In recent years, unprecedented progress has been achieved regarding black holes'
observation through the electromagnetic channel. The images of the supermassive black …

In this study, we review some current studies on gravitational lensing for black holes, mainly
in the context of general relativity. We mainly focus on the analytical studies related to …

Horizon-scale images of black holes (BHs) and their shadows have opened an
unprecedented window onto tests of gravity and fundamental physics in the strong-field …

In this paper, we discuss the effects of nonlinear electrodynamics (NED) on non-rotating
black holes, parametrized by the field coupling parameter β and magnetic charge parameter …

Motivated by recent work on the Modified Maxwell (ModMax) black holes [Phys Lett B
10.1016/j. physletb. 2020.136011], which are invariant in duality rotations and conformal …

Ultralight bosons can affect the dynamics of spinning black holes (BHs) via superradiant
instability, which can lead to a time evolution of the supermassive BH shadow. We study …

Abstract The Event Horizon Telescope (EHT) collaboration's image of the compact object at
the Galactic center is the first direct evidence of the supermassive black hole (BH) Sgr A …

The Event Horizon Telescope (EHT) collaboration has recently released the first image of a
black hole (BH), opening a new window onto tests of general relativity in the strong field …

Searching for violations of the no-hair theorem (NHT) is a powerful way to test gravity, and
more generally fundamental physics, particularly with regards to the existence of additional …

Recently, two types of static black hole models that retain general covariance have been
proposed within the Hamiltonian constraint approach to effective quantum gravity (EQG). We …