Zobrazeno 1 - 10
of 104
pro vyhledávání: '"Bicak, Jiri"'
Effect of cold plasma on the form of rays propagating in the equatorial plane of a rotating black hole is investigated. Two kinds of regions in the radius-impact parameter plane allowed for the rays are constructed: for radiation with a given frequen
Externí odkaz:
http://arxiv.org/abs/2312.04451
Autor:
Bezdekova, Barbora, Bicak, Jiri
The light propagation in plasma medium around stationary gravitating objects is studied in the geometrical optics limit. Static metrics with quadrupole moments are considered, however, the main attention is paid to the stationary Hartle-Thorne metric
Externí odkaz:
http://arxiv.org/abs/2309.14766
Publikováno v:
Phys. Rev. D 107, 104014 (2023)
By considering a misaligned (asymptotically uniform) magnetic field in the background of a rotating black hole, we uncover a possibility for a highly non-trivial motion of Carrollian particles on the black hole horizon that is characterized by a time
Externí odkaz:
http://arxiv.org/abs/2302.11639
Autor:
Bičák, Jiří, Ledvinka, Tomáš
Publikováno v:
International Journal of Modern Physics D, Vol. 31, No. 03, p. 2230004 (2022)
In this paper, we review and analyze four specific general-relativistic problems in which gravitomagnetism plays an important role: the dragging of magnetic fields around rotating black holes, dragging inside a collapsing slowly rotating spherical sh
Externí odkaz:
http://arxiv.org/abs/2206.12397
The properties of light rays around compact objects surrounded by a plasma are affected by both strong gravitational fields described by a general-relativistic spacetime and by a dispersive and refractive medium, characterized by the density distribu
Externí odkaz:
http://arxiv.org/abs/2204.05593
Publikováno v:
Physics Letters B 820, 136482 (2021)
We investigate the sensitivity of an Unruh-DeWitt detector to the global features of a deficit angle that are otherwise classically inaccessible. Specifically, we consider a detector placed inside an infinite thin hollow cylinder whose spacetime is e
Externí odkaz:
http://arxiv.org/abs/2103.05802
Publikováno v:
Phys. Rev. D 103, 024027 (2021)
A relativistic theory of gravity like general relativity produces phenomena differing fundamentally from Newton's theory. An example, analogous to electromagnetic induction, is gravitomagnetism, or the dragging of inertial frames by mass-energy curre
Externí odkaz:
http://arxiv.org/abs/2009.10584
We study the response function of Unruh-deWitt detectors placed in a flat spacetime inside a thin matter shell. We show that the response function distinguishes between the local and global (Minkowski) inertial frames and picks up the presence of the
Externí odkaz:
http://arxiv.org/abs/2003.09719
Autor:
Ledvinka, Tomáš, Bičák, Jiří
We construct the disk sources matched to the exact vacuum Kerr and to the two classes of Tomimatsu-Sato spacetimes. We analyze two models of the matter forming these disks. At each radius we consider either a rotating massive ring with pressure or tw
Externí odkaz:
http://arxiv.org/abs/1903.01726
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