Primordial Black Holes in Matter-Dominated Eras: the Role of Accretion
7. December 2021
V. De Luca, G. Franciolini, A. Kehagias, P. Pani, A. Riotto (2021) [arXiv:2112.02534].
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.