Phantom-like GCG and the constraints of its parameters via cosmological dynamics

Details Phantom-like GCG and the constraints of its parameters via cosmological dynamics Phantom-like GCG and the constraints of its parameters via cosmological dynamics

2004-04-07

arxiv.org/abs/astro-ph/0404154v3

Phys.Lett. B606 (2005) 7-11

Astronomy and Astrophysics

Astrophysics

12 pages, 4 eps figures. Final version to appear in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2004.11.079

We extend the equation of state of GCG (Generalized Chaplygin Gas) to $w<-1$ regime and show, from the point of view of dynamics, that the parameters of GCG should be in the range of $0<\alpha<1$. Also, dynamical analysis indicate that the phase $w_{g}=-1$ is a dynamical attractor and the equation of state of GCG approaches it from either $w_{g}>-1$ or $w_{g}<-1$ depending on the choice of its initial cosmic density parameter and the ratio of pressure to critical energy density.

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