鬼场暗能量密度的宇宙演化  

Cosmological evolution of the ghost dark energy density

作　　者：袁通全[1] 

机构地区：[1]河池学院物理与机电工程学院,广西宜州546300

出　　处：《安徽大学学报（自然科学版）》2015年第3期41-46,共6页Journal of Anhui University(Natural Science Edition)

基　　金：广西壮族自治区自然科学基金资助项目(2011GXNSFA018140)

摘　　要：用来解释宇宙加速膨胀的鬼场暗能量近期被提出.分别从暗能量密度与哈勃函数的正比和二次函数关系出发,求解Friedman方程,推导出无量纲能量密度和态方程参量随宇宙尺度因子演化的结果.计算表明:无量纲鬼场暗能量密度在后期趋向于1而态方程参量在后期趋向于-1,呈现出宇宙学常数的形式.A ghost dark energy was recently proposed to explain the present acceleration of the universe expansion.Based on the relation between ghost dark energy and Hubbard function the Friedman equation was solved and the cosmological evolution of the ghost dark energy density and its equation of state were obtained.It was found that the dimensionless energy density of ghost tends to 1and the parameter of equation of state tends to-1in the late time presenting the form of cosmological constant.

关 键 词：鬼场暗能量 Friedman方程 态方程参量 

分 类 号：O412[理学—理论物理]