Evolution of dark energy–dark matter-coupled expanding universe  

作　　者：Ti-Pei Li Mei Wu 

机构地区：[1]Department of Physics, Center for Astrophysics, Tsinghua University [2]Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences

出　　处：《Chinese Science Bulletin》2014年第33期4473-4477,共5页

基　　金：supported by the National Natural Science Foundation of China(11033003)

摘　　要：The present universe is dominated by repulsive dark energy. It is natural that the coupling between the dark energy and the attractive gravity has to be taken into account in studying the evolution of our universe. Here, we induce an evolution equation for dark energy–dark mattercoupled universe. The solutions of the dynamic equation provide a specific picture of cosmic evolution, which is well compatible with current observed evolution histories of both Hubble parameter and equation of state parameter of dark energy. In this picture, the already observed universe has undergone through three epochs—the epoch of equilibrium between gravity and dark energy at cosmological redshifts z [ 1, the phase transition epoch at z between about 0.5 and 1, and the present acceleration epoch starting from z ' 0:5. The expected matter-dominated deceleration epoch has not been seen yet, which requires future deep observations to look back upon more early universe.The present universe is dominated by repulsive dark energy. It is natural that the coupling between the dark energy and the attractive gravity has to be taken into account in studying the evolution of our universe. Here, we induce an evolution equation for dark energy-dark matter- coupled universe. The solutions of the dynamic equation provide a specific picture of cosmic evolution, which is well compatible with current observed evolution histories of both Hubble parameter and equation of state parameter of dark energy. In this picture, the already observed uni- verse has undergone through three epochs the epoch of equilibrium between gravity and dark energy at cosmo- logical redshifts z 〉 1, the phase transition epoch at z between about 0.5 and 1, and the present acceleration epoch starting from z≌ 0.5. The expected matter-domi- nated deceleration epoch has not been seen yet, which requires future deep observations to look back upon more early universe.

关 键 词：膨胀宇宙 暗能量 耦合 暗物质 演变 演化方程 动力学方程 吸引力 

分 类 号：P159[天文地球—天文学] P145.9