A quantitative criteria for the coincidence problem

Details A quantitative criteria for the coincidence problem A quantitative criteria for the coincidence problem

2009-06-07

arxiv.org/abs/0906.1357v1

Phys.Lett.B678:331-334,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 3 figures, accepted for publication in Phys.Lett.B

Scientific paper

10.1016/j.physletb.2009.05.062

The cosmic coincidence problem is a serious challenge to dark energy model. We suggest a quantitative criteria for judging the severity of the coincidence problem. Applying this criteria to three different interacting models, including the interacting quintessence, interacting phantom, and interacting Chaplygin gas models, we find that the interacting Chaplygin gas model has a better chance to solve the coincidence problem. Quantitatively, we find that the coincidence index C for the interacting Chaplygin gas model is smaller than that for the interacting quintessence and phantom models by six orders of magnitude.

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