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Black holes in galactic centers: quasinormal ringing, grey-body factors and Unruh temperature
R. A. Konoplya
Recently, Cardoso et al. [arXiv:2109.00005] found an exact solution describing the black hole immersed in a galactic-like distribution of matter. There, the properties of gravitati…
Analytic formula for quasinormal modes in the near-extreme Kerr-Newman-de Sitter spacetime governed by a non-Pöschl-Teller potential
M. S. Churilova, R. A. Konoplya, A. Zhidenko
Quasinormal modes of scalar, electromagnetic, and gravitational fields in the extreme Schwarzschild-de Sitter background are known to be expressed in analytic form as eigenvalues o…
Wormholes without exotic matter: quasinormal modes, echoes and shadows
M. S. Churilova, R. A. Konoplya, Z. Stuchlik +1
An analytical solution representing traversable asymptotically flat and symmetric wormholes was obtained without adding exotic matter in two different theories independently: in th…
Traversable Wormholes in General Relativity
R. A. Konoplya, A. Zhidenko
In [J. Blazquez-Salcedo, C. Knoll, E. Radu, Phys. Rev. Lett. 126 (2021) no.10, 101102] asymptotically flat traversable wormhole solutions were obtained in the Einstein-Dirac-Maxwel…
Shadows of parametrized axially symmetric black holes allowing for separation of variables
R. A. Konoplya, A. Zhidenko
Metric of axially symmetric asymptotically flat black holes in an arbitrary metric theory of gravity can be represented in the general form which depends on infinite number of para…
General parametrization of wormhole spacetimes and its application to shadows and quasinormal modes
Kirill A. Bronnikov, Roman A. Konoplya, Thomas D. Pappas
The general parametrization for spacetimes of spherically symmetric Lorentzian, traversable wormholes in an arbitrary metric theory of gravity is presented. The parametrization is…