Dark energy, curvature, and cosmic coincidence

Details Dark energy, curvature, and cosmic coincidence Dark energy, curvature, and cosmic coincidence

2005-09-07

arxiv.org/abs/astro-ph/0509177v4

Phys.Lett.B641:351-356,2006

Astronomy and Astrophysics

Astrophysics

14 pages, 2 figures. Revised, references added, accepted for publication in Physics Letters B. Final version matches published

Scientific paper

10.1016/j.physletb.2006.08.070

The fact that the energy densities of dark energy and matter are similar currently, known as the coincidence problem, is one of the main unsolved problems of cosmology. We present here a model in which a spatial curvature of the universe can lead to a transition in the present epoch from a matter dominated universe to a scaling dark energy dominance in a very natural way. In particular, we show that if the exponential potential of the dark energy field depends linearly on the spatial curvature density of a closed universe, the observed values of some cosmological parameters can be obtained assuming acceptable values for the present spatial curvature of the universe, and without fine tuning in the only parameter of the model. We also comment on possible variations of this model, and realistic scenarios in which it could arise.

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