本地星系分布不违反宇宙学原理
The local galaxy distribution does not violate the cosmological principle
浏览论文内容
中文总结 AI 辅助
通过FLAMINGO宇宙学流体模拟与DESI DR1数据的对比，发现使用正确共动距离尺度后，本地星系分布的各向异性特征消失，与ΛCDM模型一致。
中文摘要 AI 辅助
宇宙学原理认为宇宙在足够大的尺度上是统计均匀且各向同性的，这是标准宇宙学模型的基础假设。最近对DESI DR1星系样本的分析报告称，本地星系分布中存在延伸到千兆秒差距尺度的相干各向异性特征。如果正确，这一结果将直接与宇宙学原理相矛盾，并激发非均匀宇宙学。本文分析了相同的数据，并将其与在标准ΛCDM范式下进行的FLAMINGO宇宙学流体模拟预测的星系分布进行比较。结果表明，当使用正确的共动距离尺度时，明显的异常消失。本文还表明，观测到的结构并非违反宇宙学原理，而是与ΛCDM宇宙中预期的结构一致。
英文摘要
The cosmological principle, which states that the Universe is statistically homogeneous and isotropic on sufficiently large scales, is a foundational assumption of the standard cosmological model. A recent analysis of DESI DR1 galaxy samples reported coherent anisotropic features in the local galaxy distribution extending to gigaparsec scales. If correct, this result would directly contradict the cosmological principle and motivate inhomogeneous cosmologies. Here I analyze the same data and compare them with galaxy distributions predicted by the FLAMINGO cosmological hydrodynamic simulation, performed in the standard $Λ$CDM paradigm. I show that the apparent anomaly disappears when the correct comoving distance scale is used and when the observations are compared to mock catalogs that account for bias and redshift-space distortions. Rather than violating the cosmological principle, the observed structures are consistent with those expected in a $Λ$CDM Universe.
