Vacuum Breakdown near a Black Hole Charged by Hypercritical Accretion

Details Vacuum Breakdown near a Black Hole Charged by Hypercritical Accretion Vacuum Breakdown near a Black Hole Charged by Hypercritical Accretion

1998-12-21

arxiv.org/abs/astro-ph/9812383v1

Astronomy and Astrophysics

Astrophysics

6 pages, accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/307159

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, $M\sim 6.6\times 10^{20} {\rm g}.$ The astrophysical conditions under which this phaenomenon 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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