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arXiv 2006.03229gr-qc
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广义Rastall引力下暗能量的宇宙演化

Cosmic evolution of dark energy in a generalized Rastall gravity

Kai Lin, Wei-Liang Qian

摘要:

在这项工作中,我们提出了一个计划的宇宙演化在一个广义的拉斯特尔引力。在我们的方法中,暗能量的作用由应力能量-动量张量的非守恒部分承担。由此产生的宇宙演化自然包括三个阶段,即辐射主导时代、普通物质主导时代以及暗能量和暗物质主导时代。此外,对于本模型,它表明,宇宙的最终命运大多是不敏感的初始条件,与标准的$Λ$ CDM模型。特别是,该解决方案显示了动态吸引子的属性,这让人想起quintessence和k-本质模型。随后,宇宙巧合问题被避免了。在暗能量演化更快的时期,偏离守恒应力能量-动量张量的量被示出为更显着。另一方面,守恒定律在很大程度上恢复了无限的过去和未来。本方法的影响得到解决。

英文摘要:

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.

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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