PETRÁSEK, Martin and Petr SLANÝ. Equatorial Circular Orbits in the Kerr-Newman-de Sitter Spacetimes. In The Twelfth Marcel Grossmann Meeting on General Relativity. Singapore: World Scientific Publishing Co. Pte. Ltd., 2012, p. 1917-1919. ISBN 978-981-4374-51-4.
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Basic information
Original name Equatorial Circular Orbits in the Kerr-Newman-de Sitter Spacetimes
Authors PETRÁSEK, Martin and Petr SLANÝ.
Edition Singapore, The Twelfth Marcel Grossmann Meeting on General Relativity, p. 1917-1919, 3 pp. 2012.
Publisher World Scientific Publishing Co. Pte. Ltd.
Other information
Original language English
Type of outcome Proceedings paper
Field of Study 10308 Astronomy
Confidentiality degree is not subject to a state or trade secret
Organization unit Faculty of Philosophy and Science in Opava
ISBN 978-981-4374-51-4
Keywords in English Black holes; Cosmological constant; Particle motion
Tags sbornik, UF
Tags International impact
Links MSM4781305903, plan (intention).
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 15/2/2021 11:03.
Abstract
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.
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