Statefinder hierarchy: An extended null diagnostic for concordance cosmology

被引:75
作者
Arabsalmani, Maryam [1 ]
Sahni, Varun [1 ]
机构
[1] Inter Univ Ctr Astron & Astrophys, Pune 411007, Maharashtra, India
来源
PHYSICAL REVIEW D | 2011年 / 83卷 / 04期
关键词
DARK ENERGY; CONSTANT;
D O I
10.1103/PhysRevD.83.043501
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We show how higher derivatives of the expansion factor can be developed into a null diagnostic for concordance cosmology (Lambda CDM). It is well known that the Statefinder-the third derivative of the expansion factor written in dimensionless form, a((3))/aH(3), equals unity for Lambda CDM. We generalize this result and demonstrate that the hierarchy, a((n))/aH(n), can be converted to a form that stays pegged at unity in concordance cosmology. This remarkable property of the Statefinder hierarchy enables it to be used as an extended null diagnostic for the cosmological constant. The Statefinder hierarchy combined with the growth rate of matter perturbations defines a composite null diagnostic which can distinguish evolving dark energy from Lambda CDM.
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页数:5
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