170 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Eastern Mediterranean UniversityCY48 papers
- University of SalernoIT10 papers
- Istituto Nazionale di Fisica NucleareIT9 papers
- De La Salle UniversityPH4 papers
- Sabancı ÜniversitesiTR4 papers
- University of Santo TomasPH4 papers
- Khazar UniversityAZ3 papers
- National University of UzbekistanUZ3 papers
- New Uzbekistan UniversityUZ3 papers
- University of AlicanteES3 papers
- University of EducationPK3 papers
- University of OkaraPK3 papers
59 papers
Redshift Spectroscopy as a Probe of Regular Black Holes, Black Bounces, and Scalar-Hair Compact Objects
Ali Övgün, Reggie C. Pantig, Joel Saavedra
Motivated by [Phys. Rev. D. 107, 064019 (2023)], we develop a unified and model-independent framework for the spectroscopy of photon frequency shifts in generic static, spherically…
An obstruction and residual-completion theory for Newman--Janis deformations
Reggie C. Pantig, Ali Övgün
We formulate an obstruction and residual-completion theory for Newman-Janis-type deformations of black hole seeds, where Newman-Janis-type includes both the original complex-coordi…
Energy extraction from NED-deformed rotating black holes via the Comisso-Asenjo reconnection process
Marco Figliolia, Gaetano Lambiase, Ali Övgün +1
We study rotating black holes in general relativity coupled to nonlinear electrodynamics (NED), focusing on an axisymmetric solution with deformation parameter . On the spherica…
Noether charges and the first law of thermodynamics for multifractional Schwarzschild black hole in the q-derivative theory
Reggie C. Pantig
In this paper, we investigate black-hole thermodynamics in the multi-fractional theory with -derivatives, focusing on static, spherically symmetric vacuum solutions in the spher…
Reference-renormalized curvature-primitive Gauss-Bonnet formalism for finite-distance weak gravitational lensing in static spherical spacetimes
Reggie C. Pantig, Ali Övgün
We develop a reference-renormalized (photon-sphere-free) normalization scheme for Gauss-Bonnet gravitational lensing at finite distance in static, spherically symmetric spacetimes.…
Josephson Effects in Slowly Rotating Spacetimes
Nurmukhammed Aytimbetov, Reggie C. Pantig, Ali Övgün +2
We investigate Josephson phenomena in a slowly rotating stationary spacetime, emphasizing the distinct roles of gravitational redshift and rotational frame dragging motivated by [1…
Gauss-Bonnet lensing of spinning massive particles in static spherically symmetric spacetimes
Reggie C. Pantig, Ali Övgün
We extend the finite-distance Jacobi-metric Gauss-Bonnet framework of Li \textit{et al}. [10.1103/PhysRevD.101.124058] to massive test particles carrying intrinsic spin. At pole-di…
Horizon-Brightened Acceleration Radiation and Optical Signatures of Generic Regular Black Holes from Nonlinear Electrodynamics
Uktamjon Uktamov, Ali Övgün, Reggie C. Pantig +1
We investigate horizon-brightened acceleration radiation (HBAR) and optical signatures for a broad class of regular black holes sourced by nonlinear electrodynamics. The spacetimes…
Radial Integral Reformulation of the Gauss-Bonnet Weak Deflection Angle at Finite Distance
Ali Övgün, Reggie C. Pantig
We develop a radial integral reformulation of finite distance gravitational lensing in optical geometry for static, spherically symmetric spacetimes. Starting from the Gauss-Bonnet…
Finite Distance Corrections to Vacuum Birefringence in Strong Gravitational and Electromagnetic Fields
Ali Övgün, Reggie C. Pantig
We study polarization dependent photon propagation in static, spherically symmetric spacetimes permeated by strong magnetic fields, with the aim of quantifying how finite emission…
Boundary-only weak deflection angles from isothermal optical geometry
Ali Övgün, Reggie C. Pantig
We develop a boundary only method for computing weak gravitational deflection angles at finite source and receiver distances within the Gauss-Bonnet theorem formulation of optical…
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…
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…
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…
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…