [1 ]
Davari, Zahra [1 ]
机构：
[1] Bu Ali Sina Univ, Dept Phys, Hamadan 65178016016, Iran
[2] Acad Athens, Res Ctr Astron & Appl Math, Athens 11527, Greece
来源：
PHYSICAL REVIEW D | 2015年 / 92卷 / 12期
关键词：
BARYON ACOUSTIC-OSCILLATIONS; COSMIC STRUCTURE; BLACK-HOLES; CONSTRAINTS; MODEL; CONSTANT; GALAXIES; LAMBDA; INDEX; EXPANSION;
D O I：
10.1103/PhysRevD.92.123513
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We investigate the growth of matter fluctuations in holographic dark energy cosmologies. First, we use an overall statistical analysis involving the latest observational data in order to place constraints on the cosmological parameters. Then we test the range of validity of the holographic dark energy models at the perturbation level and its variants from the concordance Lambda cosmology. Specifically, we provide a new analytical approach in order to derive, for the first time, the growth index of matter perturbations. Considering a homogeneous holographic dark energy, we find that the growth index is gamma approximate to 4/7 which is somewhat larger (similar to 4.8%) than that of the usual Lambda cosmology, gamma((Lambda)) approximate to 6/11. Finally, if we allow clustering in the holographic dark energy models, then the asymptotic value of the growth index is given in terms of the effective sound speed c(eff)(2), namely, gamma approximate to 3(1-c(eff)(2))/7.
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页数：11
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