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Pair Production By Primordial Black Hole Evaporation, Shaun Hampton

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Here we investigate the evaporation of a 8.2 _ 1010 kg primordial black hole. This mass is shown to
satifisfy the compactness parameter constraint L/R ≥ 1031 ergscm−1s−1. We assume only photon-photon
production according to a Planck distribution. We calculate the distance from the black hole at which the
optical depth due to photon-photon collisions to produce positron/electron pairs becomes unity in which a
pair plasma is produced within a volume of inner radius of 90RS and outer radius 123000R_S respectively.
We then calculate corresponding positron/electron production rates, production rate densities, and optical
depth rates due to subsequent Compton …