Zobrazeno 1 - 10
of 34
pro vyhledávání: '"Slany, Petr"'
Autor:
Slaný, Petr
Publikováno v:
J. High Energy Astrophys. 42 (2024), pp. 205-208
Cosmic repulsion represented by a small positive value of the cosmological constant changes significantly properties of central gravitational fields at large distances, leading to existence of a static (or turnaround) radius where gravitational attra
Externí odkaz:
http://arxiv.org/abs/2405.11587
Autor:
Slaný, Petr
Both circular and epicyclic motion of test particles along equatorial circular orbits in the revisited Kerr-de Sitter spacetime is analyzed. We present relations for specific energy, specific angular momentum and Keplerian angular velocity of particl
Externí odkaz:
http://arxiv.org/abs/2310.04250
Publikováno v:
Classical and Quantum Gravity, 37, 245007 (2020)
Charged fluids rotating around compact objects can form unique equilibrium structures when ambient large-scale electromagnetic fields combine with strong gravity. Equatorial as well as off-equatorial toroidal structures are among such figures of equi
Externí odkaz:
http://arxiv.org/abs/2011.15025
We discuss the effects of electric charging on the equilibrium configurations of magnetized, rotating fluid tori around black holes of different mass. In the context of gaseous/dusty tori in galactic nuclei, the central black hole dominates the gravi
Externí odkaz:
http://arxiv.org/abs/1901.06518
Autor:
Kovář, Jiří, Slaný, Petr, Cremaschini, Claudio, Stuchlík, Zdeněk, Karas, Vladimír, Trova, Audrey
Publikováno v:
Physical Review D 90, 044029 (2014)
We study charged-fluid toroidal structures surrounding a non-rotating charged black hole immersed in a large-scale, asymptotically uniform magnetic field. In continuation of our former study on electrically charged matter in approximation of zero con
Externí odkaz:
http://arxiv.org/abs/1409.0418
The possible occurrence of equilibrium off-equatorial tori in the gravitational and electromagnetic fields of astrophysical compact objects has been recently proved based on non-ideal MHD theory. These stationary structures can represent plausible ca
Externí odkaz:
http://arxiv.org/abs/1309.3979
Autor:
Kovář, Jiří, Slaný, Petr, Stuchlík, Zdeněk, Karas, Vladimír, Cremaschini, Claudio, Miller, John C.
Publikováno v:
Physical Review D 84, 084002 (2011)
Astrophysical fluids may acquire non-zero electrical charge because of strong irradiation or charge separation in a magnetic field. In this case, electromagnetic and gravitational forces may act together and produce new equilibrium configurations, wh
Externí odkaz:
http://arxiv.org/abs/1110.4843
Publikováno v:
Class. Quantum Grav. 28 (2011) 175002
We study the non-monotonic Keplerian velocity profiles related to locally non-rotating frames (LNRF) in the field of near-extreme braneworld Kerr black holes and naked singularities in which the non-local gravitational effects of the bulk are represe
Externí odkaz:
http://arxiv.org/abs/1108.0191
Autor:
Slany, Petr, Stuchlik, Zdenek
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-extreme Kerr black-hole with the spin near 0.998 and mass M<7.3M_sun.
Externí odkaz:
http://arxiv.org/abs/0810.0237
Publikováno v:
In Proceedings of RAGtime 8/9, 15-19/19-21 September, 2006/2007, Hradec nad Moravici, Czech Republic, Silesian University in Opava, 2007, pp. 449-467
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 for marginally stable thick discs. Such a "humpy" LNRF-velocity profil
Externí odkaz:
http://arxiv.org/abs/0802.3844