Cosmological coincidence problem in interacting dark energy models

Abstract

An interacting dark energy model with interaction term $Q={\lambda }_{m}H{\rho }_m+{\lambda }_{d}H{\rho }_d$ 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.

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

References in corpus (3)

• Cosmological Evolution of a Quintom Model of Dark Energy
• Can dark energy evolve to the Phantom?
• Cosmological Evolution of Interacting Phantom Energy with Dark Matter

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• Quantum Stability of a w < - 1 Phase of Cosmic Acceleration
• The Growth of Structure in Interacting Dark Energy Models
• Interacting Modified Variable Chaplygin Gas in Non-flat Universe
• Interacting Dark Energy with Inhomogeneous Equation of State
• Schwarzschild black hole and the generalized second law in phantom-dominated universe
• A Note on Gravitational Baryogenesis
• The Coincidence Problem and Interacting Holographic Dark Energy
• The phase-space of generalized Gauss-Bonnet dark energy
• Asymptotic behavior of w in general quintom model
• Crossing the phantom divide line in the Holographic dark energy model in a closed universe
• A quantitative criteria for the coincidence problem
• Cosmic acceleration from interaction of ordinary fluids