The Cosmic-Ray Extremely Distributed Observatory (CREDO) is a newly formed, global
collaboration dedicated to observing and studying cosmic rays (CR) and cosmic-ray …

We present a review of the influence of cosmic repulsion and external magnetic fields on
accretion disks rotating around rotating black holes and on jets associated with these …

The work reviews the investigation of electromagnetic, optical, and energetic properties of
astrophysical and galactic black holes and surrounding matter. The astrophysical …

We present a review of the Penrose process and its modifications in relation to the Kerr
black holes and naked singularities (superspinars). We introduce the standard variant of this …

We consider accretion of charged test matter by rotating, magnetic black holes and discuss a
number of aspects in which the interaction of the angular momentum contained in the …

By exploiting the extreme environment of the black hole (BH) as a potential place for axion-
photon interaction, we use an axion-producing model of the magnetized plasma to study the …

In this paper, we investigate the Penrose process in the purlieus of the axially symmetric
magnetized Reissner-Nordström black hole for both neutral and charged particles. We start …

The study of charged particle dynamics in the combined gravitational and magnetic field can
provide important theoretical insight into astrophysical processes around black holes. In this …

In many astrophysical scenarios the charge of the black hole is often neglected due to
unrealistically large values of the charge required for the Reissner-Nordström spacetime …

We demonstrate an extraordinary effect of energy gain by a single radiating charged particle
inside the ergosphere of a Kerr black hole in presence of magnetic field. We solve …