Nested solitons in two-field fuzzy dark matter
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866911768135073792 |
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| author | Luu, Hoang Nhan Mocz, Philip Vogelsberger, Mark May, Simon Borrow, Josh Tye, S. -H. Henry Broadhurst, Tom |
| author_facet | Luu, Hoang Nhan Mocz, Philip Vogelsberger, Mark May, Simon Borrow, Josh Tye, S. -H. Henry Broadhurst, Tom |
| contents | Dark matter as scalar particles consisting of multiple species is well motivated in string theory where axion fields are ubiquitous. A two-field fuzzy dark matter (FDM) model features two species of ultralight axion particles with different masses, $m_1 \neq m_2$, which is extended from the standard one-field model with $m_a \sim 10^{-22}\,{\rm eV}$. Here we perform numerical simulations to explore the properties of two-field FDM haloes. We find that the central soliton has a nested structure when $m_2 \gg m_1$, which is distinguishable from the generic flat-core soliton in one-field haloes. However, the formation of this nested soliton is subject to many factors, including the density fraction and mass ratio of the two fields. Finally, we study non-linear structure formation in two-field cosmological simulations with self-consistent initial conditions and find that the small-scale structure in two-field cosmology is also distinct from the one-field model in terms of DM halo counts and soliton formation time. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_05694 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Nested solitons in two-field fuzzy dark matter Luu, Hoang Nhan Mocz, Philip Vogelsberger, Mark May, Simon Borrow, Josh Tye, S. -H. Henry Broadhurst, Tom Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies Dark matter as scalar particles consisting of multiple species is well motivated in string theory where axion fields are ubiquitous. A two-field fuzzy dark matter (FDM) model features two species of ultralight axion particles with different masses, $m_1 \neq m_2$, which is extended from the standard one-field model with $m_a \sim 10^{-22}\,{\rm eV}$. Here we perform numerical simulations to explore the properties of two-field FDM haloes. We find that the central soliton has a nested structure when $m_2 \gg m_1$, which is distinguishable from the generic flat-core soliton in one-field haloes. However, the formation of this nested soliton is subject to many factors, including the density fraction and mass ratio of the two fields. Finally, we study non-linear structure formation in two-field cosmological simulations with self-consistent initial conditions and find that the small-scale structure in two-field cosmology is also distinct from the one-field model in terms of DM halo counts and soliton formation time. |
| title | Nested solitons in two-field fuzzy dark matter |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2309.05694 |