Departament d'Astronomia i Astrofísica
Universitat de València |

Magnetized orbits in black hole fields: a conspiracy between magnetic fields and geometric curvature

*Fernando de Felice*

*Dipartimento di Fisica G. Galilei, Università di Padova, Itàlia*

*Seminari del Departament d'Astronomia i Astrofísica*

*Dimecres 18 febrer 2004*

*12:00*

**Resum**

*We consider the motion of magnetized particles near a rotating black hole.The main result is that the spacetime curvature and the electromagnetic field conspire to allow for the existence, inside the ergosphere, of stable circular orbits occupied by particles with negative total energy and angular momentum. A large binding energy is required to store particles on these orbits. A simple model of magnetized belt in the ergosphere of a massive and rotating black hole surrounded by a strong magnetic field shows that one can store a binding energy as high as 10E54 ergs, an amount comparable with the energy detected in gamma ray bursts.*