Constraints on Primordial Black Holes: the Importance of Accretion

Abstract

We consider the constraints on the fraction of dark matter in the universe in the form of primordial black holes taking into account the crucial role of accretion which may change both their mass and mass function. We show that accretion may drastically weaken the constraints at the present epoch for primordial black holes with masses larger than a few solar masses.

arXiv comment6 pages, 4 figures. v2 : matching published version

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