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@inproceedings{46860, author = {Petrásek, Martin and Slaný, Petr}, address = {Singapore}, booktitle = {The Twelfth Marcel Grossmann Meeting on General Relativity}, keywords = {Black holes; Cosmological constant; Particle motion}, language = {eng}, location = {Singapore}, isbn = {978-981-4374-51-4}, pages = {1917-1919}, publisher = {World Scientific Publishing Co. Pte. Ltd.}, title = {Equatorial Circular Orbits in the Kerr-Newman-de Sitter Spacetimes}, year = {2012} }
TY - JOUR ID - 46860 AU - Petrásek, Martin - Slaný, Petr PY - 2012 TI - Equatorial Circular Orbits in the Kerr-Newman-de Sitter Spacetimes PB - World Scientific Publishing Co. Pte. Ltd. CY - Singapore SN - 9789814374514 KW - Black holes KW - Cosmological constant KW - Particle motion N2 - We present influence of cosmological constant on the character of geodesical equatorial circular orbits in the rotating and charged Kerr-Newman black-hole and naked singularity spacetimes. Conditions for the existence of geodesics are determined. Significant limits such as static radius and circular orbits are presented. In the Kerr-Newman-de Sitter spacetime, the existence of two static radii implies different situation in both plus- and minus-family circular orbits in comparison with the Kerr-de Sitter spacetime. Especially, in the naked singularity case, existence of so called plus-family orbits is now restricted by the rotational parameter, minus-family orbits exists not only between the outer static radius and minus-family circular photon orbit but also between the inner static radius and minus-family circular photon orbit. ER -
PETRÁSEK, Martin a Petr SLANÝ. Equatorial Circular Orbits in the Kerr-Newman-de Sitter Spacetimes. In \textit{The Twelfth Marcel Grossmann Meeting on General Relativity}. Singapore: World Scientific Publishing Co. Pte. Ltd., 2012, s.~1917-1919. ISBN~978-981-4374-51-4.
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