Constraints on dark matter self-interaction from velocity distribution function in isolated halos
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866910946423734272 |
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| author | Ray, Tirtha Sankar Sarkar, Sambo |
| author_facet | Ray, Tirtha Sankar Sarkar, Sambo |
| contents | Self-interactions facilitate inter-particle redistribution of energy within the dense regions of galactic halos, implying modifications in the density and velocity distribution of dark matter. Simulating dark-matter only isolated halos for a wide range of mass and specific self-scattering cross-sections, we make a systematic study of the impact of self-scattering on the velocity distribution profiles. We report a conservative bound on $σ/m$ $\leq 2.7 \rm cm^2/gm$ at $95\%$ C.L. from observations of rotation curves in Milky-Way size galaxies. Sub-leading bounds from LSB galaxy and clusters are also presented. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_10451 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Constraints on dark matter self-interaction from velocity distribution function in isolated halos Ray, Tirtha Sankar Sarkar, Sambo High Energy Physics - Phenomenology Astrophysics of Galaxies Self-interactions facilitate inter-particle redistribution of energy within the dense regions of galactic halos, implying modifications in the density and velocity distribution of dark matter. Simulating dark-matter only isolated halos for a wide range of mass and specific self-scattering cross-sections, we make a systematic study of the impact of self-scattering on the velocity distribution profiles. We report a conservative bound on $σ/m$ $\leq 2.7 \rm cm^2/gm$ at $95\%$ C.L. from observations of rotation curves in Milky-Way size galaxies. Sub-leading bounds from LSB galaxy and clusters are also presented. |
| title | Constraints on dark matter self-interaction from velocity distribution function in isolated halos |
| topic | High Energy Physics - Phenomenology Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2505.10451 |