Large-scale Structure in f(T) Gravity

Understand

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.