Large-scale Structure in f(T) Gravity

Details Large-scale Structure in f(T) Gravity Large-scale Structure in f(T) Gravity

2011-03-14

arxiv.org/abs/1103.2786v1

Phys.Rev.D83:104017,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

13 pages, 3 figures

Scientific paper

10.1103/PhysRevD.83.104017

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 LCDM scenario, leading to severe constraints on the f(T) gravity models as an explanation to the cosmic acceleration.

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