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arXiv 0905.0241gr-qc
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框架比较:非极小暗能量模型的Jordan框架与Einstein框架

Comparison of Frames: Jordan vs Einstein Frame for a Non-minimal Dark Energy Model

Kourosh Nozari, S. Davood Sadatian

摘要:

我们建立了一个暗能量模型,其中一个非最小耦合到引力的标量场扮演着暗分量的角色。我们比较宇宙学的后果,这种非最小耦合的标量场和引力的精神,在约旦和爱因斯坦框架的暗能量范例。在这两种框架下,比较了一些重要问题,如幻影分界线交叉、弹跳解的存在性和解的稳定性。我们证明了当非最小耦合标量场在Jordan坐标系下是一个合适的暗能量分量时,它具有实现幻影分界线穿越的能力,而它在Einstein坐标系下的共形变换则没有这种能力.从Jordan坐标系到Einstein坐标系的共形变换将暗能量分量的状态参数方程变换为具有重新定义的标量场的最小形式,并且在这种情况下,不可能实现具有可能穿过幻影分界线的幻影相位。

英文摘要:

We construct a dark energy model where a scalar field non-minimally coupled to gravity plays the role of the dark component. We compare cosmological consequences of this non-minimal coupling of the scalar field and gravity in the spirit of the dark energy paradigm in Jordan and Einstein frames. Some important issues such as phantom divide line crossing, existence of the bouncing solutions and the stability of the solutions are compared in these two frames. We show that while a non-minimally coupled scalar field in the Jordan frame is a suitable dark energy component with capability to realize phantom divide line crossing, its conformal transformation in the Einstein frame has not this capability. The conformal transformation from Jordan frame to Einstein frame transforms the equation of state parameter of the dark energy component to its minimal form with a redefined scalar field and in this case it is impossible to realize a phantom phase with possible crossing of the phantom divide line.

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