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 …

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 …

Regular black holes (RBHs)—geometries free from curvature singularities—arise naturally
in theories of nonlinear electrodynamics. Here we study the absorption and superradiant …

We consider the propagation of a generic scalar field around a rotating and charged black
hole. Using the partial wave method, we find, numerically, the total and partial absorption …

We consider the effects of Weyl geometry on the propagation of electromagnetic wave
packets and on the gravitational spin Hall effect of light. It is usually assumed that in vacuum …

Tidal forces are an important feature of general relativity, which are related to the curvature
tensor. We analyze the tidal tensor in Kerr spacetime, with emphasis on the case along the …

The gray-body factor and the absorption cross section of the 4D ESTGB gravity with a mode
of nonlinear electrodynamics for the massless Dirac field are studied in this paper. The …

We study the scattering of light-like geodesics and massless scalar waves by a static
Konoplya–Zhidenko black hole, considering the case that the parametrized black hole …

Superradiance is a radiation enhancement process that involves dissipative systems. With a
60 year-old history, superradiance has played a prominent role in optics, quantum …

Black holes are among the most intriguing objects in nature. They are believed to be fully
described by General Relativity (GR), and the astrophysical black holes are expected to …