Zobrazeno 1 - 10
of 122
pro vyhledávání: '"Krtous, Pavel"'
In the present paper we discuss properties of a model of a ring wormhole, recently proposed by Gibbons and Volkov. Such a wormhole connects two flat spacetimes which are glued through discs of the radius $a$ bounded by the string with negative angle
Externí odkaz:
http://arxiv.org/abs/2305.03887
Autor:
Polášková, Eliška, Krtouš, Pavel
Publikováno v:
Phys. Rev. D 105, 044041 (2022)
We study a limit of the Kerr-(A)dS spacetime in a general dimension where an arbitrary number of its rotational parameters is set equal. The resulting metric after the limit formally splits into two parts - the first part has the form of the Kerr-NUT
Externí odkaz:
http://arxiv.org/abs/2111.03734
We study a critical limit in which asymptotically-AdS black holes develop maximal conical deficits and their horizons become non-compact. When applied to stationary rotating black holes this limit coincides with the "ultraspinning limit" and yields t
Externí odkaz:
http://arxiv.org/abs/1911.12817
Autor:
Krtouš, Pavel, Zelnikov, Andrei
Publikováno v:
Phys. Rev. D 102, 024065 (2020)
We study the self-force acting on a static charged point-like particle near a Schwarzschild black hole. We obtain the point-like particle as a limit of a spacetime describing a big neutral black hole with a small charged massive object nearby. The ma
Externí odkaz:
http://arxiv.org/abs/1910.04290
Autor:
Krtouš, Pavel, Zelnikov, Andrei
Publikováno v:
JHEP02(2020)164
We study a system of two charged non-rotating black holes separated by a strut. Using the exact solution of the Einstein-Maxwell equations, which describes this system, we construct a consistent form of the first law of thermodynamics. We derive ther
Externí odkaz:
http://arxiv.org/abs/1909.13467
Autor:
Kolar, Ivan, Krtous, Pavel
Publikováno v:
Phys. Rev. D 100, 064014 (2019)
We study fixed points of isometries of the higher-dimensional Kerr-NUT-(A)dS spacetimes that form generalizations of symmetry axes. It turns out that, in the presence of nonzero NUT charges, some parts of the symmetry axes are necessarily singular an
Externí odkaz:
http://arxiv.org/abs/1905.06585
Autor:
Frolov, Valeri P., Krtouš, Pavel
Publikováno v:
Phys. Rev. D 99, 044044 (2019)
We study properties of a recently proposed new ansatz for separation of variables in the Maxwell equations in four dimensional Kerr-NUT-(A)dS spacetime. We demonstrate that a dual field, which is also a solution of the source-free Maxwell equations,
Externí odkaz:
http://arxiv.org/abs/1812.08697
Publikováno v:
Eur. Phys. J. C 78, 661 (2018)
The Jacobi equation for geodesic deviation describes finite size effects due to the gravitational tidal forces. In this paper we show how one can integrate the Jacobi equation in any spacetime admitting completely integrable geodesics. Namely, by lin
Externí odkaz:
http://arxiv.org/abs/1805.07677
Publikováno v:
Phys. Rev. Lett. 120, 231103 (2018)
We demonstrate the separability of the massive vector (Proca) field equation in general Kerr-NUT-(A)dS black hole spacetimes in any number of dimensions, filling a long-standing gap in the literature. The obtained separated equations are studied in m
Externí odkaz:
http://arxiv.org/abs/1804.00030
Publikováno v:
Nucl. Phys. B 934, 7-38 (2018)
In this paper we explicitly demonstrate separability of the Maxwell equations in a wide class of higher-dimensional metrics which include the Kerr-NUT-(A)dS solution as a special case. Namely, we prove such separability for the most general metric ad
Externí odkaz:
http://arxiv.org/abs/1803.02485