On the maximum disk heating attributable to fuzzy dark matter
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arXiv
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866915069341728768 |
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| author | Hamilton, Chris |
| author_facet | Hamilton, Chris |
| contents | Fuzzy dark matter (FDM) granulations would drive orbital transport of stars in galactic disks, and in particular would produce roughly equal amounts of radial heating and radial migration. However, observations suggest that heating has been much less efficient than migration in our Galaxy. We argue that this decreases the amount of radial heating, $\mathcal{H}_\mathrm{FDM}$, that can safely be attributed to FDM. Consequently, lower bounds on the FDM particle mass $m$ derived through Galactic disk kinematics should be revised upwards; a rough estimate is $m \gtrsim 1.3\times 10^{-22} \mathrm{eV} \times [(\mathcal{H}_\mathrm{FDM}/\mathcal{H})/0.1]^{-1/2}$, where $\mathcal{H}$ is the total observed radial heating. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_13275 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On the maximum disk heating attributable to fuzzy dark matter Hamilton, Chris Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics Fuzzy dark matter (FDM) granulations would drive orbital transport of stars in galactic disks, and in particular would produce roughly equal amounts of radial heating and radial migration. However, observations suggest that heating has been much less efficient than migration in our Galaxy. We argue that this decreases the amount of radial heating, $\mathcal{H}_\mathrm{FDM}$, that can safely be attributed to FDM. Consequently, lower bounds on the FDM particle mass $m$ derived through Galactic disk kinematics should be revised upwards; a rough estimate is $m \gtrsim 1.3\times 10^{-22} \mathrm{eV} \times [(\mathcal{H}_\mathrm{FDM}/\mathcal{H})/0.1]^{-1/2}$, where $\mathcal{H}$ is the total observed radial heating. |
| title | On the maximum disk heating attributable to fuzzy dark matter |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2412.13275 |