output
20222026
most citedShadow, lensing, quasinormal modes, greybody bounds and neutrino propagation by dyonic ModMax black holes

170 citations

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

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Showing 2026Show all

11 papers · 1 filter

gr-qc2026

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…

gr-qc2026

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…

gr-qc2026

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…

gr-qc2026

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…

gr-qc2026★ 3 cited

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.…

gr-qc2026

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…

gr-qc2026★ 3 cited

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…

gr-qc2026★ 1 cited

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…

gr-qc2026

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…

gr-qc2026★ 1 cited

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…

gr-qc2026★ 3 cited

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…