Analysis demonstrates significant alignment of halo orientations with statistical anisotropy in massive halos, suggesting new observational methods.
We investigate how statistical anisotropy (SA) in matter distributions affects the shapes and orientations of cluster-sized halos, using cosmological N-body simulations that incorporate SA. While the three-dimensional halo shape parameters show little dependence on SA, we find that halo orientations are significantly influenced, with halos tending to align either perpendicular or parallel to the SA direction. This SA-induced alignment becomes more prominent for more massive halos. Our findings suggest that observational measurements of projected halo shapes, such as those derived from galaxy cluster-galaxy lensing, could provide a novel probe of SA in the universe.
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Masaki et al. (2025) studied this question.
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