THE DYNAMICS OF TACHYON FIELD WITH AN INVERSE SQUARE POTENTIAL IN LOOP QUANTUM COSMOLOGY

被引：10
|
作者：
Huang, Fei [1 ]
Zhu, Jian-Yang [1 ]
Xiao, Kui [2 ]
机构：
[1] Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China
[2] Hunan Inst Technol, Dept Basic Teaching, Hengyang 421002, Peoples R China
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS D | 2013年 / 22卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Loop quantum cosmology; tachyon field; stability; quantum geometry effect;
D O I：
10.1142/S0218271813500302
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The dynamical behavior of tachyon field with an inverse potential is investigated in loop quantum cosmology. It reveals that the late-time behavior of tachyon field with this potential leads to a power-law expansion. In addition, an additional barotropic perfect fluid with the adiabatic index 0 < gamma < 2 is added and the dynamical system is shown to be an autonomous one. The stability of this autonomous system is discussed using phase plane analysis. There exist up to five fixed points with only two of them possibly stable. The two stable node (attractor) solutions are specified and their cosmological indications are discussed. For the tachyon dominated solution, the further discussion is stretched to the possibility of considering tachyon field as a combination of two parts which respectively behave like dark matter and dark energy.
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页数：15
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