Perturbations of the Quintom Models of Dark Energy and the Effects on Observations
Perturbations of the Quintom Models of Dark Energy and the Effects on Observations
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DOI：
10.1103/physrevd.72.123515
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发表时间：
2005-07
影响因子：
5
通讯作者：
Gong-Bo Zhao;J. Xia;Mingzhe Li;Bo Feng;Xinmin Zhang
中科院分区：
文献类型：
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作者：
Gong-Bo Zhao;J. Xia;Mingzhe Li;Bo Feng;Xinmin Zhang
本文研究了五重态暗能量模型的微扰以及五重态微扰对电流观测的影响。Quintom描述了暗能量的一种情况，在这种情况下，状态方程在演化过程中越过了宇宙学常数边界w = -1。我们提出了一种新的方法来证明，传统的暗能量模型的基础上一个单一的k-本质场和完美流体不能作为五分之一，由于奇异性和经典不稳定性的扰动w=-1。一个需要添加额外的自由度，成功的五汤姆模型建设。在现实的五分模型的微扰中没有奇异性或经典不稳定性，它们可能与宇宙学常数不同。基于现实的五分模型，本文提供了一种在-1范围内参数化状态方程的暗能量模型包含微扰的方法。与假设无暗能量扰动的情形相比，我们发现，在考虑暗能量扰动的情况下，状态方程通过-1的参数空间一般会扩大。
We study in this paper the perturbations of the quintom dark energy model and the effects of quintom perturbations on the current observations. Quintom describes a scenario of dark energy where the equation of state gets across the cosmological constant boundary w = -1 during evolution. We present a new method to show that the conventional dark energy models based on a single k-essence field and perfect fluid cannot act as the quintom due to the singularities and classical instabilities of perturbations around w= -1. One needs to add extra degrees of freedom for successful quintom model building. There are no singularities or classical instabilities in perturbations of realistic quintom models and they are potentially distinguishable from the cosmological constant. Basing on the realistic quintom models in this paper we provide one way to include the perturbations for dark energy models with parametrized equation of state across -1. Compared with those assuming no dark energy perturbations, we find that the parameter space which allows the equation of state to get across -1 will be enlarged, in general, when including the perturbations.