Cosmological coincidence problem in interacting dark energy models

Details Cosmological coincidence problem in interacting dark energy models Cosmological coincidence problem in interacting dark energy models

2006-10-16

arxiv.org/abs/gr-qc/0610080v2

Phys.Rev.D74:103007,2006

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

15 pages, LaTeX. Some minor explanations are added. To be published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.74.103007

An interacting dark energy model with interaction term $Q= \lambda_m H\rho_m+\lambda_dH\rho_d$ is considered. By studying the model near the transition time, in which the system crosses the w=-1 phantom-divide-line, the conditions needed to overcome the coincidence problem is investigated. The phantom model, as a candidate for dark energy, is considered and for two specific examples, the quadratic and exponential phantom potentials, it is shown that it is possible the system crosses the w=-1 line, meanwhile the coincidence problem is alleviated, the two facts that have root in observations.

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