Collimation of a spherical collisionless particles stream in Kerr space-time

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dc.creatorTakami, Kentaro
dc.creatorKojima, Yasufumi
dc.date2009-03-29
dc.date.accessioned2026-07-07T13:16:22Z
dc.date.available2026-07-07T13:16:22Z
dc.descriptionWe examine the propagation of collisionless particles emitted from a spherical shell to infinity. The number distribution at infinity, calculated as a function of the polar angle, exhibits a small deviation from uniformity. The number of particles moving from the polar region toward the equatorial plane is slightly larger than that of particles in the opposite direction, for an emission radius $ > 4.5M$ in extreme Kerr space-time. This means that the black hole spin exerts an anti-collimation effect on the particles stream propagating along the rotation axis. We also confirm this property in the weak field limit. The quadrupole moment of the central object produces a force toward the equatorial plane. For a smaller emission radius $r<4.5M$, the absorption of particles into the black hole, the non-uniformity and/or the anisotropy of the emission distribution become much more important.
dc.description11 pages, 8 figures; accepted for publication in CQG
dc.identifierhttps://arxiv.org/abs/0903.5030
dc.identifierhttp://arxiv.org/abs/0903.5030
dc.identifierClass.Quant.Grav.26:085013,2009
dc.identifierdoi:10.1088/0264-9381/26/8/085013
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/230765
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Astrophysical Phenomena
dc.titleCollimation of a spherical collisionless particles stream in Kerr space-time
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