Constraints on Self-Interacting Fuzzy Dark Matter from the Stellar Kinematics of the Dwarf Galaxy Leo II
Fuente:
arXiv
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Preprint |
| Published: |
2026
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866913136363175936 |
|---|---|
| author | Zhao, Yi Yang, Yu-Ming Bi, Xiao-Jun Yin, Peng-Fei |
| author_facet | Zhao, Yi Yang, Yu-Ming Bi, Xiao-Jun Yin, Peng-Fei |
| contents | The one-parameter fuzzy dark matter (FDM) model has faced increasingly stringent constraints from both Lyman-$α$ forest observations and local measurements of dwarf galaxies. A natural extension to mitigate these limits is the inclusion of FDM self-interactions. In this study, we derive constraints in the two-dimensional parameter space $(m_a, f_a)$ using the dark matter density profile inferred from a Jeans analysis of the stellar kinematics in the dwarf galaxy Leo II, which has previously been employed to constrain non-interacting FDM. We find that, for a fixed particle mass $m_a$, attractive (repulsive) self-interaction leads to a more concentrated (more diffuse) FDM density profile relative to the non-interacting case, thereby improving (worsening) agreement with the Jeans analysis results. Our results indicate that, for either attractive or repulsive SI with strength $f_a^{-1}\lesssim 10^{-14}\,\mathrm{GeV}^{-1}$, the $95\%$ confidence-level lower limits on $m_a$ lies within the range $(1-10)\times10^{-22}\,\mathrm{eV}$, although the precise bounds depend to some extent on the statistical method employed. This analysis simultaneously constrains the two parameters $(m_a, f_a)$ without relying on assumptions about cosmological or galaxy evolution histories, and thus offers a complementary probe to existing constraints. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_17211 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Constraints on Self-Interacting Fuzzy Dark Matter from the Stellar Kinematics of the Dwarf Galaxy Leo II Zhao, Yi Yang, Yu-Ming Bi, Xiao-Jun Yin, Peng-Fei Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Physics - Phenomenology The one-parameter fuzzy dark matter (FDM) model has faced increasingly stringent constraints from both Lyman-$α$ forest observations and local measurements of dwarf galaxies. A natural extension to mitigate these limits is the inclusion of FDM self-interactions. In this study, we derive constraints in the two-dimensional parameter space $(m_a, f_a)$ using the dark matter density profile inferred from a Jeans analysis of the stellar kinematics in the dwarf galaxy Leo II, which has previously been employed to constrain non-interacting FDM. We find that, for a fixed particle mass $m_a$, attractive (repulsive) self-interaction leads to a more concentrated (more diffuse) FDM density profile relative to the non-interacting case, thereby improving (worsening) agreement with the Jeans analysis results. Our results indicate that, for either attractive or repulsive SI with strength $f_a^{-1}\lesssim 10^{-14}\,\mathrm{GeV}^{-1}$, the $95\%$ confidence-level lower limits on $m_a$ lies within the range $(1-10)\times10^{-22}\,\mathrm{eV}$, although the precise bounds depend to some extent on the statistical method employed. This analysis simultaneously constrains the two parameters $(m_a, f_a)$ without relying on assumptions about cosmological or galaxy evolution histories, and thus offers a complementary probe to existing constraints. |
| title | Constraints on Self-Interacting Fuzzy Dark Matter from the Stellar Kinematics of the Dwarf Galaxy Leo II |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2605.17211 |