English
Related papers

Related papers: GRMHD Study of Accretion onto time-like Naked Sing…

200 papers

Can a naked singularity (NkS) be distinguished from a black hole (BH)? We have investigated it with cutting-edge general relativistic magneto-hydrodynamic (GRMHD) simulations, followed by general relativistic radiation transfer (GRRT)…

High Energy Astrophysical Phenomena · Physics 2024-10-21 Indu K. Dihingia , Akhil Uniyal , Yosuke Mizuno

We performed the first simulations of accretion onto the compact objects in the Reissner-Nordstr\"{o}m (RN) spacetime. The results obtained in general relativity are representative of those for spherically symmetric naked singularities and…

High Energy Astrophysical Phenomena · Physics 2024-08-19 Włodek Kluźniak , Tomasz Krajewski

Naked singularities are hypothetical astrophysical objects, characterized by a gravitational singularity without an event horizon. Penrose has proposed a conjecture, according to which there exists a cosmic censor who forbids the occurrence…

General Relativity and Quantum Cosmology · Physics 2011-01-17 Z. Kovacs , T. Harko

Nearly every galactic core contains a supermassive compact object, hypothesized to be a Kerr black hole. It was only with the advent of Event Horizon Telescope observations that the predictions of this hypothesis could be observationally…

High Energy Astrophysical Phenomena · Physics 2025-10-14 Tomasz Krajewski , Włodek Kluźniak

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-Narayan (JMN1) spacetimes and compare the results with the…

General Relativity and Quantum Cosmology · Physics 2022-08-31 Divya Tahelyani , Ashok B. Joshi , Dipanjan Dey , Pankaj S. Joshi

Accretion of magnetized gas on compact astrophysical objects such as black holes has been successfully modeled using general relativistic magnetohydrodynamic (GRMHD) simulations. These simulations have largely been performed in the Kerr…

High Energy Astrophysical Phenomena · Physics 2024-03-07 Prashant Kocherlakota , Ramesh Narayan , Koushik Chatterjee , Alejandro Cruz-Osorio , Yosuke Mizuno

We show that, in principle, a slowly evolving gravitationally collapsing perfect fluid cloud can asymptotically settle to a static spherically symmetric equilibrium configuration with a naked singularity at the center. We consider one such…

General Relativity and Quantum Cosmology · Physics 2015-06-15 Pankaj S. Joshi , Daniele Malafarina , Ramesh Narayan

We present the first three-dimensional general relativistic magnetohydrodynamic simulation of sustained accretion onto a horizonless singularity in which matter reaches the central object rather than being accumulated outside of it or…

High Energy Astrophysical Phenomena · Physics 2026-04-20 Saurabh , Maciek Wielgus , Parth Bambhaniya , Elisabete M. de Gouveia Dal Pino , Andrei P. Lobanov , Pankaj S. Joshi

We investigate here the thermal properties of accretion disks in a spacetime for some galactic density profiles in spherical symmetry. The matter distributions have a finite outer radius with a naked central singularity. The luminosities of…

General Relativity and Quantum Cosmology · Physics 2021-01-01 Jun-Qi Guo , Pankaj S. Joshi , Ramesh Narayan , Lin Zhang

General Relativistic Magnetohydrodynamics (GRMHD) simulations are an indispensable tool in studying accretion onto compact objects. The Event Horizon Telescope (EHT) frequently uses libraries of ideal GRMHD simulations to interpret…

High Energy Astrophysical Phenomena · Physics 2025-01-27 Vedant Dhruv , Ben Prather , George Wong , Charles F. Gammie

In this paper we study gravitational lensing in the strong field limit from the perspective of cosmic censorship, to investigate whether or not naked singularities, if at all they exist in nature, can be distinguished from black holes. We…

General Relativity and Quantum Cosmology · Physics 2012-09-21 Satyabrata Sahu , Mandar Patil , D. Narasimha , Pankaj S. Joshi

We first advance a mathematical novelty that the three geometrically and topologically distinct objects mentioned in the title can be exactly obtained from the Jordan frame vacuum Brans I solution by a combination of coordinate…

General Relativity and Quantum Cosmology · Physics 2020-12-29 R. Kh. Karimov , R. N. Izmailov , A. A. Potapov , K. K. Nandi

The possible existence of naked singularities, hypothetical astrophysical objects, characterized by a gravitational singularity without an event horizon is still an open problem in present day astrophysics. From an observational point of…

General Relativity and Quantum Cosmology · Physics 2024-11-18 Shahab Shahidi , Tiberiu Harko , Zoltán Kovács

We study here images of thin accretion disks around black holes and two classes of naked singularity spacetimes and compare these scenarios. The naked singularity models which have photon spheres have single accretion disk with its inner…

General Relativity and Quantum Cosmology · Physics 2019-11-14 Rajibul Shaikh , Pankaj S. Joshi

We study the optical appearance of a thin accretion disk around compact objects within the Einstein-Gauss-Bonnet gravity. Considering static spherically symmetric black holes and naked singularities we search for characteristic signatures…

General Relativity and Quantum Cosmology · Physics 2021-10-27 Galin Gyulchev , Petya Nedkova , Tsvetan Vetsov , Stoytcho Yazadjiev

We report on simulations in general relativity of magnetized disks onto black hole binaries. We vary the binary mass ratio from 1:1 to 1:10 and evolve the systems when they orbit near the binary-disk decoupling radius. We compare (surface)…

High Energy Astrophysical Phenomena · Physics 2015-06-18 Roman Gold , Vasileios Paschalidis , Zachariah B. Etienne , Stuart L. Shapiro , Harald P. Pfeiffer

We formulate a generic Newtonian like analogous potential for static spherically symmetric general relativistic (GR) spacetime, and subsequently derived proper Newtonian like analogous potential corresponding to Janis-Newman-Winicour (JNW)…

General Relativity and Quantum Cosmology · Physics 2015-11-09 Shubhrangshu Ghosh , Tamal Sarkar , Arunava Bhadra

Global, general relativistic magnetohydrodynamic (GRMHD) simulations of nonradiative, magnetized disks are widely used to model accreting black holes. We have performed a convergence study of GRMHD models computed with HARM3D. The models…

High Energy Astrophysical Phenomena · Physics 2015-06-03 Hotaka Shiokawa , Joshua C. Dolence , Charles F. Gammie , Scott C. Noble

We investigate here the particle acceleration by naked singularities to arbitrarily high center of mass energies. Recently it has been suggested that black holes could be used as particle accelerators to probe the Planck scale physics. We…

General Relativity and Quantum Cosmology · Physics 2010-12-23 Mandar Patil , Pankaj S. Joshi

We investigate the observational features of exact vacuum solutions in Brans-Dicke (BD) gravity, focusing on their implications for black hole shadow imaging. Motivated by the Event Horizon Telescope (EHT) observations, we revisit a class…

General Relativity and Quantum Cosmology · Physics 2025-09-17 Prajwal Hassan Puttasiddappa , Davi C Rodrigues , David F Mota
‹ Prev 1 2 3 10 Next ›