A unified approach to scaling solutions in a general cosmological background

被引:149
作者
Tsujikawa, S [1 ]
Sami, M
机构
[1] Gunma Natl Coll Technol, Dept Phys, Gunma 3718530, Japan
[2] UCAA, Pune 411007, Maharashtra, India
关键词
D O I
10.1016/j.physletb.2004.10.023
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Our ignorance about the source of cosmic acceleration has stimulated study of a wide range of models and modifications to gravity. Cosmological scaling solutions in any of these theories are privileged because they represent natural backgrounds relevant to dark energy. We study scaling solutions in a generalized background H-2 proportional to rho(T)(n) in the presence of a scalar field phi and a barotropic perfect fluid, where H is a Hubble rate and rho(T) is a total energy density. The condition for the existence of scaling solutions restricts the form of Lagrangian to be p = X-1/n g(Xe-nlambdaphi), where X = -g(munu)delta(mu)phidelta(nu)phi/2 and g is an arbitrary function. This is very useful to find out scaling solutions and corresponding scalar-field potentials in a broad class of dark energy models including (coupled)-quintessence, ghost-type scalar field, tachyon and k-essence. We analytically derive the scalar-field equation of state w(phi) and the fractional density Omega(phi) and apply it to a number of dark energy models. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:113 / 123
页数:11
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