Plasma injection and jet formation in Kerr black holes

I will discuss plasma injection and jet formation around black holes, with focus on jets associated with gamma-ray bursts (GRBs). Two competing jet formation mechanisms have been widely discussed in the literature; magnetic extraction of the spin down power of a Kerr black hole (Blandford-Znajek process), and outflow formation via neutrino annihilation above the horizon. These two processes are commonly treated under idealized conditions: models of BZ jets usually invoke the force-free limit and ignore loading of magnetic field lines, whereas models of jets driven by neutrino annihilation are usually constructed within the pure hydrodynamic limit. In GRBs, however, both processes might be at work; I will show the interplay between them.

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