论文标题
在广义rastall重力中暗能的宇宙演变
Cosmic evolution of dark energy in a generalized Rastall gravity
论文作者
论文摘要
在这项工作中，我们提出了一种在广义的rastall重力中进行宇宙进化的方案。在我们的方法中，暗能量的作用是由应力能量量张量的非保守扇区采取的。发现所得的宇宙进化自然是由三个阶段组成的，即辐射主导，普通物质主导，以及深色能量和暗物质主导的时代。此外，对于当前模型，与标准$λ$ CDM模型相比，宇宙的最终命运主要对初始条件不敏感。特别是，该解决方案显示了动态吸引子的属性，该属性让人联想到典型和k- essence模型。随后，避免了宇宙的巧合问题。在黑暗能量更快地演变时，与保守应力能量量张量的偏差量更为显着。另一方面，《保护法》在过去和未来的无限范围内得到了很大的恢复。解决了当前方法的含义。
In this work, we propose a scheme for cosmic evolution in a generalized Rastall gravity. In our approach, the role of dark energy is taken by the non-conserved sector of the stress energy-momentum tensor. The resultant cosmic evolution is found to naturally consists of three stages, namely, radiation dominated, ordinary matter dominated, as well as dark energy and dark matter dominated eras. Furthermore, for the present model, it is demonstrated that the eventual fate of the Universe is mostly insensitive to the initial conditions, in contrast to the standard $Λ$CDM model. In particular, the solution displays the properties of a dynamic attractor, which is reminiscent of quintessence and k-essence models. Subsequently, the cosmic coincidence problem is averted. The amount of deviation from a conserved stress energy-momentum tensor is shown to be more remarkable during the period when the dark energy evolves more rapidly. On the other hand, the conservation law is largely restored for the infinite past and future. The implications of the present approach are addressed.
