Dark Energy versus Modified Gravity

Details Dark Energy versus Modified Gravity Dark Energy versus Modified Gravity

2006-12-17

arxiv.org/abs/astro-ph/0612452v1

Phys.Rev.Lett.98:121301,2007

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.98.121301

There is now strong observational evidence that the expansion of the universe is accelerating. The standard explanation invokes an unknown "dark energy" component. But such scenarios are faced with serious theoretical problems, which has led to increased interest in models where instead General Relativity is modified in a way that leads to the observed accelerated expansion. The question then arises whether the two scenarios can be distinguished. Here we show that this may not be so easy, demonstrating explicitely that a generalised dark energy model can match the growth rate of the DGP model and reproduce the 3+1 dimensional metric perturbations. Cosmological observations are then unable to distinguish the two cases.

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