We study the propagation of charged scalar fields in the background of 2+ 1-dimensional
Coulomb-like AdS black holes, and we show that such propagation is unstable under …

Using numerical methods, we investigate the absorption properties of a family of
nonsingular solutions which arise in different metric-affine theories, such as quadratic and …

A bstract We study time evolutions of charged scalar perturbations on the background of a
charged hairy black hole, in which the perturbations can be governed by a double-peak …

Black holes possess trapping regions which lead to intriguing dynamical effects. By properly
scattering test fields off a black hole, one can extract energy from it, leading to the growth of …

Black holes typically inhabit highly dynamical galactic environments and are frequently
permeated by accretion media. The inevitable scattering of scalar, electromagnetic, and …

Q-balls are nontopological solitons that coherently rotate in field space. We show that these
coherent rotations can induce superradiance for scattering waves, thanks to the fact that the …

We investigate the scalar absorption spectrum of wormhole solutions constructed via the
recently developed thin-shell formalism for Palatini f (R) gravity. Such wormholes come from …

Along the last decades, several regular black hole (BH) solutions, ie, singularity-free BHs,
have been proposed and associated to nonlinear electrodynamics models minimally …

We study the instability of near extremal and extremal four-dimensional anti-de Sitter
charged hairy black holes to radial neutral massive and charged massless scalar field …

Recently, it has been realized that in some systems internal space rotation can induce
energy amplification for scattered waves, similar to rotation in real space. In particularly, it …