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

Research paper by Jian-gang Hao, Xin-zhou Li

Indexed on: 01 Dec '04Published on: 01 Dec '04Published in: Astrophysics



Abstract

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.