Statefinder Parameters for Coupled Quintessence Scenario in a Power Law Case  

作　　者：ZHANG Xin 

机构地区：[1]Institute of High Energy Physics, the Chinese Academy of Sciences, P.O. Box 918(4), Beijing 100049, China [2]Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Communications in Theoretical Physics》2005年第3X期573-576,共4页理论物理通讯（英文版）

基　　金：国家自然科学基金

摘　　要：We investigate a coupled quintessence scenario, which can provide a natural solution to the cosmic coincidence problem. We assume that the mass of dark matter particles depends on a power law function of the scalar field associated to dark energy and meanwhile the scalar field evolves in a power law potential. Since the dynamics of this system is dominated by an attractor solution, the mass of dark matter particles is forced to change with time as to ensure that the ratio between the energy densities of dark matter and dark energy becomes a constant at late times,and one thus solves the cosmic coincidence problem naturally. We then apply a statefinder diagnostic to this coupled quintessence scenario. It is shown that the evolving trajectory of this scenario in the s-r diagram is quite different from those of other dark energy models.

关 键 词：coupled quintessence scenario power-law case attractor solution statefinder diagnostic 

分 类 号：O314[理学—一般力学与力学基础]