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arXiv 1105.5680hep-th
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Brans-Dicke理论中的相互作用鬼暗能量

Interacting Ghost Dark Energy in Brans-Dicke Theory

Esmaeil Ebrahimi, Ahmad Sheykhi

摘要:

本文在Brans-Dicke宇宙学框架下研究了暗能量的QCD鬼模型。首先,我们研究了平坦Brans-Dicke理论中的非相互作用鬼暗能量。在这种情况下,我们得到的EoS和减速参数和一个微分方程的鬼能量密度的演变。有趣的是,我们发现,非相互作用的鬼暗能量的EoS参数可以通过幻影线($w_D=-1$)提供的模型的参数被适当地选择。然后,我们将这一研究推广到了平坦和非平坦Brans-Dicke框架下的相互作用鬼暗能量,发现与采用爱因斯坦场方程相比,$w_D$到鬼态的跃迁更容易实现.

英文摘要:

We investigate the QCD ghost model of dark energy in the framework of Brans-Dicke cosmology. First, we study the non-interacting ghost dark energy in a flat Brans-Dicke theory. In this case we obtain the EoS and the deceleration parameters and a differential equation governing the evolution of ghost energy density. Interestingly enough, we find that the EoS parameter of the non-interacting ghost dark energy can cross the phantom line ($w_D=-1$) provided the parameters of the model are chosen suitably. Then, we generalize the study to the interacting ghost dark energy in both flat and non-flat Brans-Dicke framework and find out that the transition of $w_D$ to phantom regime can be more easily achieved 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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