Electron-positron outflow from black holes

Cosmological gamma-ray bursts (GRBs) appear as the brightest transient phen omena in the Universe. The nature of their central engine is a missing link in the theory of fireballs to stellar mass progenitors. and may be associa ted with low mass black holes. In contact with an external magnetic field B , black hole spin produces a gravitational potential on the wave function o f charged particles. We show that a rapidly rotating black hole of mass M p roduces outflow from initially electrostatic equilibrium with normalized is otropic emission similar to 10(48)(B/B-c)(2)(M/7M(circle dot))(2) sin(2) th eta erg/s, where B-c = 4.4 x 10(13) G. The half-opening angle satisfies the ta greater than or equal to root B-c/3B. The outflow proposed as input to G RB fireball models.