Large-scale structure in f(T) gravity

被引:202
|
作者
Li, Baojiu [1 ,2 ]
Sotiriou, Thomas P. [1 ]
Barrow, John D. [1 ]
机构
[1] Univ Cambridge, Ctr Math Sci, DAMTP, Cambridge CB3 0WA, England
[2] Kavli Inst Cosmol Cambridge, Cambridge CB3 0HA, England
来源
PHYSICAL REVIEW D | 2011年 / 83卷 / 10期
基金
英国科学技术设施理事会;
关键词
D O I
10.1103/PhysRevD.83.104017
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In this work we study the cosmology of the general f(T) gravity theory. We express the modified Einstein equations using covariant quantities, and derive the gauge-invariant perturbation equations in covariant form. We consider a specific choice of f(T), designed to explain the observed late-time accelerating cosmic expansion without including an exotic dark energy component. Our numerical solution shows that the extra degree of freedom of such f(T) gravity models generally decays as one goes to smaller scales, and consequently its effects on scales such as galaxies and galaxies clusters are small. But on large scales, this degree of freedom can produce large deviations from the standard Lambda CDM scenario, leading to severe constraints on the f(T) gravity models as an explanation to the cosmic acceleration.
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页数:13
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