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Orbital resonances in discs around braneworld Kerr black holes
Zdenek Stuchlik, Andrea Kotrlova
Rotating black holes in the brany universe of the Randall-Sundrum type are described by the Kerr geometry with a tidal charge b representing the interaction of the brany black hole…
Black Holes Admitting Strong Resonant Phenomena
Zdenek Stuchlik, Andrea Kotrlova, Gabriel Torok
High-frequency twin peak quasiperiodic oscillations (QPOs) are observed in four microquasars, i.e., Galactic black hole binary systems, with frequency ratio very close to 3:2. In t…
Profiles of emission lines generated by rings orbiting braneworld Kerr black holes
Jan Schee, Zdenek Stuchlik
In the framework of the braneworld models, rotating black holes can be described by the Kerr metric with a tidal charge representing the influence of the non-local gravitational (t…
Quasiperiodic oscillations in a strong gravitational field around neutron stars testing braneworld models
Andrea Kotrlova, Zdenek Stuchlik, Gabriel Torok
The strong gravitational field of neutron stars in the brany universe could be described by spherically symmetric solutions with a metric in the exterior to the brany stars being o…
Optical phenomena in brany Kerr spacetimes
Jan Schee, Zdenek Stuchlik
We study the influence of the tidal charge parameter of the braneworld models onto some optical phenomena in rotating black hole spacetimes. The escape photon cones are determined…
Mass estimate of the XTE J1650-500 black hole from the Extended Orbital Resonance Model for high-frequency QPOs
Petr Slany, Zdenek Stuchlik
XTE J1650-500 is a Galactic black-hole binary system for which at least one high-frequency QPO at 250Hz was reported. Moreover there are indications that the system harbours a near…
Influence of the relict cosmological constant on accretion discs
Z. Stuchlik
Surprisingly, the relict cosmological constant has a crucial influence on properties of accretion discs orbiting black holes in quasars and active galactic nuclei. We show it by co…
Pseudo-Newtonian gravitational potential for Schwarzschild-de Sitter spacetimes
Zdenek Stuchlik, Jiri Kovar
Pseudo-Newtonian gravitational potential describing the gravitational field of static and spherically symmetric black holes in the universe with a repulsive cosmological constant i…
Off-equatorial orbits in strong gravitational fields near compact objects
Jiri Kovar, Zdenek Stuchlik, Vladimir Karas
Near a black hole or an ultracompact star, motion of particles is governed by strong gravitational field. Electrically charged particles feel also electromagnetic force arising due…
Properties of the Reissner-Nordström Spacetimes with a Nonzero Cosmological Constant
Zdeněk Stuchlík, Stanislav Hledík
Properties of the Reissner-Nordström black-hole and naked-singularity spacetimes with a nonzero cosmological constant are represented by their geodetical structure and embedding di…
Equatorial photon motion in the Kerr-Newman spacetimes with a non-zero cosmological constant
Zdeněk Stuchlík, Stanislav Hledík
Discussion of the equatorial photon motion in Kerr-Newman black-hole and naked-singularity spacetimes with a non-zero cosmological constant is presented. Both repulsive and attract…
Photon capture cones and embedding diagrams of the Ernst spacetime
Zdeněk Stuchlík, Stanislav Hledík
The differences between the character of the Schwarzschild and Ernst spacetimes are illustrated by comparing the photon capture cones, and the embedding diagrams of the $t=\mathrm{…
Genetic selection of neutron star structure matching the X-ray observations
Zdenek Stuchlik, Petr Cermak, Gabriel Torok +2
Assuming a resonant origin of the quasiperiodic oscillations observed in the X-ray neutron star binary systems, we apply a genetic algorithm method for selection of neutron star mo…
Extended orbital resonance model with hump-induced oscillations
Zdenek Stuchlik, Petr Slany, Gabriel Torok
Change of sign of the LNRF-velocity gradient has been found for accretion discs orbiting rapidly rotating Kerr black holes with spin a > 0.9953 for Keplerian discs and a > 0.99979…
Distribution of kilohertz QPO frequencies and their ratios in the atoll source 4U 1636-53
Gabriel Torok, Marek A. Abramowicz, Pavel Bakala +5
A recently published study on long term evolution of the frequencies of the kilohertz quasi-periodic oscillations (QPOs) in the atoll source 4U 1636-53 concluded that there is no p…
On the origin of clustering of frequency ratios in the atoll source 4U 1636-53
Gabriel Torok, Michal Bursa, Jiri Horak +4
A long discussion has been devoted to the issue of clustering of the kHz QPO frequency ratios in the neutron star sources. While the distribution of ratios inferred from an occurre…