A string-inspired quintom model of dark energy

被引：100
|
作者：
Cai, Yi-Fu [1 ]
Li, Mingzhe
Lu, Han-Xin
Piao, Yun-Song
Qiu, Taotao
Zhang, Xinmin
机构：
[1] Chinese Acad Sci, Inst High Energy Phys, POB 918-4, Beijing 100049, Peoples R China
[2] Heidelberg Univ, Inst Theoret Phys, D-69120 Heidelberg, Germany
[3] Univ Bielefeld, Fak Phys, D-33615 Bielefeld, Germany
[4] Univ Sci & Technol China, Interdisciplinary Ctr Theoret Study, Hefei 230026, Anhui, Peoples R China
[5] Chinese Acad Sci, Grad Sch, Coll Phys Sci, Beijing 100049, Peoples R China
来源：
PHYSICS LETTERS B | 2007年 / 651卷 / 01期
基金：
中国国家自然科学基金; 美国国家科学基金会;
关键词：
D O I：
10.1016/j.physletb.2007.05.056
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We propose in this Letter a quintom model of dark energy with a single scalar field phi given by the Lagrangian L = -V(phi)(1 -alpha'/del(mu)phi del(mu) phi + beta'phi square phi)(1/2). In the limit of beta' -> 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. (C) 2007 Elsevier B.V. All riahts reserved.
引用
收藏
页码：1 / 7
页数：7
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