19 papers
Quasinormal Modes and Hawking Radiation of Black Holes with Primary Scalar Hair
Roman Konoplya, Oleksandr Stashko, ZdenÄk StuchlÃk
Recently, a new family of asymptotically flat black-hole solutions endowed with primary scalar hair has been discovered in beyond-Horndeski gravity. We study in detail the quasinor…
Cesà ro convergence of the high-order WKB method and its applications to black-hole overtones and long-lived modes
Roman A. Konoplya, Jerzy Matyjasek, Alexander Zhidenko
We develop a fully automatic Mathematica implementation of the black-hole WKB method at very high orders based on the Bender-Wu algorithm, which in principle is limited only by mem…
An efficient higher-order WKB code for quasinormal modes and greybody factors
Roman A. Konoplya, Jerzy Matyjasek, Alexander Zhidenko
The higher-order WKB Mathematica code for computing quasinormal modes, whose accuracy was significantly enhanced through extensions to higher orders and, in particular, through the…
Quasinormal modes of four-dimensional regular black holes in quasi-topological gravity: Overtones' outburst via WKB method
R. A. Konoplya
We study quasinormal modes of scalar, electromagnetic, and Dirac perturbations of four-dimensional regular black holes arising in non-polynomial quasi-topological gravity. Starting…
Dirty Black Holes, Clean Signals: Near-Horizon vs. Environmental Effects on Grey-Body Factors and Hawking Radiation
Roman A. Konoplya, Thomas D. Pappas
Grey-body factors are not only essential ingredients for computing the intensity of Hawking radiation, but also serve as characteristics of black hole's geometry that are closely r…
Dark matter halo as a source of regular black-hole geometries
R. A. Konoplya, A. Zhidenko
We construct exact black hole solutions free of curvature singularities, sourced by dark matter halos described by galactic density profiles. Regularity of the geometry is ensured…