output
20162025
most citedHorizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A

753 citations

25 papers

gr-qc2025

Impact of Anisotropy on Neutron Star Structure and Curvature

A. C. Khunt, K. Yavuz Ekşi, P. C. Vinodkumar

We investigate the impact of pressure anisotropy on the structural and geometric properties of neutron stars within general relativity, focusing primarily on the phenomenological B…

gr-qc2025

Optical appearance of regularized compact objects without an exterior photon sphere

Ashok B. Joshi, Vishva Patel, Parth C. Varasani

Recent observations by the Event Horizon Telescope (EHT) indicate that the shadow of the compact object at our Galaxy's center (Sgr A*) closely resembles that of a Schwarzschild bl…

gr-qc2025

Thermodynamic Phase Transitions and Quantum Entropy Corrections in the Simpson-Visser Regular Black Hole

Vinayak Joshi, Ashok B. Joshi

Regular black holes offer a compelling framework to explore the consequences of resolving the central singularity of standard black holes. Using the Simpson-Visser ``black-bounce"…

gr-qc2025

Tidal disruption of a neutron star near naked singularity

Ashok B. Joshi, Pankaj S. Joshi, Sudip Bhattacharyya

We investigate the tidal disruption of a neutron star (NS) near a black hole (BH), and for the first time, to the best of our knowledge, near a naked singularity (NaS). For a BH wi…

gr-qc2024

Magnetic Penrose Process and Kerr Black Hole Mimickers

Divyesh P. Viththani, Tapobroto Bhanja, Vishva Patel +1

The present study investigates the negative energy orbits and energy extraction efficiency using the magnetic Penrose process in various regular black hole geometries surrounded by…

gr-qc2024★ 16 cited

Particle motion and tidal force in a non-vacuum-charged naked singularity

Divyesh P. Viththani, Ashok B. Joshi, Tapobroto Bhanja +1

In this article, we investigate the gravitational field of a charged, non-vacuum, non-rotating, spherically symmetric body of mass assuming a static solution to the Einstein-Ma…