Modified Chaplygin gas as an interacting holographic dark energy model

作     者：WU YaBo, YANG WeiQiang, WANG Cong & WANG Lei Department of Physics, Liaoning Normal University, Dalian 116029, China 

作者机构：Department of Physics Liaoning Normal University Dalian 116029 China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2010年第53卷第4期

页      面：598-606页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 

基　　金：supported by the National Natural Science Foundation of China (Grant No. 10875056) the Scientific Research Foundation of the Higher Education Institute of Liaoning Province, China (Grant Nos.2007T087 and 2009R35) 

主　　题：modified Chaplygin gas interacting holographic dark energy geometrical diagnostics 

摘      要：The modified Chaplygin gas (MCG) as an interacting model of holographic dark energy in which dark energy and dark matter are coupled together is investigated in this paper. Concretely, by studying the evolutions of related cosmological quantities such as density parameter Ω, equation of state w, deceleration parameter q and transition redshift zT, we find the evolution of the universe is from deceleration to acceleration, their present values are consistent with the latest observations, and the equation of state of holographic dark energy can cross the phantom divide w = -1. Furthermore, we put emphasis upon the geometrical diagnostics for our model, i.e., the statefinder and Om diagnostics. By illustrating the evolutionary trajectories in r - s, r - q, w -w and Om planes, we find that the holographic constant c and the coupling constant b play very important roles in the holographic dark energy (HDE) model. In addition, we also plot the LCDM horizontal lines in Om diagrams, and show the discrimination between the HDE and LCDM models.