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The portrait of eikonal instability in Lovelock theories
R. A. Konoplya, A. Zhidenko
Perturbations and eikonal instabilities of black holes and branes in the Einstein-Gauss-Bonnet theory and its Lovelock generalization were considered in the literature for several…
Quasinormal modes of Gauss-Bonnet-AdS black holes: towards holographic description of finite coupling
R. A. Konoplya, A. Zhidenko
Here we shall show that there is no other instability for the Einstein-Gauss-Bonnet-anti-de Sitter (AdS) black holes, than the eikonal one and consider the features of the quasinor…
Eikonal instability of Gauss-Bonnet-(anti-)de Sitter black holes
R. A. Konoplya, A. Zhidenko
Here we have shown that asymptotically anti-de Sitter (AdS) black holes in the Einstein-Gauss-Bonnet (GB) theory are unstable under linear perturbations of spacetime in some region…
Charged scalar field instability between the event and cosmological horizons
R. A. Konoplya, A. Zhidenko
Recently, a new interesting instability of a charged scalar field in the Reissner-Nordström-de Sitter background has been found (arXiv:1405.4931v2) through the time-domain integrat…
Instability of D-dimensional extremally charged Reissner-Nordstrom(-de Sitter) black holes: Extrapolation to arbitrary D
R. A. Konoplya, A. Zhidenko
In our earlier work (PRL 103 (2009) 161101) it was shown that nonextremal highly charged Reissner-Nordstrom-de Sitter black holes are gravitationally unstable in D>6-dimensional sp…
Stability of tardyons and tachyons in the rotating and expanding Universe
R. A. Konoplya, A. Zhidenko
In the present paper we analyze the spectrum of quasinormal modes for massive scalar and Dirac fields, allowing for both tardyonic () and tachyonic () masses, in th…