Simple Models for the Distribution of Dark Matter
  We introduce a simple family of models for representing the dark matter in galaxies. The potential and phase space distribution function are all elementary, while the density is cusped. The models are all hypervirial, that is, the virial theorem holds locally, as well as globally. As an application to dark matter studies, we compute some of the properties of gamma-ray sources caused by neutralino self-annihilation in dark matter clumps. 
Jin H. An (1,2), N. Wyn Evans (1) ((1) IoA Cambridge, (2) MKI-MIT)