6 papers
Quasinormal Modes and Hawking Radiation of Black Holes with Primary Scalar Hair
Roman Konoplya, Oleksandr Stashko, ZdenÄk StuchlÃk
Recently, a new family of asymptotically flat black-hole solutions endowed with primary scalar hair has been discovered in beyond-Horndeski gravity. We study in detail the quasinor…
Shadows of naked singularities and superspinars related to the revisited Kerr-de Sitter spacetimes
Daniel Charbulák, ZdenÄk StuchlÃk
We construct shadows of superspinars described by the revisited Kerr-de Sitter (rKdS) naked singularity (NS) spacetimes and compare them with those of the standard KdSNS spacetimes…
Charged black hole surrounded by a galactic halo in de Sitter universe
R. A. Konoplya, Z. StuchlÃk, A. Zhidenko
Assuming a sufficiently general form for the matter distribution function of a galactic halo, we have derived solutions to the Einstein-Maxwell equations describing a charged black…
Massive fields affected by echoes: New physics vs. astrophysical environment
R. A. Konoplya, Z. StuchlÃk, A. Zhidenko
Unlike the perturbations of massless fields, the asymptotic tails of massive fields exhibit oscillations and decay slowly, following a power-law envelope. In this work, considering…
Overtones behavior of higher dimensional black holes in the Einstein-Gauss-Bonnet gravity
Z. StuchlÃk, A. Zhidenko
Gravitational perturbations of higher-dimensional black holes in the Einstein-Gauss-Bonnet theory, proposed by Boulware and Deser, have been extensively studied in numerous works,…
Non-oscillatory gravitational quasinormal modes of Reissner-Nordström-de Sitter spacetime
Z. StuchlÃk, A. Zhidenko
Proper oscillation frequencies of black holes (quasinormal modes) of asymptotically de Sitter black holes were extensively studied, yet the non-oscillatory (purely imaginary) branc…