论文标题
哈勃常数趋势下降的证据
Evidence of a decreasing trend for the Hubble constant
论文作者
论文摘要
当前从本地距离梯子和宇宙微波背景衍生的哈勃常数$ H_0 $之间的差异是宇宙学中最关键的问题之一，因为它可能表明了未知的系统或新物理学。在这里，我们提出了一种新型的非参数方法，用于估计哈勃常数作为红移的函数。我们通过将协方差矩阵对角线化建立了哈勃常数演变的独立估计。从IA型超新星和观察到的哈勃参数数据中，发现哈勃常数的下降趋势，显着性为5.6 $σ$置信度。在低红移时，它的值与从局部距离梯子中测得的值一致，并且下降到高红移时从宇宙微波背景中测得的值。我们的结果可以缓解哈勃张力，并更喜欢它的晚期解决方案，尤其是新物理学。
The current discrepancy between the Hubble constant $H_0$ derived from the local distance ladder and from the cosmic microwave background is one of the most crucial issues in cosmology, as it possibly indicates unknown systematics or new physics. Here we present a novel non-parametric method to estimate Hubble constant as a function of redshift. We establish independent estimates of the evolution of Hubble constant by diagonalizing the covariance matrix. From type Ia supernovae and the observed Hubble parameter data, a decreasing trend of Hubble constant with a significance of 5.6$σ$ confidence level is found. At low redshift, its value is dramatically consistent with that measured from the local distance ladder, and it drops to the value measured from the cosmic microwave background at high redshift. Our results can relieve the Hubble tension, and prefer the late-time solutions of it, especially the new physics.
