The role of the ergosphere in the Blandford-Znajek process

Details The role of the ergosphere in the Blandford-Znajek process The role of the ergosphere in the Blandford-Znajek process

2012-03-19

arxiv.org/abs/1203.4125v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, 11 figures. Accepted for publication in MNRAS

Scientific paper

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.

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