Endothermic self-interacting dark matter in milky way-like dark matter haloes

Abstract Self-interacting dark matter (SIDM) offers the potential to mitigate some of discrepancies between simulated cold (CDM) and observed galactic properties. We introduce a physically motivated SIDM model understand effects self interactions on properties Milky Way dwarf galaxy sized haloes. This consists with nearly degenerate excited state, which allows for both elastic inelastic scattering. In particular, includes significant probability particles up-scatter from ground state state. simulate suite zoom-in Way-sized N-body haloes six models different scattering cross sections study up-scattering in models. find that reaction greatly increases central densities main halo through loss kinetic energy. However, physical still results coring due presence down-scattering. These are not as apparent subhalo population compared halo, but number subhaloes is reduced CDM.