Isocurvature Perturbations and Non-Gaussianity of Gravitationally
  Produced Nonthermal Dark Matter
  Gravitational particle production naturally occurs during the transition from
the inflationary phase to the non-inflationary phase. If the particles are
stable and very weakly interacting, they are natural nonthermal dark matter
candidates. We show that such nonthermal dark matter particles can produce
local non-Gaussianities large enough to be observed by ongoing and near future
experiments without being in conflict with the existing isocurvature bounds. Of
particular interest is the fact that these particles can be observable through
local non-Gaussianities even when they form a very small fraction of the total
dark matter content.
