A quantitative criteria for the coincidence problem

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 interacti...

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Bibliographic Details
Published in:Physics letters. B 2009-07, Vol.678 (4), p.331-334
Main Authors: Zhang, Hongsheng, Yu, Heng, Zhu, Zong-Hong, Gong, Yungui
Format: Article
Language:English
Subjects:
Chaplygin gas
Dark energy
Exact sciences and technology
Nuclear physics
Physics
The physics of elementary particles and fields
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Summary: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.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2009.05.062