Mimetic gravity is a Weyl‐symmetric extension of General Relativity, related to the latter by a
singular disformal transformation, wherein the appearance of a dust‐like perfect fluid can …

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 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 work, we propose the modeling of static wormholes within the f (R, T) extended theory
of gravity perspective. We present some models of wormholes, which are constructed from …

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 …

Wormholes are hypothetical topologically-non-trivial structures of spacetime. From the
theoretical point of view, the possibility of their existence is challenging but cannot be ruled …

We investigate the equatorial deflection angle of light rays propagating in Kerr-Newman
black-bounce spacetime. Furthermore, we analyze the light ray trajectories and derive a …