First confirmation of anisotropic halo bias from statistically anisotropic matter distributions
Fuente:
arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
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| _version_ | 1866916738887581696 |
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| author | Masaki, Shogo Shiraishi, Maresuke Nishimichi, Takahiro Okumura, Teppei Yokoyama, Shuichiro |
| author_facet | Masaki, Shogo Shiraishi, Maresuke Nishimichi, Takahiro Okumura, Teppei Yokoyama, Shuichiro |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_12004 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | First confirmation of anisotropic halo bias from statistically anisotropic matter distributions Masaki, Shogo Shiraishi, Maresuke Nishimichi, Takahiro Okumura, Teppei Yokoyama, Shuichiro Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies 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. |
| title | First confirmation of anisotropic halo bias from statistically anisotropic matter distributions |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2409.12004 |