论文标题
过境宇宙学模型与零质量标量场和高衍生理论中的高红移
Transit cosmological models coupled with zero-mass scalar-field with high redshift in higher derivative theory
论文作者
论文摘要
本研究介绍了一个纯FRW宇宙学模型，其中充满了完美的流体，并在更高的衍生性重力理论中加上零质量标量场。我们已经获得了两种类型的宇宙模型，第一种是加速宇宙（幂律宇宙学），第二种是宇宙模型（幂律宇宙学），是过境相模型（双曲线扩张法）。我们已经获得了各种物理和运动学参数，并以$ h_ {0} $的观察限制值进行了讨论。 $ z_ {t} = 0.414 $获得了过境红移值，其中运输模型显示签名flipping，并且与最近的观测值一致。在我们的模型中，EOS参数的当前值$ω_{0} $跨越宇宙常数$ω__{0} = - 1 $。同样，计算了宇宙的当前年龄。
The present study deals with a flat FRW cosmological model filled with perfect fluid coupled with the zero-mass scalar field in the higher derivative theory of gravity. We have obtained two types of universe models, the first one is the accelerating universe (power-law cosmology) and the second one is the transit phase model (hyperbolic expansion-law). We have obtained various physical and kinematic parameters and discussed them with observationally constrained values of $H_{0}$. The transit redshift value is obtained $z_{t}=0.414$ where the transit model shows signature-flipping and is consistent with recent observations. In our models, the present values of EoS parameter $ω_{0}$ crosses the cosmological constant value $ω_{0}=-1$. Also, the present age of the universe is calculated.
