Self-Interacting Dark Matter with Naturally Light Mediator
  A promising proposal for resolving the cusp-core anomaly in the density
profile of dwarf galaxies is to allow dark matter to interact with itself
through a light mediator of mass much less than a GeV. The theoretical
challenge is to have a complete renormalizable theory where this happens
naturally even though dark matter itself may be of the electroweak scale, i.e.
100 GeV to 1 TeV. I propose here such a model, with just two neutral complex
scalar singlets under a softly broken dark global U(1) symmetry.
