51 citations · 128 across the 44 of their papers we have counts for
49 papers
Simpson-Visser regularization of the quantum Oppenheimer-Snyder-Datt black hole
Faizuddin Ahmed, Ahmad Al-Badawi, İzzet Sakallı
We study the spherical geometry from the Simpson-Visser prescription to the quantum Oppenheimer-Snyder-Datt (qOSD) black hole of loop quantum cosmology, whose…
Geodesics and thermodynamics of a -deformed anti-de Sitter black hole surrounded by a quintessence field
Faizuddin Ahmed, Ahmad Al-Badawi, Izzet Sakalli +1
We investigate the geodesic structure and thermodynamics of a -deformed Schwarzschild-anti-de Sitter black hole in a Kiselev quintessence field, where dynamics are governed by a…
An exact dyonic black hole at the integrable locus of quadratic nonlinear electrodynamics
Faizuddin Ahmed, Ahmad Al-Badawi, Izzet Sakalli
We obtain an exact dyonic black-hole solution in quadratic nonlinear electrodynamics defined by on the special locus . At this locus, the radial dependenc…
MCMC Constraints on Dyonic Kalb-Ramond Black Holes with a Cloud of Strings from Twin-Peak QPOs and EHT Shadows
Faizuddin Ahmed, Ahmad Al-Badawi, İzzet Sakallı
We study a dyonic black hole in a Lorentz-violating gravity that carries a background Kalb--Ramond field and is pierced by a cloud of strings. The resulting metric reduces to the r…
Are Petrov type-N and D spacetimes admitting CTCs valid in gravity?
Faizuddin Ahmed, Ahmad Al-Badawi, İzzet Sakallı
We ask whether two classical time-machine geometries, the Ori (2005) compact-vacuum-core metric and the Ahmed (2018) four-dimensional generalisation of Misner space, remain admissi…
Astrophysical signatures of Kerr-Bertotti-Robinson black holes in a cloud of strings: ISCO, microquasar QPOs, and Bondi-Hoyle-Lyttleton accretion
Faizuddin Ahmed, Orhan Donmez, Ahmad Al-Badawi +1
We study test-particle dynamics in the equatorial plane of a Kerr-Bertotti-Robinson black hole (BH) immersed in a cloud of strings (CS), with mass M , rotation a, magnetic paramete…
Astrophysical Signatures of Einstein-Skyrme Anti-de Sitter Black Holes: Epicyclic Frequencies and QPO Constraints
Faizuddin Ahmed, Ahmad Al-Badawi, İzzet Sakallı
We study the geodesic motion and epicyclic oscillations of massive test particles around a static, spherically symmetric black hole (BH) solution of the Einstein--Skyrme (ES) theor…
Spin-(, , ) Field Perturbations, Quasinormal Modes, Overtones, Greybody Factors and Strong Cosmic Censorship of Einstein-Skyrme Black Holes
Faizuddin Ahmed, Ahmad Al-Badawi, İzzet Sakallı
We carry out a multi-spin perturbation-theory study of the four-dimensional Einstein-Skyrme (ES) anti-de Sitter (AdS) black hole (BH), whose lapse inhe…
Shadow, Sparsity of Radiation and Energy Emission Rate in Skyrmion Black Holes
Faizuddin Ahmed, Ahmad Al-Badawi, İzzet Sakallı
We examine several observable optical properties of a Skyrmion black hole (BH), focusing on the photon sphere, BH shadow, and photon trajectories. The Skyrme term, along with other…
Renormalization-group improved Schwarzschild black hole: shadow, ringdown, and strong cosmic censorship
Ahmad Al-Badawi, Faizuddin Ahmed, İzzet Sakallı
A renormalization-group (RG) improved Schwarzschild-like black hole (BH) is studied here, with a lapse that interpolates between a classical Schwarzschild exterior and a quantum-sm…
Plummer Dark Matter Black Hole with Topological Defects: Shadow, Greybody Factors, Quasinormal Modes, and Thermodynamics
Ahmad Al-Badawi, Faizuddin Ahmed, İzzet Sakallı
We construct a static, spherically symmetric black hole (BH) solution embedded in a cored Plummer dark matter (DM) halo and a Letelier cloud of strings (CoS). Starting from the Plu…
Observational imprints and quasi-Periodic oscillations of magnetically charged anti-de Sitter black holes
Faizuddin Ahmed, Mohsen Fathi, Ahmad Al-Badawi
In this work, we investigate observable signatures of a magnetically charged Anti-de Sitter black hole in string-inspired Euler-Heisenberg theory. We analyze photon trajectories, t…
