Primordial Black Holes, Hawking Radiation and the Early Universe
Abstract
The 511 keV gamma emission from the galactic core may originate from a high concentration ( 1022) of primordial black holes (PBHs) in the core each of whose Hawking radiation includes 1021 positrons per second. The PBHs we consider are taken as near the lightest with longevity greater than the age of the universe (mass 1012 kg; Schwarzschild radius 1 fm). These PBHs contribute only a small fraction of cold dark matter, PBH 10-8. This speculative hypothesis, if confirmed implies the simultaneous discovery of Hawking radiation and an early universe phase transition.
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