arXiv 0909.49112009-09-27astro-ph.CO

Brans-Dicke理论中的新图形暗能量

New Agegraphic Dark Energy in Brans-Dicke Theory

Xiang-Lai Liu, Xin Zhang

备注：: 15 pages, 4 figures
发表信息：: Commun. Theor. Phys.52:761-768, 2009
DOI：: 10.1088/0253-6102/52/4/37

摘要：

本文在爱因斯坦广义相对论的自然推广Brans-Dicke理论框架下研究了新的年龄暗能量模型。在这个框架下，新的年龄图暗能量密度的形式为$ρ_{q} =3n^2 Φ(t)η^{-2}$，其中$η$是宇宙的共形年龄，$Φ(t)$是代表随时间变化的牛顿常数的倒数的Brans-Dicke标量场。在Brans-Dicke理论中，我们导出了新年龄暗能量的状态方程和宇宙的减速参数。非常有趣的是，在Brans-Dicke理论中，年龄暗能量实现了类似五等分的行为，即，其状态方程在演化过程中穿过体模分界线$w=-1$。我们还比较了Brans-Dicke理论和Einstein理论中年龄记录暗能量模型的情况。此外，在Brans-Dicke理论的框架下，我们讨论了新的具有相互作用的年龄图暗能量模型。

英文摘要：

In this paper, we investigate the new agegraphic dark energy model in the framework of Brans-Dicke theory which is a natural extension of the Einstein's general relativity. In this framework the form of the new agegraphic dark energy density takes as $ρ_{q} =3n^2 Φ(t)η^{-2}$, where $η$ is the conformal age of the universe and $Φ(t)$ is the Brans-Dicke scalar field representing the inverse of the time-variable Newton's constant. We derive the equation of state of the new agegraphic dark energy and the deceleration parameter of the universe in the Brans-Dicke theory. It is very interesting to find that in the Brans-Dicke theory the agegraphic dark energy realizes quintom-like behavior, i.e., its equation of state crosses the phantom divide $w=-1$ during the evolution. We also compare the situation of the agegraphic dark energy model in the Brans-Dicke theory with that in the Einstein's theory. In addition, we discuss the new agegraphic dark energy model with interaction in the framework of the Brans-Dicke theory.

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