Observational signatures: Shadow cast by the effective metric of photons for black holes with rational non-linear electrodynamics

Uniyal, Akhil; Chakrabarti, Sayan; Fathi, Mohsen; Övgün, Ali

doi:10.1016/j.aop.2024.169614

Cited by 5 publications

(1 citation statement)

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“…We can test GR by comparing the synthetic images produced by these libraries with the EHT observed images (Event Horizon Telescope Collaboration et al 2019cCollaboration et al , 2022c. A diverse work on the semianalytical model has also been studied to test the GR (e.g., Narayan et al 2019;Psaltis et al 2020;Kocherlakota et al 2021;Ayzenberg 2022;Bauer et al 2022;Ozel et al 2022;Uniyal et al 2023Uniyal et al , 2024Vagnozzi et al 2023;Younsi et al 2023;Jiang et al 2024b). However, further testing of the theory of gravity is needed to go beyond Kerr spacetime.…”

Section: Introductionmentioning

confidence: 99%

A Revisited Equilibrium Solution of the Fishbone and Moncrief Torus for Extended General Relativistic Magnetohydrodynamic Simulations

Uniyal,

Dihingia,

Mizuno

2024

ApJ

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Accretion physics has become more important recently due to the detection of the first horizon-scale images of the supermassive black holes of M 87* and Sgr A* by the Event Horizon Telescope. General relativistic magnetohydrodynamic (GRMHD) simulations of magnetized accretion flows onto a Kerr black hole have been used to interpret them. However, further testing the theory of gravity by using horizon-scale images requires performing consistent GRMHD simulations in non-Kerr spacetime. In this paper, we revisited the hydrodynamical equilibrium solution of the Fishbone and Moncrief (FM) torus that can be used to study any stationary, axisymmetric, vacuum, or nonvacuum spacetime. Further, we check the stability of the FM torus in non-Kerr spacetime by general relativistic hydrodynamic simulations. We find that FM torus in non-Kerr spacetime is indeed stable under long-term evolution. We conclude that the generalized FM torus solution would be very useful for creating new GRMHD libraries in extended Kerr black holes.

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