Dark energy, curvature, and cosmic coincidence
arXiv:astro-ph/0509177 · doi:10.1016/j.physletb.2006.08.070
Abstract
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.
arXiv comment14 pages, 2 figures. Revised, references added, accepted for publication in Physics Letters B. Final version matches published version
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