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- Charged particle motion in magnetized black holes

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PIRSA Number:

13110066

There exist evidences that magnetic field in

the vicinity of astrophysical black holes plays an important role. In

particular it is required for explanation of such phenomenon as jet formation.

Study of such problems in all their complexity requires 3D numerical

simulations of the magnetohydrodynamics in a strong gravitational field. Quite

often when dealing with such a complicated problem it is instructive to

consider first its simplifications, which can be treated either analytically,

or by integrating ordinary differential equations. Motion of a charged particle

in a weakly magnetized black hole is an important example. We consider a

non-rotating black hole in the weak magnetic field which is homogeneous at infinity.

In the talk I discuss the following problems: How does such a magnetic field

affect charged particle motion in the equatorial plane? How does it change the

radius of the innermost stable circular orbits (ISCO) and period of rotation? I

shall demonstratethat the magnetic field increases the efficiency of the energy

extraction from the black hole and that magnetized black holes can be used as

"particle accelerators". Finally, I shall discuss

out-of-equatorial-plane motion and demonstrate that it is chaotic. Possible

applications of these results to astrophysics are briefly discussed.

©2012 Perimeter Institute for Theoretical Physics