作为均匀宇宙证据的各向同性黑体CMB
The isotropic blackbody CMB as evidence for a homogeneous universe
摘要：
宇宙在最大尺度上是否是空间均匀和各向同性的问题对宇宙学来说是至关重要的，但尚未得到明确的回答。令人惊讶的是，无论是各向同性的主CMB还是光度距离和星系数计数的组合观测都不足以建立这样的结果。然而，在CMB观测中纳入Sunyaev-Zel'dovich效应，极大地改善了这种情况。我们表明，即使是一个孤独的观察者谁看到一个各向同性的黑体CMB可以得出结论，宇宙是均匀的，各向同性的因果过去时，Sunyaev-Zel'dovich效应存在。然而，至关重要的是，CMB必须被观察很长一段时间，或者必须检测到散射超过一次的CMB光子。这一结果为仅用宇宙微波背景辐射的观测来检验宇宙学原理提供了理论基础。
英文摘要：
The question of whether the Universe is spatially homogeneous and isotropic on the largest scales is of fundamental importance to cosmology, but has not yet been answered decisively. Surprisingly, neither an isotropic primary CMB nor combined observations of luminosity distances and galaxy number counts are sufficient to establish such a result. The inclusion of the Sunyaev-Zel'dovich effect in CMB observations, however, dramatically improves this situation. We show that even a solitary observer who sees an isotropic blackbody CMB can conclude that the universe is homogeneous and isotropic in their causal past when the Sunyaev-Zel'dovich effect is present. Critically, however, the CMB must either be viewed for an extended period of time, or CMB photons that have scattered more than once must be detected. This result provides a theoretical underpinning for testing the Cosmological Principle with observations of the CMB alone.
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