THE VARIABLE GENERALIZED CHAPLYGIN GAS MODEL WITH INTERACTION

作者：Ya Bo Wu, Xiu Yi Yang, Jing He, Ming Hui Fu · 发表于：Modern Physics Letters A · 年份：2008 · DOI：10.1142/s021773230802358x · 被引用次数：8 · 研究领域：Cosmology and Gravitation Theories、Dark Matter and Cosmic Phenomena、Galaxies: Formation, Evolution, Phenomena

In this paper a variable generalized Chaplygin gas (VGCG) proposal for unification of dark matter and dark energy is considered, in which dark energy interacts with dark matter. The equation of state of the VGCG is given by p = -A 0 a -n /ρ α , where a is the scale factor. By calculations some cosmological quantities such as density parameters of baryons, dark matter and dark energy as well as the deceleration parameter are all obtained. Furthermore, the transition from deceleration to acceleration is described and the interaction between dark energy and dark matter is considered in this model. We find the behavior of VGCG is similar to dust-like matter at early times and will be quintessence or phantom at late stage. In addition the evolution trajectory of the VGCG model in the statefinder parameter s-r plane is plotted and the discrimination between this scenario and the generalized Chaplygin gas (GCG) model is illustrated.