Testing the parametric model for self-interacting dark matter using matched halos in cosmological simulations

Abstract

We systemically evaluate the performance of the self-interacting dark matter (SIDM) halo model proposed in arXiv:2305.16176 with matched halos from high-resolution cosmological CDM and SIDM simulations. The model incorporates SIDM effects along mass evolution histories of CDM halos and it is applicable to both isolated halos and suhbhalos. We focus on the accuracy of the model in predicting halo density profiles at $z=0$ and the evolution of maximum circular velocity. We find the model predictions agree with the simulations within $10\%-50\%$ for most of the simulated (sub)halos, $50\%-100\%$ for extreme cases. This indicates that the model effectively captures the gravothermal evolution of the halos with very strong, velocity-dependent self-interactions. For an example application, we apply the model to study the impact of various SIDM scenarios on strong lensing perturber systems, demonstrating its utility in predicting SIDM effects for small-scale structure analyses. Our findings confirm that the model is an effective tool for mapping CDM halos into their SIDM counterparts.

21 pages, 19 figures. Published in Phys. Dark Universe

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• Supermassive Black Holes from Ultra-Strongly Self-Interacting Dark Matter
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Cited by in corpus (9)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Gravothermal collapse and the diversity of galactic rotation curves
• SIDM Concerto: Compilation and Data Release of Self-interacting Dark Matter Zoom-in Simulations
• SASHIMI-SIDM: Semi-analytical subhalo modelling for self-interacting dark matter at sub-galactic scales
• COZMIC. III. Cosmological Zoom-in Simulations of Self-interacting Dark Matter with Suppressed Initial Conditions
• Diversifying halo structures in two-component self-interacting dark matter models via mass segregation
• A Universal Analytic Model for Gravitational Lensing by Self-Interacting Dark Matter Halos
• A dense dark matter core of the subhalo in the strong lensing system JVAS B1938+666
• Self-Interacting Dark Matter with Mass Segregation: A Unified Explanation of Dwarf Cores and Small-Scale Lenses