21 citations · 21 across the 1 of their papers we have counts for
5 papers
General parametrization of higher-dimensional black holes and its application to Einstein-Lovelock theory
Roman A. Konoplya, Thomas D. Pappas, Zdenek Stuchlík
Here we have developed the general parametrization for spherically symmetric and asymptotically flat black-hole spacetimes in an arbitrary metric theory of gravity. The parametriza…
Dynamical instability of polytropic spheres in spacetimes with a cosmological constant
Camilo Posada, Jan Hladík, Zdenek Stuchlík
The dynamical instability of relativistic polytropic spheres, embedded in a spacetime with a repulsive cosmological constant, is studied in the framework of general relativity. We…
Stable Schwarzschild stars as black-hole mimickers
R. A. Konoplya, C. Posada, Z. Stuchlík +1
The Schwarzschild star is an ultracompact object beyond the Buchdahl limit, which has Schwarzschild geometry outside its surface and positive pressure in the external layer which v…
Echoes of compact objects: new physics near the surface and matter at a distance
R. A. Konoplya, Z. Stuchlík, A. Zhidenko
It is well known that a hypothetical compact object that looks like an Einsteinian (Schwarzschild or Kerr) black hole everywhere except a small region near its surface should have…
Massive nonminimally coupled scalar field in Reissner-Nordström spacetime: Long-lived quasinormal modes and instability
R. A. Konoplya, Z. Stuchlík, A. Zhidenko
Here we show that the phenomenon of arbitrarily long-lived quasinormal modes (called quasiresonances) of a massive scalar field in the vicinity of a black hole is not an artifact o…