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arXiv 2209.06217astro-ph.COhep-phhep-th
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Sigma-8 张力是一种拖拽效应

The Sigma-8 Tension is a Drag

Vivian Poulin, José Luis Bernal, Ely Kovetz, Marc Kamionkowski

AI总结:

本文提出通过暗物质与暗能量间的摩擦拖拽效应,在不改变膨胀历史的情况下解决低红移与高红移物质聚集测量不一致的 Sigma-8 张力问题,并给出探测建议。

摘要:

低红移($z\lesssim 0.5-1$)弱引力透镜测量,以参数 $S_8$ 量化,所偏好的物质聚集强度弱于由宇宙微波背景(CMB)测量确定参数的标准 $Λ$CDM 宇宙学模型预期。然而,由 CMB 透镜探测的更高红移物质聚集幅度与 $Λ$CDM 一致。这一明显悖论暗示 $S_8$ 张力与物质到暗能量主导的转变之间存在联系。我们在此表明,通过引入暗物质与暗能量之间的摩擦,且不改变受到严格约束的膨胀历史,该张力可以得到解决。低 $S_8$ 测量值(在此单参数模型中,以 $\gtrsim3σ$ 置信度)偏好非零拖拽,导致在物质到暗能量主导转变附近低红移功率受到抑制。我们提出了进一步探测该情景的方法。

英文摘要:

Measurements of weak gravitational lensing at low redshifts ($z\lesssim 0.5-1$), quantified by the parameter $S_8$, favor weaker matter clustering than that expected from the standard $Λ$CDM cosmological model with parameters determined by cosmic microwave background (CMB) measurements. However, the amplitude of matter clustering at higher redshifts, as probed by lensing of the CMB, is consistent with $Λ$CDM. This apparent paradox suggests a connection between the $S_8$ tension and the transition from matter to dark-energy domination. Here we show that the tension can be resolved by introducing a friction between dark matter and dark energy without altering the tightly constrained expansion history. The low-$S_8$ measurements favor (at $\gtrsim3σ$, in this one parameter model) a non-zero drag leading to a suppression of low-redshift power right around the transition from matter to dark-energy domination. We suggest ways to further probe the scenario.

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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