Thermodynamics and Optical Properties of Charged Black Holes in Bumblebee gravity Sourced by a Cloud of Strings
Faizuddin Ahmed, Shubham Kala, Ahmad Al-Badawi
In theories where the Lorentz symmetry of gravity is spontaneously broken, a non-minimally coupled bumblebee vector field acquires a nonzero vacuum expectation value, leading to mo…
Shadow and Thermodynamics of deformed Schwarzschild-AdS black hole with a Cloud of Strings embedded in Perfect Fluid Dark Matter
Faizuddin Ahmed, Carlos E. Romero-Figueroa, Hernando Quevedo
We investigate the optical and thermodynamic properties of a deformed Schwarzschild Anti-de Sitter (AdS) black hole coupled to a cloud of strings and embedded in perfect fluid dark…
-- criticality, Joule--Thomson expansion, and holographic heat engine of charged Hayward-AdS black holes with a cloud of strings and perfect fluid dark matter
Ahmad Al-Badawi, Faizuddin Ahmed, İzzet Sakallı
We construct the charged Hayward-anti-de Sitter (AdS) black hole (BH) with a cloud of strings (CS) and perfect fluid dark matter (PFDM), and analyze its extended thermodynamic phas…
Probing the Charged Hayward Black Hole in Dark Matter and String Cloud Environments through Shadow, Geodesics, and Quasinormal Spectrum
Faizuddin Ahmed, Ahmad Al-Badawi, İzzet Sakallı
We construct a charged Bardeen black hole (BH) surrounded by perfect fluid dark matter (PFDM) and coupled to a cloud of strings (CS). The metric function combines the magnetic mono…
Observational signatures of charged Bardeen black holes in perfect fluid dark matter with a cloud of strings
Faizuddin Ahmed, Ahmad Al-Badawi, İzzet Sakallı
We construct a charged Bardeen black hole (BH) surrounded by perfect fluid dark matter (PFDM) and coupled to a cloud of strings (CS). The metric function combines the magnetic mono…
Effects of spontaneous Lorentz Symmetry breaking on Letelier-AdS charged black holes within Kalb-Ramond gravity
Faizuddin Ahmed, Ahmad Al-Badawi, İzzet Sakallı
In this study, we investigate the geodesic motion of massless particles -- specifically photons -- in the spacetime of a charged anti-de Sitter (AdS) black hole (BH) surrounded by…
Charged Simpson-Visser AdS Black Holes: Geodesic Structure and Thermodynamic Properties
Faizuddin Ahmed, Ahmad Al-Badawi, Mohsen Fathi
In this article, we apply the Simpson-Visser (SV) regularization scheme to Anti-de Sitter (AdS) charged black holes and investigate the resulting spacetime geometry in detail, with…
Optical appearance, Hawking radiation, and Barrow thermodynamics of Letelier black hole in electromagnetic universe
İzzet Sakallı, Erdem Sucu, Ahmad Al-Badawi +1
We present an investigation of a static, spherically symmetric Letelier black hole (BH) immersed in an electromagnetic universe (EMU), characterized by the cloud of strings (CoS) p…
Letelier black hole immersed in an electromagnetic universe
Ahmad Al-Badawi, Faizuddin Ahmed, İzzet Sakallı
We investigate a static, spherically symmetric black hole solution surrounded by a cloud of strings and immersed in an electromagnetic universe. By deriving the event horizon from…
Comment on "Black hole in Dehnen dark matter halo: exact solution, lensing, light ring, and thermodynamics (EPJC 85 (2025) 1256)"
Ahmad Al-Badawi, Faizuddin Ahmed, İzzet Sakallı
In a recent article, the author of Ref. [EPJC 85 (2025) 1256] constructed an exact solution describing a static, spherically symmetric black hole embedded in a Dehnen-() t…
Kerr-Bertotti-Robinson Black Holes Surrounded by a Cloud of Strings
Faizuddin Ahmed, İzzet Sakallı, Ahmad Al-Badawi
In a recent study [1], authors introduced a new class of exact space-times in Einstein's gravity, which are Kerr black holes immersed in an external uniform magnetic field that is…
Spherically Symmetric Quantum-Corrected Black Holes with String Clouds: A Multi-Observable Analysis
Faizuddin Ahmed, Ahmad Al-Badaw, Orhan Donmez +4
We present an investigation of quantum-corrected black hole spacetimes coupled with clouds of strings, examining two distinct theoretical models that incorporate quantum gravitatio…