Primordial Black Holes in Matter-Dominated Eras: the Role of Accretion
  We consider the role of secondary infall and accretion onto an initially
overdense perturbation in matter-dominated eras, like the one which is likely
to follow the end of inflation. We show that primordial black holes may form
through post-collapse accretion, namely the accretion onto an initial
overdensity whose collapse has not given rise to a primordial black hole.
Accretion may be also responsible for the growth of the primordial black hole
masses by orders of magnitude till the end of the matter-dominated era.
