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Arbitrarily long-lived quasinormal modes in a wormhole background
Churilova M.S., Konoplya R.A., Zhidenko A.
of massive fields for a number of black-hole backgrounds at some discrete values of mass of the field. Here
General parametrization of black holes: The only parameters that matter
Konoplya R.A., Zhidenko A.
The general parametrization of a black-hole spacetime in arbitrary metric theories of gravity
Einstein-scalar-Gauss-Bonnet black holes: Analytical approximation for the metric and applications to calculations of shadows
Konoplya R.A., Pappas T., Zhidenko A.
of the continued-faction expansion in terms of a compact coordinate in order to obtain an analytical approximation
Shadows of parametrized axially symmetric black holes allowing for separation of variables
Konoplya R.A., Zhidenko A.
on a few deformation parameters only. We analyze the influence of these parameters on the black
Analytical representation for metrics of scalarized Einstein-Maxwell black holes and their shadows
Konoplya R.A., Zhidenko A.
Instabilities of wormholes and regular black holes supported by a phantom scalar field
Bronnikov K.A., Konoplya R.A., Zhidenko A.
We test the stability of various wormholes and black holes supported by a scalar field with a
Echoes of compact objects: New physics near the surface and matter at a distance
Konoplya R.A., Stuchlik Z., Zhidenko A.
It is well known that a hypothetical compact object that looks like an Einsteinian (Schwarzschild
On the stability of scalar-vacuum space-times
Bronnikov K.A., Fabris J.C., Zhidenko A.
We study the stability of static, spherically symmetric solutions to the Einstein equations with a
No stable wormholes in Einstein-dilaton-Gauss-Bonnet theory
Cuyubamba M.A., Konoplya R.A., Zhidenko A.
. The exponential growth appears in the time domain after a long period of damped oscillations, in the same way
Black holes in the four-dimensional Einstein-Lovelock gravity
Konoplya R.A., Zhidenko A.
A (3+1)-dimensional Einstein-Gauss-Bonnet theory of gravity has been recently formulated by Glavan

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