Cluster formation rate in models with dark energy

被引：42

作者：

Basilakos, S ^{[1
]}

机构：

[1] Natl Observ Athens, Inst Astron & Astrophys, Athens 15236, Greece

来源：

ASTROPHYSICAL JOURNAL | 2003年 / 590卷 / 02期

关键词：

cosmology : theory; large-scale structure of universe;

D O I：

10.1086/375154

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Based on flat Friedmann-Robertson-Walker cold dark matter (CDM) models driven by nonrelativistic matter and an exotic fluid (quintessence) with an equation of state p(Q) = wrho(Q) (-1 less than or equal to w < 0), we investigate whether or not the large-scale dynamical effects of cluster formation and virialization are related to the cosmic equation of state. Using nonlinear spherical collapse we find that the cluster formation rate in quintessence models is intermediate between open and ΛCDM. For the QCDM case, using the virial theorem and energy conservation and assuming a spherical mass overdensity shell, we obtain analytically the ratio between the final (virial) and the turnaround radii. We find that the above ratio is almost independent of the equation of state.

引用

页码：636 / 640

页数：5

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