暗能量和宇宙命运的多场快子五分模型
A multifield tachyon quintom model of dark energy and fate of the universe
摘要：
本文研究了暗能量的多场模型。我们建立了一个具有两个多标量场的暗能量模型，一个是多场快子，另一个是多场幻影快子标量。我们在相空间中考虑适合于这些模型的平方反比势对系统进行了分析。通过一个自治的动力系统的发展，临界点和他们的稳定性分析。已经观察到，这些稳定的临界点满足幂律解。继续进行分析，我们可以预测宇宙的命运。该模型的一个特点是在宇宙演化阶段影响状态方程参数w从大于负一变为小于负一。因此，这一切都是关于幻影鸿沟，这在这些模型中的宇宙演化中是决定性的。
英文摘要：
We investigate a multi-field model of dark energy in this paper. We develop a model of dark energy with two multiple scalar fields, one we consider, is a multifield tachyon and the other is multi-field phantom tachyon scalars. We make an analysis of the system in phase space by considering inverse square potentials suitable for these models. Through the development of an autonomous dynamical system, the critical points and their stability analysis is performed. It has been observed that these stable critical points are satisfied by power law solutions. Moving on towards the analysis we can predict the fate of the universe. A special feature of this model is that it affects the equation of state parameter w to alter from being it greater than negative one to be less than it during the evolutionary phase of the universe. Thus, its all about the phantom divide which turns out to be decisive in the evolution of the cosmos in these models.
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