Shadows and strong gravitational lensing: a brief review

PVP Cunha, CAR Herdeiro - General Relativity and Gravitation, 2018 - Springer
For ultra compact objects, light rings and fundamental photon orbits (FPOs) play a pivotal
role in the theoretical analysis of strong gravitational lensing effects, and of BH shadows in …

Testing black hole candidates with electromagnetic radiation

C Bambi - Reviews of Modern Physics, 2017 - APS
Astrophysical black hole candidates are thought to be the Kerr black holes of general
relativity, but there is not yet direct observational evidence that the spacetime geometry …

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

S Vagnozzi, R Roy, YD Tsai, L Visinelli… - … and Quantum Gravity, 2023 - iopscience.iop.org
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 …

Dynamic study of multi-peak solitons and other wave solutions of new coupled KdV and new coupled Zakharov–Kuznetsov systems with their stability

J Wang, K Shehzad, AR Seadawy… - Journal of Taibah …, 2023 - Taylor & Francis
In this paper, our aim is to further expand the use of the two-variable (G′/G, 1/G)-expansion
approach to a new coupled KdV and ZK system, which has various significant applications …

Nonlinear electrodynamics effects on the black hole shadow, deflection angle, quasinormal modes and greybody factors

M Okyay, A Övgün - Journal of Cosmology and Astroparticle …, 2022 - iopscience.iop.org
In this paper, we discuss the effects of nonlinear electrodynamics (NED) on non-rotating
black holes, parametrized by the field coupling parameter β and magnetic charge parameter …

[HTML][HTML] Shadow, lensing, quasinormal modes, greybody bounds and neutrino propagation by dyonic ModMax black holes

RC Pantig, L Mastrototaro, G Lambiase… - The European Physical …, 2022 - Springer
Motivated by recent work on the Modified Maxwell (ModMax) black holes [Phys Lett B
10.1016/j. physletb. 2020.136011], which are invariant in duality rotations and conformal …

Probing a non-linear electrodynamics black hole with thin accretion disk, shadow, and deflection angle with M87* and Sgr A* from EHT

A Uniyal, RC Pantig, A Övgün - Physics of the Dark Universe, 2023 - Elsevier
Non-linear interaction between the electromagnetic fields (EMF) occurs when vacuum
polarization in quantum electrodynamics (QED) happens. The field of non-linear …

Parameter estimation of hairy Kerr black holes from its shadow and constraints from M87

M Afrin, R Kumar, SG Ghosh - Monthly Notices of the Royal …, 2021 - academic.oup.com
The recently obtained hairy Kerr black holes, due to additional sources or surrounding fluid,
like dark matter, with conserved energy-momentum tensor, have a deviation α and primary …

Tests of loop quantum gravity from the event horizon telescope results of Sgr A

M Afrin, S Vagnozzi, SG Ghosh - The Astrophysical Journal, 2023 - iopscience.iop.org
Abstract The Event Horizon Telescope (EHT) collaboration's image of the compact object at
the Galactic center is the first direct evidence of the supermassive black hole (BH) Sgr A …

Rotating black holes in 4D Einstein-Gauss-Bonnet gravity and its shadow

R Kumar, SG Ghosh - Journal of Cosmology and Astroparticle …, 2020 - iopscience.iop.org
Recently there has been a surge of interest in regularizing, a D→ 4 limit of, the Einstein-
Gauss-Bonnet (EGB) gravity, and the resulting regularized 4D EGB gravity has nontrivial …