Faizuddin Ahmed

activity

20242026

most citedGravitational Lensing Phenomena of Ellis-Bronnikov-Morris-Thorne Wormhole with Global Monopole and Cosmic String

51 citations · 128 across the 44 of their papers we have counts for

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gr-qc2026

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 $r \to r^{2} + a^{2}$ to the quantum Oppenheimer-Snyder-Datt (qOSD) black hole of loop quantum cosmology, whose…

gr-qc2026

Geodesics and thermodynamics of a $κ$ -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 $κ$ -deformed Schwarzschild-anti-de Sitter black hole in a Kiselev quintessence field, where dynamics are governed by a…

gr-qc2026

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 $- F + a F^{2} + b G^{2}$ on the special locus $b = a /2$ . At this locus, the radial dependenc…

gr-qc2026

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…

gr-qc2026

Are Petrov type-N and D spacetimes admitting CTCs valid in $f (R, L_{m}, Φ, X)$ 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…

gr-qc2026

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…

gr-qc2026

Spin-( $0$ , $1$ , $\frac{1}{2}$ ) 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 $f (r) = 1 - 8 π K - 2 M / r + 4 π K λ / r^{2}$ inhe…

gr-qc2026

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…

gr-qc2026

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…

gr-qc2026

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…

gr-qc2026

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…

gr-qc2026

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…

gr-qc2026

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…

gr-qc2026

$P$ -- $V$ 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…

gr-qc2026

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…

gr-qc2026

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…

gr-qc2026

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…

gr-qc2026★ 1 cited

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…

gr-qc2025

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…

gr-qc2025

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…

gr-qc2025

Comment on "Black hole in Dehnen $(1, 4, \frac{1}{2})$ 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-( $α, β, γ$ ) t…

gr-qc2025

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…

gr-qc2025

Letelier-AdS Black Hole Surrounded by a Perfect Fluid Dark Matter in the presence of Quintessence

Faizuddin Ahmed, Edilberto O. Silva

This study investigates a Schwarzschild-anti de Sitter black hole coupled to a cloud of strings featuring only the electric-like component of the string bivector, embedded in a per…

gr-qc2025

Gravitational Lensing and Topological Photon Sphere of Holonomy Corrected Schwarzschild Black Hole with a Cloud of Strings

Faizuddin Ahmed, Shubham Kala

In this paper, we theoretically investigate the deflection of light, lensing equations, topological properties of photon rings, and accretion disk characteristics in the spacetime…

Simpson-Visser regularization of the quantum Oppenheimer-Snyder-Datt black hole

Geodesics and thermodynamics of a κ-deformed anti-de Sitter black hole surrounded by a quintessence field

An exact dyonic black hole at the integrable locus of quadratic nonlinear electrodynamics

MCMC Constraints on Dyonic Kalb-Ramond Black Holes with a Cloud of Strings from Twin-Peak QPOs and EHT Shadows

Are Petrov type-N and D spacetimes admitting CTCs valid in f(R,Lm​,Φ,X) gravity?

Astrophysical Signatures of Einstein-Skyrme Anti-de Sitter Black Holes: Epicyclic Frequencies and QPO Constraints

Spin-(0, 1, 21​) Field Perturbations, Quasinormal Modes, Overtones, Greybody Factors and Strong Cosmic Censorship of Einstein-Skyrme Black Holes

Shadow, Sparsity of Radiation and Energy Emission Rate in Skyrmion Black Holes

Renormalization-group improved Schwarzschild black hole: shadow, ringdown, and strong cosmic censorship

Plummer Dark Matter Black Hole with Topological Defects: Shadow, Greybody Factors, Quasinormal Modes, and Thermodynamics

Observational imprints and quasi-Periodic oscillations of magnetically charged anti-de Sitter black holes

Thermodynamics and Optical Properties of Charged Black Holes in Bumblebee gravity Sourced by a Cloud of Strings

Shadow and Thermodynamics of deformed Schwarzschild-AdS black hole with a Cloud of Strings embedded in Perfect Fluid Dark Matter

P--V criticality, Joule--Thomson expansion, and holographic heat engine of charged Hayward-AdS black holes with a cloud of strings and perfect fluid dark matter

Probing the Charged Hayward Black Hole in Dark Matter and String Cloud Environments through Shadow, Geodesics, and Quasinormal Spectrum

Observational signatures of charged Bardeen black holes in perfect fluid dark matter with a cloud of strings

Effects of spontaneous Lorentz Symmetry breaking on Letelier-AdS charged black holes within Kalb-Ramond gravity

Charged Simpson-Visser AdS Black Holes: Geodesic Structure and Thermodynamic Properties

Optical appearance, Hawking radiation, and Barrow thermodynamics of Letelier black hole in electromagnetic universe

Letelier black hole immersed in an electromagnetic universe

Comment on "Black hole in Dehnen (1,4,21​) dark matter halo: exact solution, lensing, light ring, and thermodynamics (EPJC 85 (2025) 1256)"

Kerr-Bertotti-Robinson Black Holes Surrounded by a Cloud of Strings

Letelier-AdS Black Hole Surrounded by a Perfect Fluid Dark Matter in the presence of Quintessence

Gravitational Lensing and Topological Photon Sphere of Holonomy Corrected Schwarzschild Black Hole with a Cloud of Strings

Geodesics and thermodynamics of a $κ$ -deformed anti-de Sitter black hole surrounded by a quintessence field

Are Petrov type-N and D spacetimes admitting CTCs valid in $f (R, L_{m}, Φ, X)$ gravity?

Spin-( $0$ , $1$ , $\frac{1}{2}$ ) Field Perturbations, Quasinormal Modes, Overtones, Greybody Factors and Strong Cosmic Censorship of Einstein-Skyrme Black Holes

$P$ -- $V$ criticality, Joule--Thomson expansion, and holographic heat engine of charged Hayward-AdS black holes with a cloud of strings and perfect fluid dark matter

Comment on "Black hole in Dehnen $(1, 4, \frac{1}{2})$ dark matter halo: exact solution, lensing, light ring, and thermodynamics (EPJC 85 (2025) 1256)"