98 citations · 314 across the 13 of their papers we have counts for
13 papers
Causal Structure of Spacetime Singularities and Their Observable Signatures
Bina Patel, Jahnvi Mistry, Ayush Bidlan +1
We analyze the causal structure of horizonless compact objects via the light-cone geometry and conformal compactification of the Joshi-Malafarina-Narayan (JMN-1) and Janis-Newman-W…
Testing the Spacetime Geometry of Sgr A* with the Relativistic Orbit of S2 star
Parth Bambhaniya, Preet Dalal, Giovani H. Vicentin +3
In this work, we perform a relativistic test of the spacetime geometry of Sagittarius A* (Sgr A*) using the orbit of the S2 star. We consider a broad class of compact object models…
Gravitational Collapse and Singularity Formation in Brans-Dicke Gravity
Ayush Bidlan, Dipanjan Dey, Parth Bambhaniya
We investigate gravitational collapse driven solely by a self-interacting Brans--Dicke (BD) scalar field in the absence of ordinary matter. In this framework, the spacetime dynamic…
Influence of primary hair and plasma on intensity distribution of black hole shadows
Vitalii Vertogradov, Maxim Misyura, Parth Bambhaniya
In this paper, we investigate the influence of primary hair () on the shadows of hairy Schwarzschild and Reissner-Nordström black holes obtained through gravitational decoupling…
Relativistic orbits of S2 star in the presence of scalar field
Parth Bambhaniya, Ashok B. Joshi, Dipanjan Dey +4
The general theory of relativity predicts the relativistic effect in the orbital motions of S-stars which are orbiting around our Milky-way galactic center. The post-Newtonian or h…
Tidal force effects and periodic orbits in null naked singularity spacetime
Siddharth Madan, Parth Bambhaniya
Naked singularities form during the gravitational collapse of inhomogeneous matter clouds. The final nature of the singularity depends on the initial conditions of the matter prope…
Lense-Thirring effect and precession of timelike geodesics in slowly rotating black hole and naked singularity spacetimes
Parth Bambhaniya, Jay S. Verma, Dipanjan Dey +2
In this paper, we investigate the properties of the Lense-Thirring precession frequency and periastron precession of the relativistic bound orbits in slowly rotating naked singular…
Towards an observational test of black hole versus naked singularity at the galactic center
Dipanjan Dey, Pankaj S. Joshi, Ashok Joshi +1
While the event horizon of a black hole could cast a shadow that was observed recently, a central singularity without horizon could also give rise to such a feature. This leaves us…
Shadows and negative precession in non-Kerr spacetime
Parth Bambhaniya, Dipanjan Dey, Ashok B. Joshi +3
It is now known that the shadow is not only the property of a black hole, it can also be cast by other compact objects like naked singularities. However, there exist some novel fea…
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…
Timelike Geodesics in Naked Singularity and Black Hole Spacetimes II
Ashok B. Joshi, Parth Bambhaniya, Dipanjan Dey +1
We derive here the orbit equations of particles in naked singularity spacetimes, namely the Bertrand (BST) and Janis-Newman-Winicour (JNW) geometries, and for the Schwarzschild bla…
Timelike geodesics in Naked Singularity and Black Hole Spacetimes
Parth Bambhaniya, Ashok B. Joshi, Dipanjan Dey +1
In this paper, we derive the solutions of orbit equations for a class of naked singularity spacetimes, and compare these with timelike orbits, that is, particle trajectories in the…