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 …

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 …

In recent years there has been a growing interest in the field of Casimir wormhole. In
classical general relativity (GR), it is known that the null energy condition (NEC) has to be …

In this paper the deflection angle of light by a rotating Teo wormhole spacetime is calculated
in the weak limit approximation. We mainly focus on the weak deflection angle by revealing …

In this study, we found a new traversable wormhole solution in the framework of a
bumblebee gravity model. With these types of models, the Lorentz symmetry violation arises …

We study shadows cast by a certain class of rotating wormholes and point out the crucial
role of a rotating wormhole throat in the formation of a shadow. Overlooking this crucial role …

We investigate gravitational lensing by a primary photon sphere which is a sphere filled with
unstable circular light orbits, and by a secondary photon sphere on a wormhole throat in a …

In this paper, using the recent method proposed by Ono, Ishihara and Asada (OIA) who
extend the idea of Gibbons and Werner to the stationary and axisymmetric case, we apply …

A Simpson-Visser spacetime has two non-negative parameters a and m and its metric is
correspond with (i) a Schwarzschild metric for a= 0 and m≠ 0,(ii) a regular black hole metric …

The near future mm/sub-mm very long baseline interferometry experiments are ambitious
projects aiming at imaging the “shadow” of the supermassive black hole candidate at the …