论文标题
Sigma-8张力是阻力
The Sigma-8 Tension is a Drag
论文作者
论文摘要
低红移（$ z \ lyssim 0.5-1 $）的弱重力镜头的测量，由参数$ s_8 $量化，比标准$ CDM宇宙学模型的较弱的物质聚类相比，具有由宇宙微波背景（CMB）测量的参数所预期的。但是，通过CMB的镜头探测，在较高红移处的物质聚类幅度与$λ$ CDM一致。这种明显的悖论表明，$ s_8 $张力与从物质到黑暗能源统治之间的过渡之间存在联系。在这里，我们表明可以通过在不改变严格约束的扩张历史的情况下引入暗物质和暗能量之间的摩擦来解决张力。低 - $ S_8 $测量值（在此参数模型中为$ \gtrsim3σ$）一个非零阻力，导致抑制从物质到黑暗能源统治的过渡时抑制低频功率。我们建议方法进一步探究场景。
Measurements of weak gravitational lensing at low redshifts ($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.
