Constraints on dark matter self-interaction from velocity distribution function in isolated halos

2025/05/15 by Tirtha Sankar Ray, Ray, Tirtha Sankar, Sambo Sarkar +1
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Scientific Research and Discoveries

paper · pdf · doi:10.48550/arxiv.2505.10451

openalex publication_date 2025/05/15 · openalex created_date 2025/10/15 · openalex updated_date 2026/07/28

Abstract

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 ≤ 2.7 \rm cm²/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.

Citations

• Stringent Constraints on Self-Interacting Dark Matter Using Milky-Way Satellite Galaxies Kinematics
• Heating the dark matter halo with dark radiation from supernovae
• The GD-1 stellar stream perturber as a core-collapsed self-interacting dark matter halo
• EDEN: Exploring Disks Embedded in N-body simulations of Milky-Way-mass halos from Symphony
• Gravothermal collapse and the diversity of galactic rotation curves
• Hydrodynamical simulations of merging galaxy clusters: giant dark matter particle colliders, powered by gravity
• Numerical Challenges in Modeling Gravothermal Collapse in Self-Interacting Dark Matter Halos
• Convergence Tests of Self-Interacting Dark Matter Simulations
• The dark matter profile of the Milky Way inferred from its circular velocity curve
• A Conceptual Introduction to Markov Chain Monte Carlo Methods
• SciPy 1.0: fundamental algorithms for scientific computing in Python
• Non-parametric application of Tsallis statistics to systems consisting of M hydrogen molecules
• Yet Another Introduction to Dark Matter
• The Galaxy in Context: Structural, Kinematic, and Integrated Properties
• Statistical mechanics of violent relaxation in stellar systems
• Dark matter, density perturbations and structure formation
• The Structure and Dynamics of Cold Dark Matter Halos
• Time stepping N-body simulations

Related

• Shallow cores in the dark matter halos: self-interaction in action?
• A quantitative comparison between velocity dependent SIDM cross sections constrained by the gravothermal and isothermal models
• Constraints on Dark Matter Self-Interactions from weak lensing of galaxies from the Dark Energy Survey around clusters from the Atacama Cosmology Telescope Survey
• Galactic halos of self-interacting dark matter
• Evolution of Resonant Self-interacting Dark Matter Halos