The Failure of Self-Interacting Dark Matter to solve the Overabundance of Dark Satellites and the Soft Core Question

Abstract

Self-interacting dark matter was proposed by Spergel & Steinhardt (2000) to alleviate two conflicts between Cold Dark Matter (CDM) models and observations. Firstly, CDM N-body simulations predict dark matter halo density profiles that diverge at the centre in disagreement with the constant density cores observed in late-type dwarf and Low Surface Brightness (LSB) galaxies. Secondly, N-body simulations predict an overabundance of subhalos in the Galactic halo. Using a simple semi-analytical argument we show that weakly self-interacting dark matter models, which can produce halo cores of the sizes observed in dark matter dominated galaxies, are unable to reconcile the number of satellites in the Galactic halo with the observed number of dwarf galaxies in the Local Group.

10 pages, 3 figures. Accepted for Publication in ApJ with minor changes required

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Cited by in corpus (16)

• Dark Matter Self-interactions and Small Scale Structure
• Cosmological Simulations with Self-Interacting Dark Matter I: Constant Density Cores and Substructure
• Subhaloes in Self-Interacting Galactic Dark Matter Haloes
• Gravothermal collapse of isolated self-interacting dark matter haloes: N-body simulation versus the fluid model
• All about baryons: revisiting SIDM predictions at small halo masses
• Star Formation and the ISM in Four Dwarf Irregular Galaxies
• Signatures of Velocity-Dependent Dark Matter Self-Interactions in Milky Way-mass Halos
• About the morphology of dwarf spheroidal galaxies and their dark matter content
• Motivations for a Large Self-Interacting Dark Matter Cross Section from Milky Way Satellites
• Unstable Cold Dark Matter and the Cuspy Halo Problem in Dwarf Galaxies
• Dark matter from the scalar sector of 3-3-1 models without exotic electric charges
• Self Interacting Dark Matter in the Solar System
• The cusp-core problem in gas-poor dwarf spheroidal galaxies
• Cosmological implications of a Dark Matter self-interaction energy density
• Self-Interacting Dark Matter and the Delay of Super-Massive Black Hole Growth
• Cusped Mass Density Profiles and Magnification Ratios of Double Image Gravitational Lenses