A string-inspired quintom model of dark energy

A string-inspired quintom model of dark energy
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DOI:
10.1016/j.physletb.2007.05.056
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发表时间:
2007-01
期刊:
影响因子:
4.4
通讯作者:
Shuai Zhang;Bin Chen
Shuai Zhang;Bin Chen
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Shuai Zhang;Bin Chen

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在这封信中,我们提出了一个暗能量的五分模型,它有一个由拉格朗日函数给出的标量场[公式:见正文]。在β′→0的极限下,我们的模型退化为文献中考虑的快子的有效低能拉格朗日量。我们研究了该模型的宇宙学演化,明确地给出了状态方程越过宇宙学常数边界的行为。
We propose in this Letter a quintom model of dark energy with a single scalar field ϕ given by the Lagrangian [Formula: see text] . In the limit of β′→0 our model reduces to the effective low energy Lagrangian of tachyon considered in the literature. We study the cosmological evolution of this model, and show explicitly the behaviors of the equation of state crossing the cosmological constant boundary.