J
2015
The ergoregion in the Kerr spacetime: properties of the equatorial circular motion
PUGLIESE, Daniela and Hernando QUEVEDO
Basic information
Original name
The ergoregion in the Kerr spacetime: properties of the equatorial circular motion
Name (in English)
The ergoregion in the Kerr spacetime: properties of the equatorial circular motion
Edition
The European Physical Journal C, US - Spojené státy americké, 2015, 1434-6044
Other information
Type of outcome
Článek v odborném periodiku
Field of Study
10303 Particles and field physics
Confidentiality degree
není předmětem státního či obchodního tajemství
Organization unit
Institute of physics in Opava
Keywords in English
Kerr spacetime; ergoregion; circular geodesic
Tags
International impact, Reviewed
V originále
We investigate in detail the circular motion of test particles in the equatorial plane of the ergoregion in the Kerr spacetime. We consider all the regions where circular motion is allowed, and we analyze the stability properties and the energy and angular momentum of the test particles. We show that the structure of the stability regions has definite features that make it possible to distinguish between black holes and naked singularities. The naked singularity case presents a very structured non-connected set of regions of orbital stability, where the presence of counterrotating particles and zero angular momentum particles for a specific class of naked singularities is interpreted as due to the presence of a repulsive field generated by the centralsource of gravity. In particular, we analyze the effects of the dynamical structure of the ergoregion (the union of the orbital regions for different attractor spins) on the behavior of accretion disks around the central source. The prope
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