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Conversion of protons to positrons by a black hole
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abstract
The conversion of protons to positrons at the horizon of a black hole (BH) is considered. It is shown that the process may efficiently proceed for BHs with masses in the range $\sim 10^{18}$ -- $10^{21}$ g. It is argued that the electric charge of BH acquired by the proton accretion to BH could create electric field near BH horizon close to the critical Schwinger one. It leads to efficient electron-positron pair production, when electrons are back captured by the BH while positrons are emitted into outer space. Annihilation of these positrons with electrons in the interstellar medium may at least partially explain the origin of the observed 511 keV line.
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Cited by 1 Pith paper
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Antimatter in the universe and Milky Way
A review-style paper asserts that primordial antimatter produced during inflation populates the Milky Way and that observations of positrons, antihelium, and antistar candidates confirm this prediction.
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