Cosmological evolution of a quintom model of dark energy

被引：667
|
作者：
Guo, ZK
Piao, YS
Zhang, XM
Zhang, YZ
机构：
[1] CCAST, World Lab, Beijing 100080, Peoples R China
[2] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
[3] Chinese Acad Sci, Interdisciplinary Ctr Theoret Studies, Beijing 100080, Peoples R China
[4] Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
来源：
PHYSICS LETTERS B | 2005年 / 608卷 / 3-4期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1016/j.physletb.2005.01.017
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We investigate in this Letter the cosmological evolution of a dark energy model with two scalar fields where one of the scalar has canonical kinetic energy and another scalar has negative kinetic energy term. For such a system with exponential potentials we find that during the evolution of the universe the equation of state w changes from w greater than or equal to -1 to w < -1, which is consistent with the recent observations. A phase-plane analysis shows that the "phantom"-dominated scaling solution is the stable late-time attractor of this type of models. (C) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：177 / 182
页数：6
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