Testing the Isothermal Jeans Model for Self-interacting Dark Matter Halos in the Collapse Phase
6 affiliations
- 1Beijing Normal University
- 2Chinese Academy of Sciences
- 3University of Chinese Academy of Sciences
- 4Donostia International Physics Center (DIPC)
- 5Peking University
- 6University of California
Abstract
We benchmark the semianalytical 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.
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BibTeX
@article{li2026testing,
title = {{Testing the Isothermal Jeans Model for Self-interacting Dark Matter Halos in the Collapse Phase}},
author = {Shubo Li and Moritz S. Fischer and Zixiang Jia and Fangzhou Jiang and Ran Li and Hai-Bo Yu},
journal = {The Astrophysical Journal},
year = {2026},
month = oct,
doi = {10.3847/1538-4357/aea78a},
url = {https://iopscience.iop.org/article/10.3847/1538-4357/aea78a},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Testing the Isothermal Jeans Model for Self-interacting Dark Matter Halos in the Collapse Phase
AU - Shubo Li
AU - Moritz S. Fischer
AU - Zixiang Jia
AU - Fangzhou Jiang
AU - Ran Li
AU - Hai-Bo Yu
PY - 2026
DA - 2026/10/16
JO - The Astrophysical Journal
DO - 10.3847/1538-4357/aea78a
UR - https://iopscience.iop.org/article/10.3847/1538-4357/aea78a
AB - We benchmark the semianalytical 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.
SN - 0004-637X
SN - 1538-4357
ER -