Aspects of the cosmological "coincidence problem"

被引：201

作者：

Velten, H. E. S. ^{[1
]}

vom Marttens, R. F. ^{[1
]}

Zimdahl, W. ^{[1
]}

机构：

[1] Univ Fed Espirito Santo UFES, Dept Fis, BR-29075910 Vitoria, ES, Brazil

来源：

EUROPEAN PHYSICAL JOURNAL C | 2014年 / 74卷 / 11期

关键词：

COSMIC COINCIDENCE;

D O I：

10.1140/epjc/s10052-014-3160-4

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The observational fact that the present values of the densities of dark energy and dark matter are of the same order of magnitude, rho de0/rho dm0 similar to O(1), seems to indicate that we are currently living in a very special period of the cosmic history. Within the standard model, a density ratio of the order of one just at the present epoch can be seen as coincidental since it requires very special initial conditions in the early Universe. The corresponding "why now" question constitutes the cosmological "coincidence problem". According to the standard model the equality rho(de) = rho(dm) took place "recently" at a redshift z approximate to 0.55. The meaning of "recently" is, however, parameter dependent. In terms of the cosmic time the situation looks different. We discuss several aspects of the "coincidence problem", also in its relation to the cosmological constant problem, to issues of structure formation and to cosmic age considerations.

引用

页数：8

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