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arXiv 2107.12992astro-ph.COgr-qc
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宇宙学张力在重建引力中的印记

Imprints of cosmological tensions in reconstructed gravity

Levon Pogosian, Marco Raveri, Kazuya Koyama, Matteo Martinelli, Alessandra Silvestri, Gong-Bo Zhao, Jian Li, Simone Peirone, Alex Zucca

摘要:

由于某些数据集之间的张力,特别是哈勃张力,人们对标准$Λ$冷暗物质($Λ$ CDM)宇宙学模型的修改产生了极大的兴趣。$Λ$ CDM模型的后期修正可以用三个时间相关函数来参数化,这些函数描述了宇宙的膨胀历史以及引力对大尺度结构中光和物质的影响。我们执行的第一个联合贝叶斯重建这三个功能从最近的宇宙学观测的组合,利用理论知情的前建立在一般Horndeski类标量张量理论。这种重构是根据众所周知的$H_0$、$S_8$和$A_L$张力来解释的。我们确定的现象学特征,替代理论将需要有,以缓解一些紧张局势,并推导出重要的限制广泛的类修改后的重力模型。除此之外,我们的研究结果表明,晚期动力学暗能量和引力的修改不太可能提供哈勃张力的解决方案,或者同时解决$A_L$和$S_8$张力。

英文摘要:

There has been a significant interest in modifications of the standard $Λ$ Cold Dark Matter ($Λ$CDM) cosmological model prompted by tensions between certain datasets, most notably the Hubble tension. The late-time modifications of the $Λ$CDM model can be parametrized by three time-dependent functions describing the expansion history of the Universe and gravitational effects on light and matter in the Large Scale Structure. We perform the first joint Bayesian reconstruction of these three functions from a combination of recent cosmological observations, utilizing a theory-informed prior built on the general Horndeski class of scalar-tensor theories. This reconstruction is interpreted in light of the well-known $H_0$, the $S_8$ and the $A_L$ tensions. We identify the phenomenological features that alternative theories would need to have in order to ease some of the tensions, and deduce important constraints on broad classes of modified gravity models. Among other things, our findings suggest that late-time dynamical dark energy and modifications of gravity are not likely to offer a solution to the Hubble tension, or simultaneously solve the $A_L$ and $S_8$ tensions.

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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