Subhaloes in self-interacting galactic dark matter haloes

We present N-body simulations of a new class of self-interacting dark matter models, which do not violate any astrophysical constraints due to a non-power-law velocity dependence of the transfer cross-section which is motivated by a Yukawa-like new gauge boson interaction. Specifically, we focus on the formation of a Milky-Way-like dark matter halo taken from the Aquarius project and resimulate it for a couple of representative cases in the allowed parameter space of this new model. We find that for these cases, the main halo only develops a small core (1 kpc) followed by a density profile identical to that of the standard cold dark matter scenario outside of that radius. Neither the subhalo mass function nor…

• NS
  National Science Foundation

  Awards: NNA09DB30A, AST-0907890, 0907890, NNX08AL43G
• NA
  National Aeronautics and Space Administration

  Awards: AST-0907890, NNA09DB30A, NNX08AL43G
• HU
  Harvard University
• GO
  Government of Canada
• IC
  Industry Canada
• UO
  University of Waterloo
• IP
  Institut Périmètre de physique théorique