https://doi.org/10.1140/epjp/s13360-026-07874-4
Regular Article
Light Bending and Shadow of a Non-Singular Magnetically Charged Black Hole: Plasma Effects and EHT Constraints
1
National University of Uzbekistan, 100174, Tashkent, Uzbekistan
2
Institute of Fundamental and Applied Research, National Research University TIIAME, Kori Niyoziy 39, 100000, Tashkent, Uzbekistan
3
Kimyo International University in Tashkent, Shota Rustaveli str. 156, 100121, Tashkent, Uzbekistan
4
Research Center of Astrophysics and Cosmology, Khazar University, 41 Mehseti Street, AZ1096, Baku, Azerbaijan
5
School of Physics, Harbin Institute of Technology, 150001, Harbin, People’s Republic of China
6
University of Tashkent for Applied Sciences, Str. Gavhar 1, 100149, Tashkent, Uzbekistan
7
Andijan State University, Universitet Str. 129, 170100, Andijan, Uzbekistan
8
International Islamic Academy of Uzbekistan, Abdulla Qodiriy 11, 100002, Tashkent, Uzbekistan
a
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Received:
14
April
2026
Accepted:
23
May
2026
Published online:
10
June
2026
Abstract
The shadow and lensing of an asymptotic, magnetically charged, non-singular (AMCNS) black hole are profoundly modified in the presence of a plasma. We show that increasing plasma frequency enlarges the photon sphere radius, while the observed shadow radius decreases due to the dispersive plasma contribution. In contrast, the non-singularity parameter 
decreases both the photon sphere and shadow radius. A comparison with the Event Horizon Telescope data for Sgr A* allows us to constrain the parameter space, favoring 
and specific low values of q. In weak-field lensing, we establish a definitive hierarchy of deflection angles: Uniform plasma causes the strongest bending, followed by vacuum and then a singular isothermal sphere (SIS) plasma. This lensing analysis predicts three images and demonstrates that plasma substantially boosts magnification. Our findings provide specific, testable predictions to identify regular black holes with magnetic charge against the complex backdrop of astrophysical plasmas.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2026
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
