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Primordial Black Holes in Matter-Dominated Eras: the Role of Accretion
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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.
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Cited by 2 Pith papers
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Gravitational wave signatures of primordial black hole accretion during early matter domination
PBHs that form in a radiation era and accrete during an early matter era could produce a two-peak GW background detectable by LISA or BBO for asteroid-mass PBHs as all of dark matter.
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Relativistic accretion and burdened primordial black holes
Combining relativistic accretion with memory-burdened evaporation widens the parameter space for primordial black holes as dark matter and changes dark matter and dark radiation emission predictions.
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