The ergoregion in the Kerr spacetime: properties of the equatorial circular motion

@article{50381,
   author = {Pugliese, Daniela and Quevedo, Hernando},
   article_location = {US - Spojené státy americké},
   article_number = {5},
   doi = {http://dx.doi.org/10.1140/epjc/s10052-015-3455-0},
   keywords = {Kerr spacetime; ergoregion; circular geodesic},
   issn = {1434-6044},
   journal = {The European Physical Journal C},
   title = {The ergoregion in the Kerr spacetime: properties of the equatorial circular motion},
   url = {https://link.springer.com/article/10.1140/epjc/s10052-015-3455-0},
   volume = {75},
   year = {2015}
}

TY  - JOUR
ID  - 50381
AU  - Pugliese, Daniela - Quevedo, Hernando
PY  - 2015
TI  - The ergoregion in the Kerr spacetime: properties of the equatorial circular motion
JF  - The European Physical Journal C
VL  - 75
IS  - 5
SP  - "234-1"-"234-20"
EP  - "234-1"-"234-20"
SN  - 14346044
KW  - Kerr spacetime
KW  - ergoregion
KW  - circular geodesic
UR  - https://link.springer.com/article/10.1140/epjc/s10052-015-3455-0
N2  - 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
ER  - 

PUGLIESE, Daniela and Hernando QUEVEDO. The ergoregion in the Kerr spacetime: properties of the equatorial circular motion. \textit{The European Physical Journal C}. US - Spojené státy americké, 2015, vol.~75, No~5, p.~''234-1''-''234-20'', 20 pp. ISSN~1434-6044. Available from: https://dx.doi.org/10.1140/epjc/s10052-015-3455-0.