Crossing the phantom divide in an interacting generalized Chaplygin gas

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...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2008-07, Vol.2008 (7), p.016
Main Authors: García-Compeán, H, García-Jiménez, G, Obregón, O, Ramírez, C
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COSMOLOGICAL MODELS
DENSITY
EQUATIONS OF STATE
GALACTIC EVOLUTION
MATHEMATICAL SOLUTIONS
NONLUMINOUS MATTER
SCALING
UNIVERSE
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Summary: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 throughout 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.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2008/07/016