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 …

Strong gravitational lensing and shadow constraint from M87* of slowly rotating Kerr-like black hole

XM Kuang, A Övgün - Annals of Physics, 2022 - Elsevier
Motivated by (i) more and more interest in strong gravitational lensing by supermassive
black holes due to the achievement of EHT observations,(ii) the ongoing popular topic on …

Probing Schwarzschild-like black holes in metric-affine bumblebee gravity with accretion disk, deflection angle, greybody bounds, and neutrino propagation

G Lambiase, L Mastrototaro, RC Pantig… - Journal of Cosmology …, 2023 - iopscience.iop.org
In this paper, we investigate Schwarzschild-like black holes within the framework of metric-
affine bumblebee gravity. We explore the implications of such a gravitational setup on …

Exact traversable wormhole solution in bumblebee gravity

A Övgün, K Jusufi, İ Sakallı - Physical Review D, 2019 - APS
In this study, we found a new traversable wormhole solution in the framework of a
bumblebee gravity model. With these types of models, the Lorentz symmetry violation arises …

Exact Schwarzschild-like solution in a bumblebee gravity model

R Casana, A Cavalcante, FP Poulis, EB Santos - Physical Review D, 2018 - APS
We obtain an exact vacuum solution from the gravity sector contained in the minimal
standard-model extension. The theoretical model assumes a Riemann spacetime coupled to …

An exact stationary axisymmetric vacuum solution within a metric-affine bumblebee gravity

AA Araújo Filho, JR Nascimento… - Journal of Cosmology …, 2024 - iopscience.iop.org
Within the framework of the spontaneous Lorentz symmetry breaking (LSB), we consider a
metric-affine generalization of the gravitational sector of the Standard Model Extension …

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 …

Quasinormal modes and Hawking radiation sparsity of GUP corrected black holes in bumblebee gravity with topological defects

DJ Gogoi, UD Goswami - Journal of Cosmology and Astroparticle …, 2022 - iopscience.iop.org
We have obtained the Generalized Uncertainty Principle (GUP) corrected de Sitter and anti-
de Sitter black hole solutions in bumblebee gravity with a topological defect. We have …

Gravitational lensing under the effect of Weyl and bumblebee gravities: Applications of Gauss–Bonnet theorem

A Övgün, K Jusufi, İ Sakallı - Annals of Physics, 2018 - Elsevier
In this paper, we use the Gauss–Bonnet theorem to obtain the deflection angle by the
photons coupled to Weyl tensor in a Schwarzschild black hole and Schwarzschild-like black …

Vacuum solution within a metric-affine bumblebee gravity

AAA Filho, JR Nascimento, AY Petrov, PJ Porfírio - Physical Review D, 2023 - APS
We consider a metric-affine extension to the gravitational sector of the Standard Model
extension for the Lorentz-violating coefficients u and s μ ν. The general results, which are …