In the last four decades, different programs have been carried out aiming at understanding
the final fate of gravitational collapse of massive bodies once some prescriptions for the …

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 …

The 0th order of affine perturbation series of the deflection angle of a ray near a photon
sphere is more accurate than a deflection angle in a strong deflection limit, which is used …

We investigate the affine perturbation series of the deflection angle of a ray near the photon
sphere of an extreme Reissner-Nordström black hole. We compare the 0th and 1st orders of …

The Hayward metric is a spherically symmetric charged regular black holes, a modification
of the Reisnner–Nordström black holes of Einstein's equations coupled to nonlinear …

We present an exact Hayward-like black hole solution in the 4D novel Einstein-Gauss-
Bonnet (EGB) gravity and also analyse their thermodynamic properties to calculate exact …

We briefly overview the basic properties and generic behavior of circular equatorial particle
orbits and light rings around regular rotating compact objects with dark energy interiors …

One of the most promising theories for modified gravity is the Einstein-Gauss-Bonnet (EGB)
gravity. In the framework of EGB gravity, we intend to compute the Hawking radiation of a 5 …

In light of the growing interest in the Hayward black hole solution, a detailed study on the
corresponding lapse function and its roots is presented. The lapse function is expressed in …