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arXiv 1209.3147gr-qc
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非平坦宇宙中的相互作用广义鬼暗能量

Interacting generalized ghost dark energy in non-flat universe

Esmaeil Ebrahimi, Ahmad Sheykhi, Hamzeh Alavirad

摘要:

在爱因斯坦引力框架下研究了暗能量的广义量子色动力学鬼模型。首先,我们研究了平坦Friedmann-Robertson-Walker(FRW)背景下的非相互作用广义鬼暗能量。得到了广义鬼暗能量的状态方程、$w_D=p/ρ$、减速参数和演化方程。我们发现,在这种情况下,$w_D$不能越过幻影线($w_D>-1$),最终宇宙接近膨胀的de-Sitter阶段$(w_D\rightarrow-1)$。然后,我们将研究扩展到平坦和非平坦FRW宇宙中相互作用的鬼暗能量。我们发现,只要模型参数选择适当,相互作用广义鬼暗能量的状态方程参数可以越过假想线($w_D<-1$)。最后,我们使用马尔可夫链蒙特卡罗(MCMC)方法和SNIa,CMB,BAO和X射线气体质量分数的组合数据集约束模型参数。

英文摘要:

We investigate the generalized Quantum Chromodynamics (QCD) ghost model of dark energy in the framework of Einstein gravity. First, we study the non-interacting generalized ghost dark energy in a flat Friedmann-Robertson-Walker (FRW) background. We obtain the equation of state parameter, $w_D=p/ρ$, the deceleration parameter, and the evolution equation of the generalized ghost dark energy. We find that, in this case, $w_D$ cannot cross the phantom line ($w_D>-1$) and eventually the universe approaches a de-Sitter phase of expansion $(w_D\rightarrow-1)$. Then, we extend the study to the interacting ghost dark energy in both a flat and non-flat FRW universe. We find that the equation of state parameter of the interacting generalized ghost dark energy can cross the phantom line ($w_D<-1$) provided the parameters of the model are chosen suitably. Finally, we constrain the model parameters by using the Markov Chain Monte Carlo (MCMC) method and a combined dataset of SNIa, CMB, BAO and X-ray gas mass fraction.

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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