利用偏振漂移测量宇宙的均匀性
Measuring the Homogeneity of the Universe Using Polarization Drift
摘要：
我们提出了一种方法来探测一般宇宙的均匀性，而不假设对称性。我们表明，各向同性可以测试在过去的光锥上的远程位置通过比较的视线和横向膨胀率，使用的宇宙微波背景光子，已被逆康普顿散射的热气体在大规模星系团的偏振的时间依赖性。这探测了度规膨胀率的远距离横向分量和平行分量的组合，我们可以使用径向重子声学振荡或宇宙钟来测量平行膨胀率。因此，我们可以测试遥远的各向同性，这是均匀宇宙的关键要求。我们提供明确的公式，连接可观的度量和属性。
英文摘要：
We propose a method to probe the homogeneity of a general universe, without assuming symmetry. We show that isotropy can be tested at remote locations on the past lightcone by comparing the line-of-sight and transverse expansion rates, using the time dependence of the polarization of Cosmic Microwave Background photons that have been inverse-Compton scattered by the hot gas in massive clusters of galaxies. This probes a combination of remote transverse and parallel components of the expansion rate of the metric, and we may use radial baryon acoustic oscillations or cosmic clocks to measure the parallel expansion rate. Thus we can test remote isotropy, which is a key requirement of a homogeneous universe. We provide explicit formulas that connect observables and properties of the metric.
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