Transient and late time attractor tachyon dark energy: Can we distinguish it from quintessence?

被引：29
|
作者：
Ali, Amna [1 ]
Sami, M. [1 ]
Sen, A. A. [1 ]
机构：
[1] Jamia Millia Islamia, Ctr Theoret Phys, New Delhi 110025, India
来源：
PHYSICAL REVIEW D | 2009年 / 79卷 / 12期
关键词：
COSMOLOGICAL CONSTANT; DYNAMICS; COINCIDENCE; UNIVERSE; FIELD;
D O I：
10.1103/PhysRevD.79.123501
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The string inspired tachyon field can serve as a candidate of dark energy. Its equation of state parameter w varies from 0 to -1. In the case of tachyon field potential V(phi) -> 0 slower (faster) than 1/phi(2) at infinity, dark energy (dark matter) is a late time attractor. We investigate the tachyon dark energy models under the assumption that w is close to -1. We find that all the models exhibit unique behavior around the present epoch which is exactly the same as that of the thawing quintessence.
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页数：7
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