753 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Ahmedabad UniversityIN10 papers
- Sardar Patel UniversityIN8 papers
- Birla Institute of Technology and Science, Pilani - Goa CampusIN7 papers
- Jamia Millia IslamiaIN5 papers
- Sardar Vallabhbhai National Institute of Technology SuratIN5 papers
- L. N. Gumilyov Eurasian National UniversityKZ4 papers
- Tata Institute of Fundamental ResearchIN4 papers
- Shanghai Jiao Tong UniversityCN3 papers
- Yangzhou UniversityCN3 papers
- Birla Institute of Technology and Science, PilaniIN2 papers
- Center for Astrophysics Harvard & SmithsonianUS2 papers
- Chongqing UniversityCN2 papers
58 papers
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…
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…
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"…
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…
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…
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…
Cosmological singularities in non-canonical models of dark energy
Oem Trivedi, Simran Kaur Saggu, Pankaj S. Joshi
The pursuit of unraveling the true essence of dark energy has become an immensely captivating endeavor in modern cosmology. Alongside the conventional cosmological constant approac…
Cosmic acceleration with bulk viscosity in an anisotropic background
Raja Solanki, Bina Patel, Lakhan V. Jaybhaye +1
In this article, we investigate the observed cosmic acceleration in the framework of a cosmological model dominated by bulk viscous matter in an anisotropic background.…
Relativistic stellar modeling with perfect fluid core and anisotropic envelope fluid
A. C. Khunt, V. O. Thomas, P. C. Vinodkumar
We investigate the effect of density perturbations and local anisotropy on the stability of stellar matter structures in general relativity using the concept of cracking. Adopting…
Energy extraction from Janis-Newman-Winicour naked singularity
Vishva Patel, Kauntey Acharya, Parth Bambhaniya +1
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 ergoregion…
GALLIFRAY -- A geometric modeling and parameter estimation framework for black hole images using bayesian techniques
Saurabh, Sourabh Nampalliwar
Recent observations of the galactic centers of M87 and the Milky Way with the Event Horizon Telescope have ushered in a new era of black hole based tests of fundamental physics usi…
On the matrix function and its fractional calculus properties
Ravi Dwivedi, Reshma Sanjhira
The main objective of the present paper is to introduce and study the function with matrix parameters and investigate the convergence of this matrix function. The…
Light trajectory and shadow shape in the rotating naked singularity
Vishva Patel, Divya Tahelyani, Ashok B. Joshi +2
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- Jani…
Comparing thin accretion disk properties of naked singularities and black holes
Divya Tahelyani, Ashok B. Joshi, Dipanjan Dey +1
In the present paper, we study the thermal properties of the geometrically thin accretion disks surrounding the null naked singularity (NNS) and the first type of Joshi-Malafarina-…
Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A
Sunny Vagnozzi, Rittick Roy, Yu-Dai Tsai +12
Horizon-scale images of black holes (BHs) and their shadows have opened an unprecedented window onto tests of gravity and fundamental physics in the strong-field regime. We conside…
Lattice instability, anharmonicity and Raman spectra of BaO under high pressure: A first principles study
K. Lavanya, N. Yedukondalu, S. C. Rakesh Roshan +5
Alkaline-earth metal oxides, in particular MgO and CaO dominate Earths lower mantle, therefore, exploring high pressure behavior of this class of compounds is of significant geophy…
Shadows and precession of orbits in rotating Janis-Newman-Winicour spacetime
Divyesh N. Solanki, Parth Bambhaniya, Dipanjan Dey +2
In this paper, we construct the rotating Janis-Newman-Winicour (JNW) naked singularity spacetime using Newman-Janis Algorithm (NJA). We analyse NJA with and without complexificatio…
Thin accretion disk in the Simpson-Visser black-bounce and wormhole spacetimes
Parth Bambhaniya, Saurabh K, Kimet Jusufi +1
We compare the optical appearance of a thin accretion disk in the Simpson-Visser spacetime to the Schwarzschild black hole case in this paper. We calculate and illustrate the red-s…
Spontaneous symmetry breaking in the late Universe and glimpses of early Universe phase transitions à la baryogenesis
M. Sami, Radouane Gannouji
Spontaneous symmetry breaking is the foundation of electroweak unification and serves as an integral part of the model building beyond the standard model of particle physics and it…
Time-averaging axion-like interacting scalar fields models
Saikat Chakraborty, Esteban González, Genly Leon +1
In this paper, we study a cosmological model inspired in the axionic matter with two canonical scalar fields and interacting through a term added to its potential. Intr…
Late time acceleration due to generic modification of gravity and Hubble tension
Shahnawaz A. Adil, Mayukh R. Gangopadhyay, M. Sami +1
We consider a scenario of modified gravity, which is generic to late-time acceleration, namely, acceleration in the Jordan frame and no acceleration in the Einstein frame. The poss…
On the visibility of singularities in general relativity and modified gravity theories
Karim Mosani, Dipanjan Dey, Pankaj S. Joshi +3
We investigate the global causal structure of the end state of a spherically symmetric marginally bound Lemaitre-Tolman-Bondi (LTB) \cite{Lemaitre, Tolman, Bondi} collapsing cloud…
Causal Structure of Singularity in non-spherical Gravitational Collapse
Dipanjan Dey, Pankaj S. Joshi, Karim Mosani +1
We investigate here the final state of gravitational collapse of a non-spherical and non-marginally bound dust cloud as modeled by the Szekeres spacetime. We show that a directiona…
Globally visible singularity in an astrophysical setup
Karim Mosani, Dipanjan Dey, Pankaj S. Joshi
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-z…