753 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Charotar University of Science and TechnologyIN10 papers
- University of OklahomaUS10 papers
- National Research Nuclear University MEPhIRU9 papers
- Southern Federal UniversityRU9 papers
- Laboratoire AstroParticule et CosmologieFR7 papers
- Physical Research LaboratoryIN6 papers
- Jamia Millia IslamiaIN5 papers
- Fermi National Accelerator LaboratoryUS4 papers
- Indian Institute of Technology GandhinagarIN4 papers
- Vanderbilt UniversityUS4 papers
- Colorado State UniversityUS3 papers
- Durham UniversityGB3 papers
33 papers · 1 filter
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"…
Cosmology in the De Donder-Weyl Formulation of Einstein-Cartan Gravity
Aarav Shah, M. Yu. Khlopov, M. Krasnov
We investigate torsion-driven cosmological dynamics within the framework of Einstein-Cartan gravity using the De Donder-Weyl Hamiltonian formalism, where the tetrad and Lorentz con…
Quasinormal Ringing and Unruh-Verlinde Temperature of the Frolov Black Hole
Akshat Pathrikar
In this study, we investigate electromagnetic and Dirac test field perturbations of a charged regular black hole arising from quantum gravity effects, commonly referred to as the F…
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…
Could Planck Star Remnants be Dark Matter?
Oem Trivedi, Abraham Loeb
We explore the end state of gravitational collapse under quantum gravity effects and propose that Planck Star Remnants (PSR), formed via nonsingular bounces, could serve as viable…
Retrograde Precession of Relativistic Orbits and the Quest for Charged Black Holes
Parth Bambhaniya, Meet J. Vyas, Pankaj S. Joshi +1
The S-stars around the center of the milky way galaxy provide us with detailed information about the nature of the supermassive compact object Sagittarius A* (Sgr A*). In this work…
On Formation of Primordial Naked Singularities
Koushiki, Pankaj S. Joshi, Sudip Bhattacharyya
The density fluctuations in the nearly homogeneous background in the very early universe are argued to be the origin of the cosmic structures we observe in our present universe. Al…
Astrophysical Black holes: An Explanation for the Galaxy Quenching
Jay Verma Trivedi, Pankaj S. Joshi, Gopal-Krishna +1
In light of increasing observational evidence supporting the existence of ultra-compact objects, we adopt the term astrophysical black hole to refer to any object having a huge mas…
Rips and regular future scenario with Holographic Dark Energy: A comprehensive look
I. Brevik, Maxim Khlopov, S. D. Odintsov +2
Interest on the possible future scenarios the universe could have has grew substantially with breakthroughs on late-time acceleration. Holographic dark energy (HDE) presents a very…
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…
Fractional Holographic Dark Energy
Oem Trivedi, Ayush Bidlan, Paulo Moniz
Holographic dark energy theories present a fascinating interface to probe late-time cosmology, as guided by contemporary ideas about quantum gravity. In this work, we present a new…
Relativistic time delay analysis of pulsar signals near ultra-compact objects
Viraj Kalsariya, Parth Bambhaniya, Pankaj S. Joshi
The upcoming discoveries of pulsars orbiting the center of the Milky Way will present unparalleled opportunities to examine the causal structure of the spacetime geometry of Sagitt…
Tipler Naked Singularities in Dimensions
Kharanshu N. Solanki, Karim Mosani, Omkar Deshpande +1
A spacetime singularity, identified by the existence of incomplete causal geodesics in the spacetime, is called a (Tipler) strong curvature singularity if the volume form acting on…
Tsallis holographic dark energy with power law ansatz approach
Oem Trivedi, Maxim Khlopov, Alexander V. Timoshkin
Holographic principles have proven to be a very interesting approach towards dealing with the issues of the late-time acceleration of the universe, which has resulted in a great am…
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…
Primordial naked singularities
Pankaj S. Joshi, Sudip Bhattacharyya
Primordial black hole formation has been discussed widely, when density perturbations in the early universe cause matter to collapse gravitationally, giving rise to these ultra-com…
On rips and cosmological singularities in a universe merging with baby universes
Oem Trivedi, Maxim Khlopov
Understanding the late-time acceleration of the universe and its subtleties is one of the biggest mysteries in cosmology. A lot of different approaches have been put forward to dea…
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…
Cosmological singularities in gravity
Oem Trivedi, Maxim Khlopov, Jackson Levi Said +1
The pursuit of understanding the mysteries surrounding dark energy has sparked significant interest within the field of cosmology. While conventional approaches, such as the cosmol…
Joshi--Malafarina--Narayan singularity in weak magnetic field
Mustapha Azreg-Aïnou, Kauntey Acharya, Pankaj S. Joshi
The importance and significance of magnetic fields in the astrophysical scenario is well known. Many domains of astrophysical black hole physics such as polarized shadow image, hig…
Recent advances in cosmological singularities
Oem Trivedi
The discovery of universe's late-time acceleration and dark energy has overseen a great deal of research into cosmological singularities and in this brief review, we discuss all th…
Little Rip, Pseudo Rip and bounce cosmology with generalized equation of state in non-standard backgrounds
Oem Trivedi, Alexander V. Timoshkin
The discovery of universe's late-time acceleration and dark energy has overseen a great deal of research into cosmological singularities and particularly future singularities. Perh…
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…