Cosmology with a variable generalized Chaplygin gas

被引：46

作者：

Lu, Jianbo ^{[1
]}

机构：

[1] Dalian Univ Technol, Sch Phys & Optoelect Technol, Dalian 116024, Peoples R China

来源：

PHYSICS LETTERS B | 2009年 / 680卷 / 05期

关键词：

Variable generalized Chaplygin gas (VGCG); Unification of dark matter and dark energy; ACCELERATING UNIVERSE; CONSTRAINTS; SUPERNOVAE;

D O I：

10.1016/j.physletb.2009.09.027

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate observational constraint on the variable generalized Chaplygin gas (VGCG) model as the unification of dark matter and dark energy by using the Union supernovae sample and the baryon acoustic oscillations data. Based on the best fit parameters for VGCG model it is shown that the current value of equation of state for dark energy is W-0de = -1.08 < -1, and the universe will not end up with big rip in the future. In addition, we also discuss the evolution of several quantities in VGCG cosmology such as deceleration parameter, fractional density parameters, growth index and sound speed. Finally, the statefinder diagnostic is performed to discriminate the VGCG with other models. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：404 / 410

页数：7

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