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

We give a brief review on the formation and the calculation of black hole shadows. Firstly,
we introduce the concept of a black hole shadow and the current works on a variety of black …

We consider a simple spherical model consisting of a Schwarzschild black hole of mass M
and a dark matter of mass ΔM around it. The general formula for the radius of black-hole …

The recent discovery of the novel four-dimensional static and spherically symmetric Gauss–
Bonnet black hole provides a promising bed to test Gauss–Bonnet gravity by using …

We investigate the gravitational lensing by spinning Proca stars and the shadows and
lensing by Kerr black holes (BHs) with synchronised Proca hair, discussing both theoretical …

We consider applications of the curvature radius of a Kerr black hole shadow and propose
three new approaches to simultaneously determine the black hole spin and inclination angle …

In this paper, we explore three simple models of accretions on a global monopole black hole
in f (R) theory, and numerically study the corresponding observational appearances as seen …

In this paper, under the illumination of thin disk accretion, we have employed the ray-tracing
method to carefully investigate shadows and rings of the Kehagias-Sfetsos (KS) black hole …

The relation between the black hole shadow and the black hole thermodynamics is
investigated. We find that the phase structure can be reflected by the shadow radius for the …

Unification of gravity with other interactions, achieving the ultimate framework of quantum
gravity, and fundamental problems in particle physics and cosmology motivate to consider …