It is now known that when a massive star collapses under the force of its own gravity, the
final fate of such a continual gravitational collapse will be either a black hole or a naked …

Gravitational collapse is one of the most fruitful subjects in gravitational physics. It is well
known that singularity formation is inevitable in complete gravitational collapse. It was …

The global visibility of a singularity as an end state of the gravitational collapse of a
spherically symmetric pressureless cloud is investigated. We show the existence of a non …

In this paper, we investigate the topological photon sphere from two distinct perspectives. In
the first view, we examine the existence and characteristics of topological photon (anti …

In this paper, we investigate the light trajectories and shadow properties in the rotating
version of null naked singularity (NNS) spacetime which is derived using the Newman–Janis …

In general, energy extraction methods such as the Penrose process and the magnetic
Penrose process are thought to be reliant on the existence of an ergoregion. Inside an …

We investigate here the local versus global visibility of a spacetime singularity formed due to
the gravitational collapse of a spherically symmetric dust cloud having a nonzero velocity …

The source of Ultra-High Energy Cosmic Rays (UHECRs) remains one of the greatest
mysteries in astrophysics. Their possible source can be the galactic nuclei, where the ultra …

We have studied the dynamics of a cylindrical column of anisotropic, charged fluid which is
experiencing dissipation in the form of heat flow, free-streaming radiation, and shearing …

Abstract LeMaître-Tolman-Bondi models of spherical dust collapse have been used and
continue to be used extensively to study various stellar collapse scenarios. It is by now well …