Diverse dark matter haloes in Two-field Fuzzy Dark Matter
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arXiv
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| Auteurs principaux: | , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866908414065508352 |
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| author | Luu, Hoang Nhan Mocz, Philip Vogelsberger, Mark Pozo, Alvaro Broadhurst, Tom Tye, S. -H. Henry Liu, Tao Fung, Leo W. H. Smoot, George F. Emami, Razieh Hernquist, Lars |
| author_facet | Luu, Hoang Nhan Mocz, Philip Vogelsberger, Mark Pozo, Alvaro Broadhurst, Tom Tye, S. -H. Henry Liu, Tao Fung, Leo W. H. Smoot, George F. Emami, Razieh Hernquist, Lars |
| contents | Fuzzy dark matter (FDM) is a compelling candidate for dark matter, offering a natural explanation for the structure of diffuse low-mass haloes. However, the canonical FDM model with a mass of $10^{-22}~{\rm eV}$ encounters challenges in reproducing the observed diversity of dwarf galaxies, except for possibly scenarios where strong galactic feedback is invoked. The introduction of multiple-field FDM can provide a potential resolution to this diversity issue. The theoretical plausibility of this dark matter model is also enhanced by the fact that multiple axion species with logarithmically-distributed mass spectrum exist as a generic prediction of string theory. In this paper, we consider the axiverse hypothesis and investigate non-linear structure formation in the two-field fuzzy dark matter (2FDM) model. Our cosmological simulation with an unprecedented resolution and self-consistent initial conditions reveals the diverse structures of dark matter haloes in the 2FDM model for the first time. Depending on the formation time and local tidal activities, late-time haloes can host solitons of nested cores or solitons of one dominant species. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_00827 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Diverse dark matter haloes in Two-field Fuzzy Dark Matter Luu, Hoang Nhan Mocz, Philip Vogelsberger, Mark Pozo, Alvaro Broadhurst, Tom Tye, S. -H. Henry Liu, Tao Fung, Leo W. H. Smoot, George F. Emami, Razieh Hernquist, Lars Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies Fuzzy dark matter (FDM) is a compelling candidate for dark matter, offering a natural explanation for the structure of diffuse low-mass haloes. However, the canonical FDM model with a mass of $10^{-22}~{\rm eV}$ encounters challenges in reproducing the observed diversity of dwarf galaxies, except for possibly scenarios where strong galactic feedback is invoked. The introduction of multiple-field FDM can provide a potential resolution to this diversity issue. The theoretical plausibility of this dark matter model is also enhanced by the fact that multiple axion species with logarithmically-distributed mass spectrum exist as a generic prediction of string theory. In this paper, we consider the axiverse hypothesis and investigate non-linear structure formation in the two-field fuzzy dark matter (2FDM) model. Our cosmological simulation with an unprecedented resolution and self-consistent initial conditions reveals the diverse structures of dark matter haloes in the 2FDM model for the first time. Depending on the formation time and local tidal activities, late-time haloes can host solitons of nested cores or solitons of one dominant species. |
| title | Diverse dark matter haloes in Two-field Fuzzy Dark Matter |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2408.00827 |