Attractor behavior in dilatonic(phantom) dark energy model with an especial potential  

特殊势dilatonic(鬼场)暗能量模型的吸引力行为(英文)

作　　者：魏晨星 陆惠卿 周建华 

机构地区：[1]Department of Physics, College of Sciences, Shanghai University

出　　处：《Journal of Shanghai University(English Edition)》2008年第6期489-494,共6页上海大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.10573012, 10575068);the Science Foundation of Shanghai Municipal Commission of Science and Technology (Grant No.04dz05905)

摘　　要：The dilaton in Weyl-Scale induced gravitational theory is regarded as a candidate of dark energy. When the potential of dilaton field is taken as the form Wσ ＋ σ^2e^-βσ2, that there exist attractor solutions to the canonical dilatonic dark energy model and the phontam model, and these attractors correspond to an equation of state ω = -1 and a cosmic density parameter Ωσ = 1, which are important features for a dark energy model and can fit with the current observations. We find a sufficient condition of the existence of a late time de Sitter attractor. The attractor behaviors, the evolutions of the state parameter ω and the cosmic density parameter Ω, the evolution of X （σ/σ0） and Y （σ/σ0^2） with respect to N（ln a）are shown numerically.The dilaton in Weyl-Scale induced gravitational theory is regarded as a candidate of dark energy.When the potential of dilaton field is taken as the form Wσ + σ2e-βσ2, that there exist attractor solutions to the canonical dilatonic dark energy model and the phontam model, and these attractors correspond to an equation of state ω =-1 and a cosmic density parameter Ωσ = 1, which are important features for a dark energy model and can it with the current observations.We find a suffcient condition of the existence of a late time de Sitter attractor.The attractor behaviors, the evolutions of the state parameter ω and the cosmic density parameter Ω, the evolution of X( σ/σ0)and Y(σσ/02)with respect to N(ln a) are shown numerically.

关 键 词：dark energy DILATON attractor solution PHANTOM 

分 类 号：P145.9[天文地球—天体物理]