Evolution of self-gravitating spherical dark-matter halos with and without new physics

2025/04/18 by Kamionkowski, Marc, Sigurdson, Kris R. · 3 citations
#70F10 #85-08 #85A05 #85A15 #85A40 #Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th)

paper · doi:10.48550/arxiv.2504.13996

Abstract

We present an efficient numerical algorithm for evolving self-gravitating systems of dark-matter particles that leverages the assumption of spherical symmetry to reduce the nominally six-dimensional phase space to three dimensions. It can be used to quickly determine numerically the evolution of an initially static stable self-consistent self-gravitating system if there is some additional or new physics. We illustrate here with four examples: (1) the effects of the growth of a supermassive black hole at the center; (2) the effects of stripping of the outer layers of the halo (a toy model for the effects of tidal stripping of galaxies); (3) the response of a self-gravitating system to dark matter that decays to a slightly less massive state; and (4) the effects of a slow change to Newton's constant. The approach can be extended to study dark matter with elastic and inelastic self-interactions and to study the process of virialization in spherical collapse. We describe some aspects of a code NSphere that implements this approach which we are making available.

Citations

• Rapid Methods for Modeling Overdensities of Massive Neutrinos and Other Non-Cold Relics
• Metamorphosis of dwarf halo density profile under dark matter decays
• Concentrations of Dark Haloes Emerge from Their Merger Histories
• Neutrino clustering in the Milky Way and beyond
• Accelerated core collapse in tidally stripped self-interacting dark matter halos
• Evaporating the Milky Way halo and its satellites with inelastic self-interacting dark matter
• Dark Matter Self-interactions and Small Scale Structure
• Cosmological Structure Formation in Decaying Dark Matter Models
• Big bang darkleosynthesis
• Cosmological Simulations of Decaying Dark Matter: Implications for Small-scale Structure of Dark Matter Halos
• MOCCA code for star cluster simulations - III. Stellar-mass black holes in the globular cluster M22
• Constraints on Decaying Dark Matter
• Neutrinos in non-linear structure formation — the effect on halo properties
• Mapping the allowed parameter space for decaying dark matter models
• The Galactic Center
• The Design and Implementation of FFTW3
• Gravitational clustering of relic neutrinos and implications for their detection
• Dark-matter spike at the galactic center?
• Inelastic Dark Matter
• Halo Properties in Cosmological Simulations of Self-Interacting Cold Dark Matter
• Monte-Carlo Simulations of Globular Cluster Evolution - I. Method and Test Calculations
• A Universal Density Profile from Hierarchical Clustering
• Models of Galaxies with Central Black Holes: Adiabatic Growth in Spherical Galaxies
• Regularization of kepler's problem and the averaging method on a manifold
• Mémoire sur le problème des trois corps

Cited by

• Gravothermal collapse of self-interacting dark-matter halos with anisotropic velocity distributions
• Self-Interacting Dark Matter with Mass Segregation: A Unified Explanation of Dwarf Cores and Small-Scale Lenses
• Numerical evolution of self-gravitating halos of self-interacting dark matter

Related

• Numerical evolution of self-gravitating halos of self-interacting dark matter
• The Formation and Evolution of Self-Interacting Dark Matter Halos
• To collapse or not to collapse: Halo evolution with self-interacting dark matter mass segregation
• On the Late-Time Evolution of Velocity-Dependent Self-Interacting Dark Matter Halos
• Numerical Challenges in Modeling Gravothermal Collapse in Self-Interacting Dark Matter Halos