H_0 and S_8 tensions necessitate early and late time changes to LambdaCDM
H_0 and S_8 tensions necessitate early and late time changes to LambdaCDM
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H_0 和 S_8 紧张局势需要对 LambdaCDM 进行早期和晚期时间更改
DOI：
10.1103/physrevd.107.083527
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发表时间：
2023
影响因子：
5
通讯作者：
Koushiappas, Savvas M.
中科院分区：
文献类型：
--
作者：
Clark, Steven J.;Vattis, Kyriakos;Fan, JiJi;Koushiappas, Savvas M.
仅早期或仅晚期的时间改变不足以同时解决两种紧张局势;然而，早期和晚期改变的组合可以提供两种紧张局势的解决方案。作为一个例子，我们研究了一个组合的早期暗能量，衰变暗物质模型。虽然早期的暗能量有能力解决张力，但它会导致测量结果的差异。我们发现，增加衰变暗物质有助于解决在早期暗能量模型中会增强的差异，而后者能够将差异缓解到第95百分位数的区间内。我们的研究结果表明，更倾向于组合模型，暗示早期和晚期的宇宙修改可能是必要的，以解决宇宙学的紧张局势。
An only early or only late time alteration tohas been inadequate at resolving both theandtensions simultaneously; however, a combination of early and late time alterations tocan provide a solution to both tensions. As an illustration, we examine a combined early dark energy, decaying dark matter model. While early dark energy has the ability to resolve thetension, it leads to a discrepancy inmeasurements. We show that the addition of decaying dark matter helps resolve thediscrepancy that would otherwise be enhanced in an early dark energy model, while the latter is able to relieve thedisagreement to within the 95th percentile interval. Our results show a preference for the combined model overwith, hinting that both early and late Universe modifications may be necessary to address the cosmological tensions.