212 citations · 6.6k across the 163 of their papers we have counts for
17 papers · 1 filter
Acceleration radiation from vibrating atoms in Schwarzschild spacetime
Reggie C. Pantig, Ali Övgün, Syed Masood +1
Motivated by the work of Scully \textit{et al.} [ \textcolor{blue}{Proc. Nat. Acad. Sci. 115, 8131 (2018)}] and Dolan \textit{et al.}[ \textcolor{blue}{New J. Phys. 22, 033026 (202…
Quasinormal Mode Spectroscopy via Horizon-Brightened Quantum Optics
Ali Övgün
We develop a quantum optical framework for probing black hole quasinormal modes (QNMs) using two-level atoms in the spirit of the horizon-brightened acceleration radiation (HBAR) p…
Josephson's effect in the Schwarzschild background
Reggie C. Pantig, Ali Övgün
We develop a fully covariant, analytic framework for Josephson phenomena in static curved spacetimes and specialize it to the Schwarzschild exterior. The formulation rests on two i…
Acceleration Radiation from Derivative-Coupled Atoms Falling in Modified Gravity Black Holes
Reggie C. Pantig, Ali Övgün
The interaction of quantum detector models with fields in curved spacetimes provides fundamental insights into phenomena such as Hawking and Unruh radiation. While standard models…
Semi-Analytic Trajectory Analysis of Light in Generic Static Spacetimes
Ali Övgün, Reggie C. Pantig
We study a unified semi-analytical framework to study null geodesics and weak-field light deflection in generic static, spherically symmetric spacetimes of the form \(ds^2 = -α(r,δ…
The Sound of an Orbit: A Quantum Spectrum at the ISCO
Reggie C. Pantig, Ali Övgün
We investigate the quantum signature of the innermost stable circular orbit (ISCO), a region of profound importance in black hole astrophysics. By modeling an atom as an Unruh-DeWi…
Probing Weak-Force Corrections to Black Hole Geometry via Long Range Potentials: Feinberg-Sucher and Ferrer-Nowakowski Potentials
Ali Övgün
We consider corrections to the Schwarzschild black hole metric arising from exotic long-range forces within quantum field theory frameworks. Specifically, we analyze two models: th…
Probing Quantum Gravity in Stellar Spacetimes: Phenomenological Insights
Reggie C. Pantig, Ali Ovgun, Gaetano Lambiase
We explore the weak-field phenomenology of a compact star spacetime modified by quantum gravitational corrections derived from the effective field theoretical (EFT) approach by Cal…
Black Hole Solutions in Dark Photon Models with Higher Order Corrections
Ali Övgün, Reggie C. Pantig
In this work, we derive new analytic, static, symmetric black hole solutions in theories involving dark photons with minimal and higher-order magnetic dipole interactions. Starting…
Phenomenology of Schwarzschild-like Black Holes with a Generalized Compton Wavelength
Reggie C. Pantig, Ali Ovgun, Gaetano Lambiase
We investigate the influence of the generalized Compton wavelength (GCW), emerging from a three-dimensional dynamical quantum vacuum (3D DQV) on Schwarzschild-like black hole space…
Weak Gravitational Lensing in Ricci-Coupled Kalb-Ramond Bumblebee Gravity: Global Monopole and Axion-Plasmon Medium Effects
Ali Övgün
In this paper, we study the influence of the axion-plasmon medium, as proposed in [10.1103/PhysRevLett.120.181803]\cite{Tercas:2018gxv}, on the optical properties of black holes in…
Shedding Light on Gravity: Black Hole Shadows and Lensing Signatures in Lorentz Gauge Theory
Ali Övgün, Mohsen Fathi
Recent advances, including gravitational wave detections and imaging of black hole shadows, have strongly validated general relativity. Nevertheless, ongoing cosmological observati…
Multimodal signatures of asymptotic (A)dS Kalb-Ramond black holes: Constraints through the shadow, weak deflection angle, and topological photon spheres
Reggie C. Pantig, Ali Övgün
This study explores novel static, neutral black hole solutions within Kalb-Ramond (KR) gravity in asymptotically (anti-)de Sitter [(A)dS] spacetimes, incorporating spontaneous Lore…
Analyzing Deflection Angles and Photon Sphere Dynamics of Magnetically Charged Black Holes in Nonlinear Electrodynamic
Hira Waseem, Nikko John Leo S. Lobos, Ali Övgün +1
In this paper, we investigate the gravitational lensing properties of magnetically charged black holes within the framework of nonlinear electrodynamics. We derive the deflection a…
Formation of regular black hole from baryonic matter
Vitalii Vertogradov, Ali Övgün, Daniil Shatov
We present a family of exact, singularity-free solutions describing the collapse of baryonic matter characterized by a barotropic equation of state whose coefficient varie…
Black hole in the Dekel-Zhao dark matter profile
Ali Övgün, Reggie C. Pantig
Motivated by the work of Cardoso et al. [Phys. Rev. D 105 (2022) 6, L061501, https://doi.org/10.1103/PhysRevD.105.L061501] on black holes in galaxies, we derive a new black hole so…
Black hole with global monopole charge in self-interacting Kalb-Ramond field
Mohsen Fathi, Ali Övgün
In this study, we explore a static, spherically symmetric black hole solution in the context of a self-interacting Kalb-Ramond field coupled with a global monopole. By incorporatin…