299 citations · 2.2k across the 79 of their papers we have counts for
20 papers · 1 filter
Horizon brightened acceleration radiation from massive vector fields
Reggie C. Pantig, Ali Övgün
In this paper, we develop a quantum-optical treatment of acceleration radiation for atoms freely falling into a Schwarzschild black hole when the ambient field is a massive spin-1…
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…
Ringdown modulation of acceleration radiation in the Schwarzschild background
Reggie C. Pantig
We derive an analytic first-order description of how Schwarzschild ringdown affects a detector-based detailed-balance diagnostic in a near-horizon, single-mode setting. A freely fa…
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…
Time-dependent black hole lensing from ringdown quasinormal mode
Reggie C. Pantig
Is it possible to find imprints of a black hole ringdown through gravitational lensing? To address this question, we formulate an analytic description of weak-field and strong-defl…
Shadow Ringing of Black Holes from Photon Sphere Quasinormal Modes
Reggie C. Pantig
The recent convergence of gravitational-wave (GW) observations and black hole imaging provides complementary probes of strong-gravity dynamics. While the black hole shadow is typic…
Gravitational Black Hole Shadow Spectroscopy
Reggie C. Pantig, Ali Övgün
In this work, we develop a generalized perturbative framework for gravitational shadows in static, spherically symmetric spacetimes. Building upon the recent two-parameter perturba…
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…
HBAR entropy of Infalling Atoms into a GUP-corrected Schwarzschild Black Hole and equivalence principle
Ali Övgün, Reggie C. Pantig
In this work, we have investigated the phenomenon of acceleration radiation exhibited by a two-level atom freely falling into a Generalized Uncertainty Principle (GUP)-corrected Sc…
Extended uncertainty principle inspired black hole in a Gödel Universe
Reggie C. Pantig
We explore analytically the implications of a curvature-modified extended uncertainty principle (EUP) derived in a rotating Gödel spacetime and apply it to the construction of a se…
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…
Charged black holes in Kalb-Ramond gravity: Weak Deflection Angle, Shadow cast, Quasinormal Modes and Neutrino annihilation
Reggie C. Pantig, Ali Övgün, Ángel Rincón
In this paper, we investigate the phenomenology of electrically charged black holes in a Lorentz-violating gravitational framework mediated by a background Kalb-Ramond (KR) antisym…
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…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
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…
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…