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Black hole spin down in GRB observations and Cosmology
Antonios Nathanail, Ioannis Contopoulos, Spyros Basilakos
According to Blandford & Znajek (1977), energy can be extracted electromagnetically from a rotating black hole, should the latter be endowed with a magnetic field supported by elec…
Accretion disk radiation dynamics and the cosmic battery
Leela E. Koutsantoniou, Ioannis Contopoulos
We investigate the dynamics of radiation in an astrophysical accretion disk around a Kerr black hole. The source of the radiation is the accretion disk itself, and not a central ob…
Black Hole Magnetospheres
Antonios Nathanail, Ioannis Contopoulos
We investigate the structure of the steady-state force-free magnetosphere around a Kerr black hole in various astrophysical settings. The solution Psi(r,theta) depends on the distr…