Testing cosmological isotropy with gravitational waves and gamma-ray bursts
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| author | Cheng, Brian H. Y. Cruz, Donniel C. Hannuksela, Otto A. Hassan, Davendra S. Heiderijk, Christian Hu, Leo Q. Jana, Souvik Kim, Jinwon Kong, Albert K. H. Lai, Peony K. K. Lange, Samuel C. Leong, Samson H. W. Lulli, Matteo Ma, Li-Ting Martens, Paul Ng, Boris H-L. Ng, Thomas C. K. Saha, Surojit Seong, Gwangeon Xian, Helen Zheng, Yanyan |
| author_facet | Cheng, Brian H. Y. Cruz, Donniel C. Hannuksela, Otto A. Hassan, Davendra S. Heiderijk, Christian Hu, Leo Q. Jana, Souvik Kim, Jinwon Kong, Albert K. H. Lai, Peony K. K. Lange, Samuel C. Leong, Samson H. W. Lulli, Matteo Ma, Li-Ting Martens, Paul Ng, Boris H-L. Ng, Thomas C. K. Saha, Surojit Seong, Gwangeon Xian, Helen Zheng, Yanyan |
| contents | The cosmological principle asserts that the Universe is homogeneous and isotropic on large enough scales. However, alternative cosmological models can bring about anisotropies through local inhomogeneities, anisotropic evolution, or exotic physics. In addition, select studies have also hinted at mild evidence of anisotropies in SNe Ia, CMB, and GRB data, though these remain unconfirmed. In this work, we test for cosmological anisotropies using gravitational waves and gamma-ray bursts, adopting the latest O4a release from the LIGO-Virgo-KAGRA collaboration and GRBWeb (including all known GRBs since 1991). If the cosmological principle holds, the sky localisation and the characteristics of the GRBs and GWs (masses, luminosities, redshifts) should be statistically isotropic when corrected for selection biases. We employ a couple statistical methods, including angular power spectra and two-point correlation functions, and compare the results against synthetic data. The work extends previous analyses by including the most recent datasets, and the use of multiple complementary statistical tests. We find no significant evidence for anisotropy in the current GW and GRB datasets, consistent with the cosmological principle. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_17746 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Testing cosmological isotropy with gravitational waves and gamma-ray bursts Cheng, Brian H. Y. Cruz, Donniel C. Hannuksela, Otto A. Hassan, Davendra S. Heiderijk, Christian Hu, Leo Q. Jana, Souvik Kim, Jinwon Kong, Albert K. H. Lai, Peony K. K. Lange, Samuel C. Leong, Samson H. W. Lulli, Matteo Ma, Li-Ting Martens, Paul Ng, Boris H-L. Ng, Thomas C. K. Saha, Surojit Seong, Gwangeon Xian, Helen Zheng, Yanyan Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology The cosmological principle asserts that the Universe is homogeneous and isotropic on large enough scales. However, alternative cosmological models can bring about anisotropies through local inhomogeneities, anisotropic evolution, or exotic physics. In addition, select studies have also hinted at mild evidence of anisotropies in SNe Ia, CMB, and GRB data, though these remain unconfirmed. In this work, we test for cosmological anisotropies using gravitational waves and gamma-ray bursts, adopting the latest O4a release from the LIGO-Virgo-KAGRA collaboration and GRBWeb (including all known GRBs since 1991). If the cosmological principle holds, the sky localisation and the characteristics of the GRBs and GWs (masses, luminosities, redshifts) should be statistically isotropic when corrected for selection biases. We employ a couple statistical methods, including angular power spectra and two-point correlation functions, and compare the results against synthetic data. The work extends previous analyses by including the most recent datasets, and the use of multiple complementary statistical tests. We find no significant evidence for anisotropy in the current GW and GRB datasets, consistent with the cosmological principle. |
| title | Testing cosmological isotropy with gravitational waves and gamma-ray bursts |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2604.17746 |