Speaker
Description
The cosmological principle asserts that the Universe is statistically isotropic on large scales, while alternative cosmological models can produce anisotropic signatures. Recent studies have suggested tantalising hints of anisotropies in supernova Ia, cosmic microwave background, and gamma-ray burst data, though these remain unconfirmed. We test for cosmological anisotropies using the latest LIGO-Virgo-KAGRA O4a catalog of events and the gamma-ray burst web compilation of gamma-ray bursts. If the cosmological principle holds, the sky localisation and characteristics of the gamma-ray bursts and gravitational waves (masses, luminosities, redshifts) should be statistically isotropic when corrected for selection biases. We analyze the sky distributions and source properties of these transients using angular power spectra, two-point correlation statistics, and Bayesian population tests, and compare the results with synthetic isotropic data. Our work extends previous analyses by incorporating the most recent datasets, the inclusion of other characteristics (e.g. masses) beyond sky positions and multiple complementary tests. We find no significant evidence for anisotropy in the current gravitational wave and gamma-ray burst datasets, consistent with the cosmological principle.
| Participate the oral/poster presentation award competition | Yes |
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