Evolution of Variable Generalized Chaplygin Gas

We consider the variable Generalized Chaplygin gas (VGCG) proposal for unification of dark matter and dark energy with p=p_de and ρ=ρ_de +ρ_de. The equation of state of the VGCG is given by p=-A₀ a^-n/ρ^α, where a is the scale factor. Some cosmological quantities such as the fractional contributions of different components of the universe Ω_i (i respectively denotes baryons, dark matter and dark energy) to the critical density, the deceleration parameter q are all obtained. The transition from deceleration to acceleration is described in this model. In addition, we find the behaviour of variable Generalized Chaplgin gas is similar to dust-like matter at early times and will be quiessence or phantom at late stage.