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Interacting and Non-interacting Two-Fluid Atmosphere for Dark Energy in FRW Universe

机译:FRW宇宙中暗能量的相互作用和非相互作用两流体气氛

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The evolution of the equation of state (EoS) parameter for dark energy (DE) withinthe scope of a spatially homogeneous and isotropic Friedmann-Robertson-Walker (FRW) modelfilled with barotropic fluid and dark energy is examined. To get the deterministic solutionwe choose the scale factor a(t) = ? 1t + t2, t > 1 which yields a time dependent decelerationparameter (DP) q = ?2 2tt33?+1 1 2, representing a model which generates an accelerating phaseat the present epoch. We consider the two cases of an interacting and non-interacting two-fluid(barotropic and dark energy) scenario and obtained exact solution. It is observed that in bothinteracting and non-interacting cases, EoS parameter for DE is decreasing function of time andalways varying in quintessence region for all open, closed and flat models. The cosmic jerkparameter in our derived models is also found to be in good agreement with the recent dataof astrophysical observations under suitable conditions. The physical aspects of the model andstability of the corresponding solutions are also discussed.
机译:在充满正压流体和暗能量的空间均匀且各向同性的Friedmann-Robertson-Walker(FRW)模型的范围内,研究了暗能量(DE)的状态方程(EoS)参数的演化。为了获得确定性解,我们选择比例因子a(t)=? 1t + t2,t> 1,这将产生一个与时间有关的减速参数(DP)q =?2 2tt33?+1 1 2,代表一个在当前时期产生加速相位的模型。我们考虑了相互作用和非相互作用的两种流体(正压和暗能量)场景的两种情况,并获得了精确解。可以看出,在交互和非交互情况下,对于所有开放,封闭和平面模型,DE的EoS参数都是时间的递减函数,并且在精髓区域中总是变化。我们发现,在适当条件下,我们得出的模型中的宇宙震荡参数与天体物理观测的最新数据也很吻合。还讨论了模型的物理方面以及相应解决方案的稳定性。

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