Primordial Black Holes from Inflation and Quantum Diffusion
  Primordial black holes as dark matter may be generated in single-field models
of inflation thanks to the enhancement at small scales of the comoving
curvature perturbation. This mechanism requires leaving the slow-roll phase to
enter a non-attractor phase during which the inflaton travels across a plateau
and its velocity drops down exponentially. We argue that quantum diffusion has
a significant impact on the primordial black hole mass fraction making the
classical standard prediction not trustable.
