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
11 papers · 2 filters
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…