Cosmological evolution of "hessence" dark energy and avoidance of the big rip
Cosmological evolution of "hessence" dark energy and avoidance of the big rip
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DOI：
10.1103/physrevd.72.123507
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发表时间：
2005-09
影响因子：
5
通讯作者：
Hao Wei;R. Cai
中科院分区：
文献类型：
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作者：
Hao Wei;R. Cai
近年来，人们提出了许多状态方程参数可以跨越幻影分界线w（de）=-1的暗能量模型。在以前的论文[H.韦河，巴西-地G. Cai，和D. F. Zeng，Classical Quantum Gravity 22，3189（2005）]，我们提出了一个名为hessence的模型，其中非正则复标量场扮演暗能量的角色。本文研究了本质暗能量的宇宙学演化。我们考虑两种情况：一种是具有指数势的hessence场，另一种是具有（逆）幂律势的hessence场。我们分别研究了具有四种不同相互作用形式的hessence与背景理想流体的动力学系统。研究发现，在hessence模型中，即使在最一般的情况下，除了特定的势和相互作用形式之外，也不会出现大裂口。
Recently, many dark energy models whose equation-of-state parameter can cross the phantom divide w(de)=-1 have been proposed. In a previous paper [H. Wei, R. G. Cai, and D. F. Zeng, Classical Quantum Gravity 22, 3189 (2005)], we suggest such a model named hessence, in which a noncanonical complex scalar field plays the role of dark energy. In this work, the cosmological evolution of the hessence dark energy is investigated. We consider two cases: one is the hessence field with an exponential potential, and the other is with a (inverse) power-law potential. We separately investigate the dynamical system with four different interaction forms between hessence and background perfect fluid. It is found that the big rip never appears in the hessence model, even in the most general case, beyond particular potentials and interaction forms.