98 citations · 241 across the 15 of their papers we have counts for
6 papers · 1 filter
Shadow of nulllike and timelike naked singularities without photon spheres
Dipanjan Dey, Rajibul Shaikh, Pankaj S. Joshi
In this paper, we derive general conditions for a shadow to occur, without a photon sphere in a spacetime, caused by central nulllike or timelike naked singularities. Using these c…
Precession of timelike bound orbits in Kerr spacetime
Parth Bambhaniya, Divyesh N. Solanki, Dipanjan Dey +3
Astrometric observations of S-stars provide a unique opportunity to probe the nature of Sagittarius-A* (Sgr-A*). In view of this, it has become important to understand the nature a…
Shadow of a Naked Singularity without Photon Sphere
Ashok B. Joshi, Dipanjan Dey, Pankaj S. Joshi +1
It is generally believed that the shadows of either a black hole or naked singularity arise due to photon spheres developing in these spacetimes. Here we propose a new spherically…
Perihelion Precession and Shadows near Blackholes and Naked Singularities
Dipanjan Dey, Rajibul Shaikh, Pankaj S. Joshi
It is now known that, apart from black holes, some naked singularities can also cast shadows which provide their possible observable signatures. We examine the relevant question he…
Strong curvature naked singularities in spherically symmetric perfect fluid collapse
Karim Mosani, Dipanjan Dey, Pankaj S. Joshi
We investigate here the locally naked singularity formed due to a spherically symmetric inhomogeneous collapsing cloud having non-zero isotropic pressure, in terms of its strength.…
Global visibility of a strong curvature singularity in nonmarginally bound dust collapse
Karim Mosani, Dipanjan Dey, Pankaj S. Joshi
We investigate here the local versus global visibility of a space-time singularity formed due to the gravitational collapse of a spherically symmetric dust cloud having a non-zero…