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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…
No stable wormholes in Einstein-dilaton-Gauss-Bonnet theory
M. A. Cuyubamba, R. A. Konoplya, A. Zhidenko
In [P. Kanti, B. Kleihaus, J. Kunz, Phys. Rev. Lett. 107, 271101 (2011)] it was shown that the four-dimensional Einstein-dilaton-Gauss-Bonnet theory allows for wormholes without in…
Axisymmetric black holes allowing for separation of variables in the Klein-Gordon and Hamilton-Jacobi equation
R. A. Konoplya, Z. Stuchlík, A. Zhidenko
We determine the class of axisymmetric and asymptotically flat black-hole spacetimes for which the test Klein-Gordon and Hamilton-Jacobi equations allow for the separation of varia…