Gravothermal evolution of dark matter halos with differential elastic scattering

Abstract

We study gravothermal evolution of dark matter halos in the presence of differential self-scattering that has strong velocity and angular dependencies. We design controlled N-body simulations to model Rutherford and Moller scatterings in the halo, and follow its evolution in both core-expansion and -collapse phases. The simulations show the commonly-used transfer cross section underestimates the effects of dark matter self-interactions, but the viscosity cross section provides an accurate approximation for modeling angular-dependent dark matter scattering. We investigate thermodynamic properties of the halo, and find that the three moments of the Boltzmann equation under the fluid approximation are satisfied. We further propose a constant effective cross section, which integrates over the halo's characteristic velocity dispersion with weighting kernels motivated by kinetic theory of heat conduction. The effective cross section provides a good approximation to differential self-scattering for most of the halo evolution. It indicates that we can map astrophysical constraints on a constant self-interacting cross section to an SIDM model with velocity- and angular-dependent scatterings.

26 pages, 12 figures; results updated with high-resolution simulations; a minor error corrected; main conclusions unchanged

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Cited by in corpus (42)

• A Self-interacting Dark Matter Solution to the Extreme Diversity of Low-mass Halo Properties
• Gravothermal solutions of SIDM halos: mapping from constant to velocity-dependent cross section
• Strong Dark Matter Self-interactions Diversify Halo Populations within and surrounding the Milky Way
• The impact of baryonic potentials on the gravothermal evolution of self-interacting dark matter haloes
• A Parametric Model for Self-Interacting Dark Matter Halos
• Exploring the nature of dark matter with the extreme galaxy AGC 114905
• Dianoga SIDM: galaxy cluster self-interacting dark matter simulations
• Cosmological and idealized simulations of dark matter haloes with velocity-dependent, rare and frequent self-interactions
• Self-interacting dark matter interpretation of Crater II
• Numerical Challenges in Modeling Gravothermal Collapse in Self-Interacting Dark Matter Halos
• The role of baryons in self-interacting dark matter mergers
• Numerical challenges for energy conservation in N-body simulations of collapsing self-interacting dark matter halos
• Self-Interacting Dark Matter, Core Collapse and the Galaxy-Galaxy Strong Lensing Discrepancy
• Gravothermal collapse and the diversity of galactic rotation curves
• Formation of the Little Red Dots from the Core-collapse of Self-interacting Dark Matter Halos
• Dynamical friction from self-interacting dark matter
• Testing the parametric model for self-interacting dark matter using matched halos in cosmological simulations
• Discriminating power of milli-lensing observations for dark matter models
• Fitting a Self-Interacting Dark Matter Model to Data Ranging From Satellite Galaxies to Galaxy Clusters
• SIDM Concerto: Compilation and Data Release of Self-interacting Dark Matter Zoom-in Simulations
• Searching Accretion-Enhanced Dark Matter Annihilation Signals in the Galactic Centre
• SASHIMI-SIDM: Semi-analytical subhalo modelling for self-interacting dark matter at sub-galactic scales
• Simulations of galaxy cluster mergers with velocity-dependent, rare and frequent self-interactions
• Exploring Self-Interacting Dark Matter Halos with Diverse Baryonic Distributions: A Parametric Approach
• Gravothermal Catastrophe in Resonant Self-interacting Dark Matter Models
• Anisotropic strong lensing as a probe of dark matter self-interactions
• Relaxing Constraints on Dark Matter Annihilation Near the Supermassive Black Hole in M87
• COZMIC. III. Cosmological Zoom-in Simulations of Self-interacting Dark Matter with Suppressed Initial Conditions
• A Universal Analytic Model for Gravitational Lensing by Self-Interacting Dark Matter Halos
• N-body simulations of dark matter-baryon interactions
• Diversifying halo structures in two-component self-interacting dark matter models via mass segregation
• Simulating realistic self-interacting dark matter models including small and large-angle scattering
• Core Collapse Beyond the Fluid Approximation: The Late Evolution of Self-Interacting Dark Matter Halos
• DARKSKIES: A suite of super-sampled zoom-in simulations of galaxy clusters with self-interacting dark matter
• New Cold Dark Matter Crisis Revealed by Multiscale Cluster Lensing
• The "Little Dark Dot": Evidence for Self-interacting Dark Matter in the Strong Lens SDSS J0946+1006?
• Constraints on dark matter models from the stellar cores observed in ultra-faint dwarf galaxies: Self-interacting dark matter
• Core collapse in resonant self-interacting dark matter across two decades in halo mass
• Dark-Matter-Deficient Galaxies from Collisions: A New Probe of Bursty Feedback and Dark Matter Physics
• An Enhanced Isothermal Jeans Approach to Constraining Dark Matter Self-Interactions from Galactic Kinematics
• Role of prompt cusps in driving the core collapse of SIDM halos
• Accretion of self-interacting dark matter onto supermassive black holes