Cosmological evolution of a quintom model of dark energy
Cosmological evolution of a quintom model of dark energy
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DOI：
10.1016/j.physletb.2005.01.017
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发表时间：
2004-10
影响因子：
4.4
通讯作者：
Zongkuan Guo;Yun-song Piao;Xinmin Zhang;Yuan-zhong Zhang
中科院分区：
文献类型：
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作者：
Zongkuan Guo;Yun-song Piao;Xinmin Zhang;Yuan-zhong Zhang
本文研究了具有两个标量场的暗能量模型的宇宙学演化，其中一个标量具有正则动能，另一个标量具有负动能项。对于这样一个具有指数势的系统，我们发现在宇宙的演化过程中，状态方程w从w小于或等于−1变化到w<−1，这与最近的观察一致。相平面分析表明，“幻影”主导的标度解是这类模型的稳定的后期吸引子。
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⩾−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.