TL;DR
This study uses Bayesian analysis to investigate galaxy spin directions in the Hyper Suprime-Cam data, finding no significant anisotropy and supporting an isotropic universe model.
Contribution
It introduces a Bayesian approach to test galaxy spin anisotropy, providing a more rigorous analysis than previous methods.
Findings
No significant evidence for anisotropy in galaxy spins.
Bayes factor strongly supports the isotropic model.
Results remain consistent under various anisotropy assumptions.
Abstract
We perform a Bayesian analysis of anisotropy in binary galaxy spin directions in the Hyper-Suprime Cam Data Release 3 catalogue, in response to a recent claim that it exhibits a dipole (Shamir 2024). We find no significant evidence for anisotropy, or for a direction-independent spin probability that differs from 0.5. These results are unchanged allowing for a quadrupole or simply searching for a fixed anisotropy between any two hemispheres, and the Bayes factor indicates decisive evidence for the isotropic model. Our principled method contrasts with the statistic employed by Shamir 2024, which lacks a strong theoretical foundation.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Code & Models
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
