Type: Article
Publication Date: 2005-07-08
Citations: 14
DOI: https://doi.org/10.1142/s0217732305017688
The 511 keV gamma emission from the galactic core may originate from a high concentration (~ 10 22 ) of primordial black holes (PBHs) in the core, each of whose Hawking radiation includes ~ 10 21 positrons per second. The PBHs we consider are taken as near the lightest with longevity greater than the age of the universe (mass ~ 10 12 kg ; Schwarzschild radius ~ 1 fm ). These PBHs contribute only a small fraction of cold dark matter, Ω PBH ~ 10 -8 . This speculative hypothesis, if confirmed implies the simultaneous discovery of Hawking radiation and an early universe phase transition.