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 …

We investigate retrolensing by two photon spheres in a novel black-bounce spacetime
suggested by Lobo et al. which can correspond to a Schwarzschild black hole, a regular …

We investigate strong field gravitational lensing by rotating Simpson-Visser black hole,
which has an additional parameter (0≤ l/2M≤ 1), apart from mass (M) and rotation …

In the present work, we theoretically investigate gravitational lensing in the spacetime of a
holonomy corrected Schwarzschild black hole. Analytical expressions for the light deflection …

Gravitational lensing by the light sphere of compact objects like black holes and wormholes
will give us information on the compact objects. In this paper, we provide an improved strong …

In this work, we calculate the deflection angle of light in a spacetime that interpolates
between regular black holes and traversable wormholes, depending on the free parameter …

We investigate gravitational lensing by a photon sphere in a Reissner-Nordström naked
singularity spacetime in strong deflection limits. Because of the nonexistence of an event …

In the present paper, we study several aspects of gravitational lensing caused by a
topologically charged Monopole/Wormhole, both in the weak field limit and in the strong field …