2024/09/18 by Shogo Masaki, Masaki, Shogo, Maresuke Shiraishi +7 · 1 citation
Computer Science · Mathematics · Social Sciences · #Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Geochemistry and Geologic Mapping #Insurance, Mortality, Demography, Risk Management #Statistical and numerical algorithms
paper · pdf · doi:10.48550/arxiv.2409.12004
openalex publication_date 2024/09/18 · openalex created_date 2024/10/25 · openalex updated_date 2026/07/28
We confirm for the first time the existence of distinctive halo bias associated with the quadrupolar type of statistical anisotropy (SA) of the linear matter density field using cosmological N-body simulations. We find that the coefficient of the SA-induced bias for cluster-sized halos takes negative values and exhibits a decreasing trend with increasing halo mass. This results in the quadrupole halo power spectra in a statistically anisotropic universe being less amplified compared to the monopole spectra. The anisotropic feature in halo bias that we found presents a promising new tool for testing the hypothesis of a statistically anisotropic universe, with significant implications for the precise verification of anisotropic inflation scenarios and vector dark matter and dark energy models.