Abstract
We consider a black hole accreting spherically from the surrounding medium. If accretion produces a luminosity close to the Eddington limit, the hole acquires a net charge, so that electrons and ions can fall with the same velocity. The condition for the electrostatic field to be large enough to break the vacuum near the hole horizon translates into an upper limit for the hole mass of M~6.6 × 1020 g. The astrophysical conditions under which this phenomenon can take place are rather extreme, but in principle they could be met by a mini black hole residing at the center of a star.
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