Crossing the phantom divide in an interacting generalized Chaplygin gas

Abstract

Unified generalized Chaplygin gas models assuming an interaction between dark energy and dark matter fluids have been previously proposed. Following these ideas, we consider a particular relation between dark densities, which allows the possibility of a time varying equation of state for dark energy that crosses the phantom divide at a recent epoch. Moreover, these densities decay during all the evolution of the Universe, avoiding a Big Rip. We find also a scaling solution, i.e. these densities are asymptotically proportional in the future, which contributes to the solution of the coincidence problem.

Improved version, 10 pages, 4 figures, References added

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• Dynamics of interacting dark energy
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• Non-minimally coupled canonical, phantom and quintom models of holographic dark energy
• Phase-space analysis of interacting phantom cosmology
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• Phantom evolution in power-law potentials
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• Theoretical Limits on the Equation-of-State Parameter of Phantom Cosmology
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• Quintom dark energy models with nearly flat potentials
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• Generalized Holographic Dark Energy Model
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• Interacting Cosmological Fluids and the Coincidence Problem
• Extended Chaplygin Gas in Horava-Lifshitz Gravity
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