The role of the ergosphere in the Blandford-Znajek process

Abstract

The Blandford-Znajek process, one of the most promising model for powering the relativistic jets from black holes, was initially introduced as a mechanism in which the magnetic fields extract energy from a rotating black hole. We study the evolution of force-free electromagnetic fields on regular spacetimes with an ergosphere, which are generated by rapidly rotating stars. Our conclusive results confirm previous works, claiming that the Blandford-Znajek mechanism is not directly related to the horizon of the black hole. We also show that the radiated energy depends exponentially on the compactness of the star.

arXiv comment10 pages, 11 figures. Accepted for publication in MNRAS

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• The Black Hole Meissner Effect and Blandford-Znajek Jets
• Magnetosphere of a spinning black hole and the role of the current sheet
• A novel scheme for simulating the force-free equations: boundary conditions and the evolution of solutions towards stationarity
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• Blandford-Znajek Process in Quadratic Gravity
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• Magnetic Ergostars, Jet Formation and Gamma-Ray Bursts: Ergoregions versus Horizons
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