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 …

Testing dynamical torsion effects on the charged black hole's shadow, deflection angle and greybody with M87* and Sgr. A* from EHT

RC Pantig, A Övgün - Annals of Physics, 2023 - Elsevier
Poincaré Gauge's theory of gravity is the most noteworthy alternative extension of general
relativity that has a correspondence between spin and spacetime geometry. In this paper …

Probing hairy black holes caused by gravitational decoupling using quasinormal modes and greybody bounds

Y Yang, D Liu, A Övgün, ZW Long, Z Xu - Physical Review D, 2023 - APS
Gravitational decoupling can add hair to the black holes by adding extra sources. The
quasinormal modes of a hairy black hole caused by gravitational decoupling for the …

Null geodesics and shadow of hairy black holes in Einstein-Maxwell-dilaton gravity

M Heydari-Fard, M Heydari-Fard, HR Sepangi - Physical Review D, 2022 - APS
The timelike and null-like geodesics around compact objects are some of the best tools to
classify and understand the structure of a space-time. We study the null geodesics around …

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

A Uniyal, S Chakrabarti, M Fathi, A Övgün - Annals of Physics, 2024 - Elsevier
This study explores spherically symmetric non-linear electrodynamics black holes and their
effects on light propagation. We derive the governing metric, revealing radial coordinate …

Superradiant instability of a charged regular black hole

SR Dolan, MAA de Paula, LCS Leite, LCB Crispino - Physical Review D, 2024 - APS
We show that a charged, massive scalar field in the vicinity of an electrically charged Ayón-
Beato–García (ABG) regular black hole has a spectrum of quasibound states that (in a …

[HTML][HTML] Some observable physical properties of the higher dimensional dS/AdS black holes in Einstein-bumblebee gravity theory

A Uniyal, S Kanzi, İ Sakallı - The European Physical Journal C, 2023 - Springer
We study the greybody factors, quasinormal modes, and shadow of the higher dimensional
de-Sitter (dS)/anti de-Sitter (AdS) black hole spacetimes derived from the Einstein …

Asymmetric wormholes in Palatini gravity: Energy conditions, absorption, and quasibound states

RB Magalhães, A Masó-Ferrando, GJ Olmo… - Physical Review D, 2023 - APS
We investigate the scalar absorption spectrum of wormhole solutions constructed via the
recently developed thin-shell formalism for Palatini f (R) gravity. Such wormholes come from …

Null geodesics and shadow of 4D Einstein–Gauss–Bonnet black holes surrounded by quintessence

M Heydari-Fard, M Heydari-Fard - International Journal of Modern …, 2022 - World Scientific
We study the properties of the null geodesics of four-dimensional Einstein–Gauss–Bonnet
(4D EGB) black holes surrounded by quintessence matter, recently derived by Shah et …