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arXiv 2004.02937astro-ph.CO
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哈勃张力和CMB异常冷点的一般解释

A common explanation of the Hubble tension and anomalous cold spots in the CMB

András Kovács, Róbert Beck, István Szapudi, István Csabai, Gábor Rácz, László Dobos

摘要:

标准宇宙学范式讲述了一个令人放心的故事,即宇宙目前由神秘的暗能量成分主导。令人不安的是,它的普遍解释能力最近受到了挑战,首先是哈勃常数值中的$\sim4σ$张力。另一个研究较少的异常是重复观察到的集成Sachs-Wolfe印记$\sim5\times$强于来自R>100 $Mpc/h$超结构的$Λ$ CDM模型中的预期。在这里,我们表明,非均匀的AvERA模型的新兴曲率是能够告诉一个看似合理的,但从根本上不同的故事,解释两个观测异常没有暗能量。我们证明,虽然在宇宙微波背景温度图中R>100 $Mpc/h$超空洞的堆叠印记可以区分AvERA和$Λ$ CDM模型,但使用替代空洞定义和堆叠方法可能会隐藏它们的特征差异。测试极端情况,我们还表明,CMB冷点可以合理地解释在AvERA模型作为一个ISW印记。AvERA图中的最冷点与多个低$z$超空洞对齐,R>100 $Mpc/h$和中心欠密度$δ_{0}\approx-0.3$,类似于在冷点区域观察到的大尺度星系密度场。因此,我们得出结论,超空的异常印记很可能是煤矿中的金丝雀,现有的观测证据暗能量应重新解释,以进一步测试替代模型。

英文摘要:

The standard cosmological paradigm narrates a reassuring story of a universe currently dominated by an enigmatic dark energy component. Disquietingly, its universal explaining power has recently been challenged by, above all, the $\sim4σ$ tension in the values of the Hubble constant. Another, less studied anomaly is the repeated observation of integrated Sachs-Wolfe imprints $\sim5\times$ stronger than expected in the $Λ$CDM model from R>100 $Mpc/h$ super-structures. Here we show that the inhomogeneous AvERA model of emerging curvature is capable of telling a plausible albeit radically different story that explains both observational anomalies without dark energy. We demonstrate that while stacked imprints of R>100 $Mpc/h$ supervoids in cosmic microwave background temperature maps can discriminate between the AvERA and $Λ$CDM models, their characteristic differences may remain hidden using alternative void definitions and stacking methodologies. Testing the extremes, we then also show that the CMB Cold Spot can plausibly be explained in the AvERA model as an ISW imprint. The coldest spot in the AvERA map is aligned with multiple low-$z$ supervoids with R>100 $Mpc/h$ and central underdensity $δ_{0}\approx-0.3$, resembling the observed large-scale galaxy density field in the Cold Spot area. We hence conclude that the anomalous imprint of supervoids may well be the canary in the coal mine, and existing observational evidence for dark energy should be re-interpreted to further test alternative models.

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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