Black holes, magnetic fields and particle creation

Astronomy and Astrophysics – Astronomy

Scientific paper

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Black Holes (Astronomy), Magnetic Flux, Stellar Magnetic Fields, Charged Particles, Magnetic Effects, Particle Production, Stellar Mass Ejection, Stellar Rotation

Scientific paper

Wald (1974) has given a classical argument suggesting that a rotating black hole immersed in a uniform magnetic field, B, will acquire a charge, Q = 2JB, where J is the angular momentum of the hole. The note contains a quantum-field theoretical treatment of this process. For fields greater than 4 by 10 to the 13th power G, the black hole will rapidly emit charged particles to achieve the equilibrium value. If B is less than the critical value, the charge will remain zero.

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