PBH Dark Matter in Supergravity Inflation Models
  We propose a novel scenario to produce abundant primordial black holes (PBHs)
in new inflation which is a second phase of a double inflation in the
supergravity frame work. In our model, some preinflation phase before the new
inflation is assumed and it would be responsible for the primordial curvature
perturbations on the cosmic microwave background scale, while the new inflation
produces only the small scale perturbations. Our new inflation model has
linear, quadratic, and cubic terms in its potential and PBH production
corresponds with its flat inflection point. The linear term can be interpreted
to come from a supersymmetry-breaking sector, and with this assumption, the
vanishing cosmological constant condition after inflation and the flatness
condition for the inflection point can be consistently satisfied.
