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 …

Deriving weak deflection angle by black holes or wormholes usingGauss-Bonnet theorem

Y Kumaran, A Övgün - Turkish Journal of Physics, 2021 - journals.tubitak.gov.tr
In this review, various researches on finding the bending angle of light deflected by a
massive gravitating object which regard the Gauss-Bonnet theorem as the premise have …

Magnetically charged black holes from non-linear electrodynamics and the Event Horizon Telescope

A Allahyari, M Khodadi, S Vagnozzi… - Journal of Cosmology …, 2020 - iopscience.iop.org
Non-linear electrodynamics (NLED) theories are well-motivated extensions of QED in the
strong field regime, and have long been studied in the search for regular black hole (BH) …

Shadow cast and deflection of light by charged rotating regular black holes

R Kumar, SG Ghosh, A Wang - Physical Review D, 2019 - APS
We discuss the horizon properties, shadow cast, and the weak gravitational lensing of
charged rotating regular black holes, which in addition to mass (M) and rotation parameter …

Shadows and gravitational weak lensing by the Schwarzschild black hole in the string cloud background with quintessential field

G Mustafa, F Atamurotov, I Hussain… - Chinese …, 2022 - iopscience.iop.org
Shadows and gravitational weak lensing by the Schwarzschild black hole in the string cloud
background with quintessential field - IOPscience This site uses cookies. By continuing to use …

Dark matter effect on the weak deflection angle by black holes at the center of Milky Way and M87 galaxies

RC Pantig, A Övgün - The European Physical Journal C, 2022 - Springer
In this paper, we investigated the effect of dark matter on the weak deflection angle by black
holes at the galactic center. We consider three known dark matter density profiles such as …

Shadow cast and Deflection angle of Kerr-Newman-Kasuya spacetime

A Övgün, I Sakallı, J Saavedra - Journal of Cosmology and …, 2018 - iopscience.iop.org
We study the shadow cast or silhouette generated by a Kerr-Newman-Kasuya (KNK)
spacetime (rotating dyon black hole). It is shown that in addition to the angular momentum of …

Weak deflection angle and shadow cast by the charged-Kiselev black hole with cloud of strings in plasma

F Atamurotov, I Hussain, G Mustafa… - Chinese Physics C, 2023 - iopscience.iop.org
In this study, the gravitational deflection angle of photons in the weak field limit (or the weak
deflection angle) and shadow cast by the electrically charged and spherically symmetric …

Light deflection by Damour-Solodukhin wormholes and Gauss-Bonnet theorem

A Övgün - Physical Review D, 2018 - APS
In this paper, using the recent method proposed by Ono, Ishihara and Asada (OIA) who
extend the idea of Gibbons and Werner to the stationary and axisymmetric case, we apply …

Finite-distance gravitational deflection of massive particles by a Kerr-like black hole in the bumblebee gravity model

Z Li, A Övgün - Physical Review D, 2020 - APS
In this paper, we study the weak gravitational deflection angle of relativistic massive particles
by the Kerr-like black hole in the bumblebee gravity model. In particular, we focus on weak …