Generalized ghost dark energy in Brans-Dicke theory

被引：16

作者：

Sheykhi, A. ^{[1
,2
,3
]}

Ebrahimi, E. ^{[3
,4
]}

Yousefi, Y. ^{[4
]}

机构：

[1] Shiraz Univ, Coll Sci, Dept Phys, Shiraz 71454, Iran

[2] Shiraz Univ, Coll Sci, Biruni Observ, Shiraz 71454, Iran

[3] RIAAM, Maragha, Iran

[4] Shahid Bahonar Univ, Dept Phys, Kerman, Iran

来源：

CANADIAN JOURNAL OF PHYSICS | 2013年 / 91卷 / 08期

关键词：

PROBE WMAP OBSERVATIONS; COSMOLOGICAL CONSTANT; LIGHT CURVES; UNIVERSE; MODEL; CONSTRAINTS; SUPERNOVAE; DYNAMICS; TACHYON; AGE;

D O I：

10.1139/cjp-2012-0531

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

It was argued that the vacuum energy of the Veneziano ghost field of QCD, in a time-dependent background, can be written in the general form, H + O(H-2), where H is the Hubble parameter. Based on this, a phenomenological dark energy model whose energy density is of the form rho = alpha H + beta H-2 was recently proposed to explain the dark energy dominated universe. In this paper, we investigate this generalized ghost dark energy model in the setup of Brans-Dicke cosmology. We study the cosmological implications of this model. In particular, we obtain the equation of state, the deceleration parameters, and a differential equation governing the evolution of this dark energy model. It is shown that the equation of state parameter of the generalized ghost dark energy can cross the phantom line (w(D) = -1) in some range of the parameters spaces.

引用

页码：662 / 667

页数：6

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