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arXiv 0907.5458hep-th
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Brans-Dicke理论中的相互作用全息暗能量

Interacting holographic dark energy in Brans-Dicke theory

Ahmad Sheykhi

摘要:

本文在Brans Dicke宇宙学框架下研究了相互作用全息能量密度的宇宙学应用。得到了全息暗能量在非平坦宇宙中的状态方程和减速参数。作为系统的红外截止,我们选择在视界球面上测量的事件视界半径,定义为$L=ar(t)$。我们发现,Brans-Dicke场与全息暗能量的结合可以容纳\textit{noninteracting}全息暗能量状态方程的$w_D = -1 $交叉。当考虑到暗能量和暗物质之间的相互作用时,$w_D$向幻影态的转变比采用爱因斯坦场方程更容易解释。

英文摘要:

We study cosmological application of interacting holographic energy density in the framework of Brans-Dicke cosmology. We obtain the equation of state and the deceleration parameter of the holographic dark energy in a non-flat universe. As system's IR cutoff we choose the radius of the event horizon measured on the sphere of the horizon, defined as $L=ar(t)$. We find that the combination of Brans-Dicke field and holographic dark energy can accommodate $w_D = -1 $ crossing for the equation of state of \textit{noninteracting} holographic dark energy. When an interaction between dark energy and dark matter is taken into account, the transition of $w_D$ to phantom regime can be more easily accounted for than when resort to the Einstein field equations is made.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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