Cosmological dynamics of the tachyon with an inverse power-law potential

被引：183
作者：
Abramo, LR
Finelli, F
机构：
[1] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil
[2] CNR, IASF, Ist Astrofis Spaziale & Fis Cosmica, Sez Bologna, I-40129 Bologna, Italy
来源：
PHYSICS LETTERS B | 2003年 / 575卷 / 3-4期
基金：
巴西圣保罗研究基金会;
关键词：
D O I：
10.1016/j.physletb.2003.09.065
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We investigate tachyon dynamics with an inverse power-law potential V (psi) proportional to psi(-n). We find global attractors of the dynamics leading to a dust behaviour for n > 2 and to an accelerating universe for 0 < n less than or equal to 2. We study linear cosmological perturbations and we show that metric fluctuations are constant on large scales in both cases. In presence of an additional perfect fluid, the tachyon with this potential behaves as dust or dark energy. (C) 2003 Published by Elsevier B.V.
引用
收藏
页码：165 / 171
页数：7
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