TL;DR
This paper explores the formation of primordial black holes during the early universe, highlighting mechanisms for producing a wide mass range and their potential role as dark matter and supermassive black holes.
Contribution
It demonstrates that hybrid inflation with parametric resonance can produce primordial black holes of arbitrary mass, expanding the possible mass range beyond previous limits.
Findings
PBHs could account for dark matter in galaxies and clusters
Hybrid inflation can generate PBHs of any mass
PBHs may explain the origin of supermassive black holes
Abstract
We investigate Primoridal Black Hole (PBH) formation by which we mean black holes produced in the early universe during radiation domination. After discussing the range of PBH mass permitted in the original mechanism of Carr and Hawking, hybrid inflation with parametric resonance is presented as an existence theorem for PBHs of arbitrary mass. As proposed in arXiv:1510.00400, PBHs with many solar masses can provide a solution to the dark matter problem in galaxies. PBHs can also explain dark matter observed in clusters and suggest a primordial origin for supermassive black holes in galactic cores.
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