论文标题
$λ$ CDM还活着
$Λ$CDM is alive and well
论文作者
论文摘要
$λ$ CDM型号面临着几种紧张局势，并具有最新的宇宙学数据及其精度提高。从直接距离梯子测量和宇宙微波背景（CMB）获得的哈勃常数$ h_0 $之间的不匹配是最显着的，但是物质波动的幅度也被认为是一个严重的关注，导致了模型的plethora的研究。我们首先表明，从局部探针进行的几项最近测量的组合导致对当今物质密度$ω_m$以及物质波动的幅度的严格限制，这两者都与从CMB推断的值一致。其次，我们表明，宇宙天文计时器的数据允许在$λ$ CDM型号中得出哈勃常数$ h_0 $的准确值：$ h_0 = 67.4 \ pm 1.34 $ km/s/s/mpc。这意味着，在$λ$ CDM之内，一些$ H_0 $的确定是有偏见的。考虑到哈勃常数的偏见是$λ$ cdm之内的滋扰参数，我们在与替代宇宙学模型的统计基础上检查了这样的$λ$ cdm $+ h_0 $偏差模型。我们表明，迄今为止提出的大多数现有的扩展模型在统计上取代了大多数现有的扩展模型。在第三步中，我们表明，我们获得的$ω_m$的值与SH0ES的$ H_0 $相结合，导致准确的测量$ω_m$，为宇宙学模型提供了额外的低频测试。从该测试中，大多数扩展似乎面临着新的张力，而$ H_0 \ sim 67 $的$λ$ CDM却没有。我们得出的结论是，在CEPHEIDS距离校准中具有未知偏置的标准$λ$ CDM模型代表了达成非凡协议的模型，其统计学上比以前提出的扩展名更好，其$ H_0 \ sim 73 $可以进行此类比较。 （简略）
The $Λ$CDM model faces several tensions with recent cosmological data and their increased accuracy. The mismatch between the values of the Hubble constant $H_0$ obtained from direct distance ladder measurements and from the cosmic microwave background (CMB) is the most statistically significant, but the amplitude of the matter fluctuations is also regarded as a serious concern, leading to the investigation of a plethora of models. We first show that the combination of several recent measurements from local probes leads to a tight constraint on the present-day matter density $Ω_M$ as well as on the amplitude of the matter fluctuations, both acceptably consistent with the values inferred from the CMB. Secondly, we show that the data on cosmic chronometers allow to derive an accurate value of the Hubble constant $H_0$ for $Λ$CDM models: $H_0 = 67.4 \pm 1.34$ km/s/Mpc. This implies that, within $Λ$CDM, some determinations of $H_0$ are biased. Considering a bias on the Hubble constant as a nuisance parameter within $Λ$CDM, we examine such a $Λ$CDM$+ H_0$ bias model on the same statistical grounds as alternative cosmological models. We show that the former statistically supersede most existing extended models proposed up to now. In a third step, we show that the value of $Ω_M$ we obtained, combined with $H_0$ from SH0ES, leads to an accurate measurement of $ω_M$, providing an additional low-redshift test for cosmological models. From this test, most extensions seem to be confronted with a new tension, whereas the $Λ$CDM with $H_0 \sim 67 $ has none. We conclude that a standard $Λ$CDM model with an unknown bias in the Cepheids distance calibration represents a model that reaches a remarkable agreement, statistically better than previously proposed extensions with $H_0 \sim 73 $ for which such a comparison can be performed. (abridged)
