论文标题
广义rastall重力的动态系统表示
A dynamical system representation of generalized Rastall gravity
论文作者
论文摘要
在这项工作中，我们研究了广义Rastall Gravity（GRG）的相位空间分析，该分析最近被引入是对Rastall Gravity（RG）原始版本的修改。在GRG中，耦合参数具有动力学特征，并且可能扮演黑暗能量（DE）的作用，该功能负责目前的宇宙加速扩展。我们的调查表明，这种对一般相对论（GR）的这种修改承认，稳定的临界点对应于宇宙的晚期加速。假设暗物质（DM）和超偏好的完美流体（辐射）作为宇宙成分，我们发现基础模型呈现出可行的宇宙进化序列，从辐射统治的时代开始，然后通过DM统治，并最终达到了晚期DE主导的时代。此外，考虑到由于总能量密度内的空间曲率而引起的贡献会导致其增长模式，以使其当前值与最近观察结果中报道的值一致。我们还提供了模型的数值模拟，该模型专门为我们的动态系统表示。这些研究表明，GRG描述了宇宙的当前加速扩张的能力。
In this work we study the phase-space analysis of generalized Rastall gravity (GRG) which has recently been introduced as a modification to the original version of Rastall gravity (RG). In GRG, the coupling parameter assumes a dynamical feature and may play the role of dark energy (DE) which is responsible for the present accelerating expansion of the Universe. Our investigation shows that such a modification of General Relativity (GR) admits a stable critical point corresponding to the late time accelerated expansion of the Universe. Assuming both dark matter (DM) and an ultra-relativistic perfect fluid (radiation) as the cosmic ingredients, we find that the underlying model presents a viable sequence of cosmic evolution, beginning from radiation dominated era passing then through DM domination and finally reaches the late time DE dominated era. Moreover, taking into account the contribution due to the spatial curvature within the total energy density leads to a growing mode for it in such a way that its present values are consistent with those reported in recent observations. We also present a numerical simulation of the model which particularizes our dynamical system representation. These studies demonstrate the ability of GRG to describe the present accelerated expansion of the Universe.
