Cosmological scaling solutions of multiple tachyon fields with inverse square potentials

被引：58

作者：

Guo, ZK ^{[1
]}

Zhang, YZ ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2004年 / 08期

关键词：

cosmology of theories beyond the SM; inflation;

D O I：

10.1088/1475-7516/2004/08/010

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the cosmological dynamics of multiple tachyon fields with inverse square potentials. A phase-space analysis of the spatially flat FRW models shows that there exist power-law cosmological scaling solutions. We study the stability of the solutions only for the case of two tachyon fields and find that the potential - kinetic- scaling solution is a global attractor. However, in the presence of a barotropic fluid the solution is an attractor only in one region of the parameter space, and the tracking solution is an attractor in the other region. We briefly discuss the physical consequences of these results.

引用

页码：219 / 227

页数：9

共 30 条

[1] Cosmological dynamics of the tachyon with an inverse power-law potential [J].

Abramo, LR ;

Finelli, F .

PHYSICS LETTERS B, 2003, 575 (3-4) :165-171

[2]

AGUIRREGABIRIA JM, 2004, HEPTH0402190

[3] Supergravity brane worlds and tachyon potentials [J].

Bazeia, D ;

Brito, FA ;

Nascimento, JR .

PHYSICAL REVIEW D, 2003, 68 (08)

[4]

Bento MC, 2003, PHYS REV D, V67, DOI [10.1103/PhysRevD.67.063511, 10.1103/PhysRevD.67.023504]

[5]

CALCAGNI G, 2004, HEPPH0402126

[6] Inflation from a tachyon fluid? [J].

Fairbairn, M ;

Tytgat, MHG .

PHYSICS LETTERS B, 2002, 546 (1-2) :1-7

[7] Cosmological evolution of the rolling tachyon [J].

Gibbons, GW .

PHYSICS LETTERS B, 2002, 537 (1-2) :1-4

[8] Inflationary attractor in the braneworld scenario [J].

Guo, ZK ;

Zhang, HS ;

Zhang, YZ .

PHYSICAL REVIEW D, 2004, 69 (06) :7

[9] Inflationary attractor from tachyonic matter [J].

Guo, ZK ;

Piao, YS ;

Cai, RG ;

Zhang, YZ .

PHYSICAL REVIEW D, 2003, 68 (04)

[10] Cosmological scaling solutions and cross-coupling exponential potential [J].

Guo, ZK ;

Piao, YS ;

Cai, RG ;

Zhang, YZ .

PHYSICS LETTERS B, 2003, 576 (1-2) :12-17

← 1 2 3 →