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Chaotic motion in the Johannsen-Psaltis spacetime
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SYSNO ASEP 0484970 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Chaotic motion in the Johannsen-Psaltis spacetime Author(s) Zelenka, Ondřej (CZ) ORCID
Lukes-Gerakopoulos, Georgios (ASU-R) ORCIDSource Title Proceedings of RAGtime 17/19: Workshops on black holes and neutron stars. - Opava : Silesian University, 2017 - ISSN 2336-5668 - ISBN 9788075102577 Pages s. 253-260 Number of pages 8 s. Publication form Print - P Action RAGtime /17.-19./ Event date 17.11.2015 - 19.11.2015 VEvent location Opava Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords chaos ; geodesic motion ; black holes Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) R&D Projects GJ17-06962Y GA ČR - Czech Science Foundation (CSF) Institutional support ASU-R - RVO:67985815 EID SCOPUS 85041852389 Annotation The Johannsen-Psaltis spacetime is a perturbation of the Kerr spacetime designed to avoid pathologies like naked singularities and closed timelike curves. This spacetime depends not only on the mass and the spin of the compact object, but also on extra parameters, making the spacetime deviate from Kerr. In this work we consider only the lowest order physically meaningful extra parameter. We use numerical examples to show that geodesic motion in this spacetime can exhibit chaotic behavior. We study the corresponding phase space by using Poincaré sections and rotation numbers to show chaotic behavior, and we use Lyapunov exponents to directly estimate the sensitivity to initial conditions for chaotic orbits. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2018
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