A toroidal black hole for the AGN phenomenon
  A new approach to the study of the AGN phenomenon is proposed, in which the nucleus activity is related to the metric of the inner massive black hole. The possibility of a Toroidal Black Hole (TBH), in contrast to the usual Spherical Black Hole (SBH), is discussed as a powerful tool in understanding AGN related phenomena, such as the energetics, the production of jets and the acceleration of particles, the shape of the magnetic field and the lifetime of nucleus activity. 
Fulvio Pompilio (SISSA/ISAS, Italy), S. M. Harun-or-Rashid (University   of Helsinki, Finland), Matts Roos (University of He...