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arXiv 2201.02251gr-qcastro-ph.COhep-phhep-th
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重整化群中含有变量$G$和$Λ$的Swiss-cheese宇宙学

Swiss-cheese cosmologies with variable $G$ and $Λ$ from the renormalization group

Fotios K. Anagnostopoulos, Alfio Bonanno, Ayan Mitra, Vasilios Zarikas

摘要:

对于暗能量和暗物质的本质,人们仍然缺乏令人信服的解释。在最近的工作中,一个RG改进的瑞士奶酪宇宙学的宇宙学常数依赖于\sch半径已被证明是一个有前途的模型来解释所观察到的宇宙加速。在这项工作中,我们扩展了这个模型,以考虑牛顿常数$G$和宇宙学常数$Λ$根据IR-不动点假设的组合标度。我们将证明,我们的模型很容易产生所观察到的最近从减速到加速的通道,而不需要额外的能量尺度,外来场或微调。为了检验这一概念的普遍性,我们分析了两种不同的标度关系,并证明了它们都与$Λ$ CDM宇宙学非常一致。我们还表明,我们的模型满足观测局部约束$\dot{G}/G$。

英文摘要:

A convincing explanation for the nature of the dark energy and dark matter is still missing. In recent works a RG-improved swiss-cheese cosmology with an evolving cosmological constant dependent on the \sch radius has been proven to be a promising model to explain the observed cosmic acceleration. In this work we extend this model to consider the combined scaling of the Newton constant $G$ and the cosmological constant $Λ$ according to the IR-fixed point hypothesis. We shall show that our model easily generates the observed recent passage from deceleration to acceleration without need of extra energy scales, exotic fields or fine tuning. In order to check the generality of the concept, two different scaling relations have been analysed and we proved that both are in very good agreement with $Λ$CDM cosmology. We also show that our model satisfies the observational local constraints on $\dot{G}/G$.

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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