A Parametric Model for Self-Interacting Dark Matter Halos

Abstract

We propose a parametric model for studying self-interacting dark matter (SIDM) halos. The model uses an analytical density profile, calibrated using a controlled N-body SIDM simulation that covers the entire gravothermal evolution, including core-forming and -collapsing phases. By normalizing the calibrated density profile, we obtain a universal description for SIDM halos at any evolution phase. The model allows us to infer properties of SIDM halos based on their cold dark matter (CDM) counterparts. As a basic application, we only require two characteristic parameters of an isolated CDM halo at $z=0$. We then extend the model to incorporate effects induced by halo mass changes, such as major mergers or tidal stripping, making it applicable to both isolated halos and subhalos. The parametric model is tested and validated using cosmological zoom-in SIDM simulations available in the literature.

arXiv comment22 pages, 14 figures, typos fixed, added example rotation curves and an appendix for the model based on the CORE-NFW ("Read") profile; example scripts provided through a link

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Cited by in corpus (20)

• Exploring the nature of dark matter with the extreme galaxy AGC 114905
• Self-interacting dark matter interpretation of Crater II
• Numerical Challenges in Modeling Gravothermal Collapse in Self-Interacting Dark Matter Halos
• Gravothermal collapse and the diversity of galactic rotation curves
• SIDM Concerto: Compilation and Data Release of Self-interacting Dark Matter Zoom-in Simulations
• Exploring Self-Interacting Dark Matter Halos with Diverse Baryonic Distributions: A Parametric Approach
• SASHIMI-SIDM: Semi-analytical subhalo modelling for self-interacting dark matter at sub-galactic scales
• Gravothermal Catastrophe in Resonant Self-interacting Dark Matter Models
• A possible challenge for Cold and Warm Dark Matter
• COZMIC. III. Cosmological Zoom-in Simulations of Self-interacting Dark Matter with Suppressed Initial Conditions
• Relaxing Constraints on Dark Matter Annihilation Near the Supermassive Black Hole in M87
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• Diversifying halo structures in two-component self-interacting dark matter models via mass segregation
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• Role of prompt cusps in driving the core collapse of SIDM halos