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PreprintCC BY 4.0arXiv

Testing the Isotropy of the Universe with the CHIME/FRB Catalog I

  • Jun-Yi Shen
  • Yuan-Chuan Zou
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Abstract

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.

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Cite

BibTeXRIS
BibTeX
@misc{shen2026testing,
  title = {{Testing the Isotropy of the Universe with the CHIME/FRB Catalog I}},
  author = {Jun-Yi Shen and Yuan-Chuan Zou},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2607.14982},
  eprint = {2607.14982},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.14982},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Testing the Isotropy of the Universe with the CHIME/FRB Catalog I
AU  - Jun-Yi Shen
AU  - Yuan-Chuan Zou
PY  - 2026
DA  - 2026/09/16
PB  - arXiv
DO  - 10.48550/arxiv.2607.14982
UR  - https://arxiv.org/abs/2607.14982
AB  - 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.
ER  -