Paper
Testing the isothermal Jeans model for self-interacting dark matter halos in the collapse phase
Authors
Shubo Li, Moritz S. Fischer, Zixiang Jia, Fangzhou Jiang, Ran Li, Hai-Bo Yu
Abstract
We benchmark the semi-analytical isothermal Jeans model against a high-resolution isolated N-body simulation that follows a self-interacting dark matter (SIDM) halo into deep core collapse. The model accurately reproduces the density evolution through much of the collapse phase, although it does not capture the sharp rise in central velocity dispersion during collapse. When applied to strong gravitational lensing observables, such as the projected mass and logarithmic density slope of SIDM halos, the Jeans model tracks the simulated evolution more closely than the parametric approach in the deep collapse regime. Our results demonstrate that the isothermal Jeans model provides a reliable and computationally efficient description of SIDM halo evolution.
Metadata
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Raw Data (Debug)
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"raw_xml": "<entry>\n <id>http://arxiv.org/abs/2603.01772v1</id>\n <title>Testing the isothermal Jeans model for self-interacting dark matter halos in the collapse phase</title>\n <updated>2026-03-02T11:55:45Z</updated>\n <link href='https://arxiv.org/abs/2603.01772v1' rel='alternate' type='text/html'/>\n <link href='https://arxiv.org/pdf/2603.01772v1' rel='related' title='pdf' type='application/pdf'/>\n <summary>We benchmark the semi-analytical isothermal Jeans model against a high-resolution isolated N-body simulation that follows a self-interacting dark matter (SIDM) halo into deep core collapse. The model accurately reproduces the density evolution through much of the collapse phase, although it does not capture the sharp rise in central velocity dispersion during collapse. When applied to strong gravitational lensing observables, such as the projected mass and logarithmic density slope of SIDM halos, the Jeans model tracks the simulated evolution more closely than the parametric approach in the deep collapse regime. Our results demonstrate that the isothermal Jeans model provides a reliable and computationally efficient description of SIDM halo evolution.</summary>\n <category scheme='http://arxiv.org/schemas/atom' term='astro-ph.CO'/>\n <category scheme='http://arxiv.org/schemas/atom' term='astro-ph.GA'/>\n <published>2026-03-02T11:55:45Z</published>\n <arxiv:comment>12 pages, 6 figures</arxiv:comment>\n <arxiv:primary_category term='astro-ph.CO'/>\n <author>\n <name>Shubo Li</name>\n </author>\n <author>\n <name>Moritz S. Fischer</name>\n </author>\n <author>\n <name>Zixiang Jia</name>\n </author>\n <author>\n <name>Fangzhou Jiang</name>\n </author>\n <author>\n <name>Ran Li</name>\n </author>\n <author>\n <name>Hai-Bo Yu</name>\n </author>\n </entry>"
}