Crossing the phantom divide in an interacting generalized Chaplygin gas

Details Crossing the phantom divide in an interacting generalized Chaplygin gas Crossing the phantom divide in an interacting generalized Chaplygin gas

2007-10-23

arxiv.org/abs/0710.4283v3

JCAP0807:016,2008

Physics

High Energy Physics

High Energy Physics - Theory

Improved version, 10 pages, 4 figures, References added

Scientific paper

10.1088/1475-7516/2008/07/016

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.

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