发表机构
Huazhong University of Science and Technology（华中科技大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究利用CHIME/FRB目录中的536个FRB，通过两点角相关函数和西格玛图方法测试宇宙各向同性，校正观测偏差。虽结果与各向同性预期相符，但受样本量限制，2PACF有协方差矩阵问题，西格玛图低多极不确定性大，期待未来FRB调查改进。
AI 中文摘要
我们使用来自首个CHIME/FRB目录的536个快速射电暴（FRB）来测试宇宙的各向同性，采用两种互补统计方法：两点角相关函数（2PACF）和西格玛图方法，并利用CHIME注入数据校正观测偏差。两种分析均与各向同性预期一致，但受小样本量限制。2PACF存在协方差矩阵病态问题，妨碍稳健参数推断。西格玛图角功率谱未显示出统计上显著的方向各向异性，不过低多极处的不确定性仍然很大。未来的FRB调查有望改善这些限制。
英文摘要
We test the isotropy of the Universe using 536 Fast Radio Bursts (FRBs) from the first CHIME/FRB catalog, employing two complementary statistical methods: the two-point angular correlation function (2PACF) and the sigma-map method, with observational biases corrected using CHIME injection data. Both analyses are consistent with the isotropic expectation, but are limited by the small sample size. The 2PACF suffers from an ill-conditioned covariance matrix, preventing robust parameter inference. The sigma-map angular power spectrum shows no statistically significant directional anisotropy, though the uncertainties at low multipoles remain large. Future FRB surveys are expected to improve these limitations.
Comments14 pages, 3 figures, submitted to PRD
