论文标题
有证据表明宇宙更热吗？
Is there evidence for a hotter Universe?
论文作者
论文摘要
宇宙微波背景（CMB）的当前温度的测量，$ T_0 = 2.72548 \ pm 0.00057 $ K（1 $σ$），是由Far-In-Frared绝对分光光度计（FIRAS）制造的，是宇宙学中有史以来最精确的测量值之一。另一方面，假设标准$λ$ CDM型号的估计值是从CMB温度波动的测量值获得的估计值，与低降低，独立的观测值相比，标准$λ$ CDM型号显示出较大（$4.1σ$）的紧张。最近，一些作者认为，$ t_0 $的变化略有变化可以减轻或解决$ h_0 $张力问题。在这里，我们通过对当前可用的温度红移$ t（z）$测量进行独立的分析来调查较热或更冷的宇宙的证据。我们的分析（参数和非参数）与FIRAS的测量结果达成了良好的协议，并且从$ t_0 $值中$ \ gtrsim1.9σ$的差异为解决了$ h_0 $张力所需的$ T_0 $值。该结果加强了这样一个想法，即$ H_0 $张紧问题的解决方案实际上需要更好地了解$ H_0 $测量值的系统错误或新物理学。
The measurement of present-day temperature of the Cosmic Microwave Background (CMB), $T_0 = 2.72548 \pm 0.00057$ K (1$σ$), made by the Far-InfraRed Absolute Spectrophotometer (FIRAS), is one of the most precise measurements ever made in Cosmology. On the other hand, estimates of the Hubble Constant, $H_0$, obtained from measurements of the CMB temperature fluctuations assuming the standard $Λ$CDM model exhibit a large ($4.1σ$) tension when compared with low-redshift, model-independent observations. Recently, some authors argued that a slightly change in $T_0$ could alleviate or solve the $H_0$-tension problem. Here, we investigate evidence for a hotter or colder universe by performing an independent analysis from currently available temperature-redshift $T(z)$ measurements. Our analysis (parametric and non-parametric) shows a good agreement with the FIRAS measurement and a discrepancy of $\gtrsim 1.9σ$ from the $T_0$ values required to solve the $H_0$ tension. This result reinforces the idea that a solution of the $H_0$-tension problem in fact requires either a better understanding of the systematic errors on the $H_0$ measurements or new physics.
