A quantitative criteria for the coincidence problem

Abstract

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.

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

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• Interaction between dark energy and dark matter: observational constraints from OHD, BAO, CMB and SNe Ia
• A new holographic dark energy model in Brans-Dicke theory with logarithmic scalar field
• Crossing the Phantom divide line in the Chaplygin gas model
• Interacting entropy-corrected holographic Chaplygin gas model
• Dynamical behavior of interacting dark energy in loop quantum cosmology
• A new way to test the WIMP dark matter models
• Probing Lambda-DGP Braneworld Model