论文标题
在扰动的宇宙中建造光滑的宇宙距离梯子的艺术
The art of building a smooth cosmic distance ladder in a perturbed universe
论文作者
论文摘要
光滑的宇宙距离梯子如何从块状宇宙中的一个位置进行的观察结果中出现？ Hubble流中IA型超新星类型的距离固定在局部距离测量上，直到附近的来源。我们描述了如何在扰动的宇宙中构建这种配置，其中块状被描述为在Friedmann-LemaıtreRobertson-Walker SpaceTime之上的小扰动。我们表明，由于观察者的直接社区中存在不均匀性，因此对背景弗里德曼·莱玛特·罗伯逊 - 步行者区域距离有不可忽略的修改（约11 \％）。我们发现修饰是由Weyl张量的电部分来源的，表明观察者的局部时空发生了潮汐变形。我们详细说明了它如何影响哈勃流中IA型超新星绝对幅度的校准。我们表明，它可以同时解决IA型超新星绝对幅度和哈勃张力，而无需早期或晚些黑能。
How does a smooth cosmic distance ladder emerge from observations made from a single location in a lumpy Universe? Distances to Type Ia supernovae in the Hubble flow are anchored on local distance measurements to sources that are very nearby. We described how this configuration could be built in a perturbed universe where lumpiness is described as small perturbations on top of a flat Friedmann-Lemaıtre Robertson-Walker spacetime. We show that there is a non-negligible modification (about 11\%) to the background Friedmann-Lemaıtre Robertson-Walker area distance due to the presence of inhomogeneities in the immediate neighbourhood of an observer. We find that the modification is sourced by the electric part of the Weyl tensor indicating a tidal deformation of the local spacetime of the observer. We show in detail how it could impact the calibration of the Type Ia supernova absolute magnitude in the Hubble flow. We show that it could potentially resolve the Type Ia supernova absolute magnitude and Hubble tensions simultaneously without the need for early or late dark energy.
