Observational Signatures of Dyonic Black Holes in Non-Linear Electrodynamics
Abstract
We study the observational features of thin-disk accretion and emission spectra for static, spherically symmetric dyonic black holes in non-linear electrodynamics (NLED). In contrast to classical Maxwell theory, where electromagnetic duality assumes equal charges, the coupling parameters in NLED introduce a new gravitational potential and modify the geometry in the strong-field regime. We also study the kinematic characteristics of particles on circular orbits, such as their angular velocity, specific energy, and specific angular momentum. It is found that modifications of NLED lead to a shrinkage of the ISCO radius, resulting in a shift of the radiation spectrum thermal maximum towards smaller radii and, consequently, an increase in the local effective temperature in comparison with the standard Schwarzschild and Reissner-Nordström solutions. Additionally, we compute null-geodesic orbits to determine the optical edge of both the photon sphere and the black hole shadow. In order to assess the observational validity of the aforementioned alternatives, we carry out a χ2 goodness-of-fit test through the angular diameter constraints at the horizon scale collected by the Event Horizon Telescope (EHT) concerning Sagittarius A* (Sgr A*). We prove that both these dyonic NLED and purely magnetic models have good statistical agreement with experimental data.
Related
- Observational Signatures of Kerr Black Hole Lensing
- Observational signatures of Kerr black hole lensing
- Dyonic black holes supporting nearly-black self-gravitating thin shells
- Swampland conjectures through ACT observations: Observational signatures of radiative-corrected inflation
- GW250114 reveals signatures of post-merger black-hole horizon
BibTeX
@misc{kazempour2026observational,
title = {{Observational Signatures of Dyonic Black Holes in Non-Linear Electrodynamics}},
author = {Sobhan Kazempour and Sichun Sun and Zhiqing He and Chengye Yu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.10866},
eprint = {2610.10866},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.10866},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Observational Signatures of Dyonic Black Holes in Non-Linear Electrodynamics
AU - Sobhan Kazempour
AU - Sichun Sun
AU - Zhiqing He
AU - Chengye Yu
PY - 2026
DA - 2026/10/07
PB - arXiv
DO - 10.48550/arxiv.2610.10866
UR - https://arxiv.org/abs/2610.10866
AB - We study the observational features of thin-disk accretion and emission spectra for static, spherically symmetric dyonic black holes in non-linear electrodynamics (NLED). In contrast to classical Maxwell theory, where electromagnetic duality assumes equal charges, the coupling parameters in NLED introduce a new gravitational potential and modify the geometry in the strong-field regime. We also study the kinematic characteristics of particles on circular orbits, such as their angular velocity, specific energy, and specific angular momentum. It is found that modifications of NLED lead to a shrinkage of the ISCO radius, resulting in a shift of the radiation spectrum thermal maximum towards smaller radii and, consequently, an increase in the local effective temperature in comparison with the standard Schwarzschild and Reissner-Nordström solutions. Additionally, we compute null-geodesic orbits to determine the optical edge of both the photon sphere and the black hole shadow. In order to assess the observational validity of the aforementioned alternatives, we carry out a χ^2 goodness-of-fit test through the angular diameter constraints at the horizon scale collected by the Event Horizon Telescope (EHT) concerning Sagittarius A* (Sgr A^*). We prove that both these dyonic NLED and purely magnetic models have good statistical agreement with experimental data.
ER -