In order to clarify the effects of the finite distance from a lens object to a light source and a
receiver, the gravitational deflection of light has been recently reexamined by using the …

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 …

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 …

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 discuss a possible extension of calculations of the bending angle of light in a static,
spherically symmetric and asymptotically flat spacetime to a nonasymptotically flat case. We …

By using the Gauss-Bonnet theorem, the bending angle of light in a static, spherically
symmetric and asymptotically flat spacetime has been recently discussed, especially by …

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 propose a new method of detecting Ellis wormholes by use of the images of wormholes
surrounded by optically thin dust. First, we derive steady solutions of dust and a more …

Continuing work initiated in an earlier publication [A. Ishihara, Y. Suzuki, T. Ono, T. Kitamura,
and H. Asada, Phys. Rev. D 94, 084015 (2016). PRVDAQ 2470-0010 10.1103/PhysRevD …

This study explores the wormhole solutions utilizing the notion of conformal symmetry in the
background of the f (τ, T) f(τ,T) gravity. The exact shape functions are calculated using the …