First confirmation of anisotropic halo bias from statistically anisotropic matter distributions

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.

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Publication Details

Journal
Physical review. D/Physical review. D.
Published
2025-05-27
DOI
https://doi.org/10.1103/physrevd.111.l101301
Citations
2
Primary Topic
Cosmology and Gravitation Theories
Type
article
Field-Weighted Citation Impact
2.31

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article

First confirmation of anisotropic halo bias from statistically anisotropic matter distributions

Shuichiro Yokoyama, Maresuke Shiraishi, Shogo Masaki, Teppei Okumura et al.
2 citations
Physical review. D/Physical review. D.
Cosmology and Gravitation Theories
2.31
article

First confirmation of anisotropic halo bias from statistically anisotropic matter distributions

Shuichiro Yokoyama, Maresuke Shiraishi, Shogo Masaki, Teppei Okumura, Takahiro Nishimichi
article en
2 citations

Abstract

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.

Physical review. D/Physical review. D.Vol. 111(10)
Obayashi (Japan) (JP), Institute of Astronomy and Astrophysics, Academia Sinica (TW), Kavli Institute for the Physics and Mathematics of the Universe (JP), Kyoto Sangyo University (JP), Kyoto University (JP), Instituto de Física Teórica (ES), Suwa Red Cross Hospital (JP), Yukawa Institute for Theoretical Physics (JP), Nagoya University (JP), The University of Tokyo (JP), Chukyo University (JP)
Academia Sinica, Ministry of Science and Technology, Taiwan, National Astronomical Observatory of Japan, Japan Society for the Promotion of Science
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Openalex Percentile: Top 12%
Cosmology and Gravitation Theories
2.31
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First confirmation of anisotropic halo bias from statistically anisotropic matter distributions — Shuichiro Yokoyama, Maresuke Shiraishi, et al. · Physical review. D/Physical review. D. (2025) | TGRS Research Map | TGRS