期刊
PHYSICS LETTERS B
卷 603, 期 3-4, 页码 113-123出版社
ELSEVIER
DOI: 10.1016/j.physletb.2004.10.023
关键词
-
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据