Horizon-scale images of black holes (BHs) and their shadows have opened an
unprecedented window onto tests of gravity and fundamental physics in the strong-field …

In this review, various researches on finding the bending angle of light deflected by a
massive gravitating object which regard the Gauss-Bonnet theorem as the premise have …

In this paper, we investigated the effect of dark matter on the weak deflection angle by black
holes at the galactic center. We consider three known dark matter density profiles such as …

Symmergent gravity is the R+ R 2 gravity theory which emerges in a way restoring gauge
symmetries broken explicitly by the ultraviolet cutoff in effective field theories. To test …

An analytical solution representing traversable asymptotically flat and symmetric wormholes
was obtained without adding exotic matter in two different theories independently: in the …

In this paper, we study light rays in a Kazakov–Solodukhin black hole. To this end, we use
the optical geometry of the Kazakov–Solodukhin black hole within the Gauss–Bonnet …

The accretion around the black hole plays a pivotal role in the theoretical analysis of black
hole shadow, and of the black hole observation in particular. We mainly study the shadow …

The objective of this paper is to analyze the weak deflection angle of Einstein-Gauss-Bonnet
gravity in the presence of plasma medium. To attain our results, we implement the Gibbons …

This article investigates Casimir wormhole solutions in Einstein Gauss–Bonnet (EGB)
gravity. We are familiar that Null energy conditions (NEC) need not be satisfied for a stable …

Wormholes (WHs) require negative energy, and therefore an exotic matter source. Since
Casimir energy is negative, it has been speculated as a good candidate to source those …