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Probing a nonlinear electrodynamics black hole with thin accretion disk, shadow and deflection angle with M87* and Sgr A* from EHT

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arxiv 2205.11072 v2 pith:5DUQ4WN7 submitted 2022-05-23 gr-qc astro-ph.HE

Akhil Uniyal , Reggie C. Pantig , Ali Övgün This is my paper · ORCID
classification gr-qcastro-ph.HE
keywords blackelectrodynamicsholeaccretiondiskparametersangledeflection
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abstract

Non-linear interaction between the electromagnetic fields (EMF) occurs when vacuum polarization in quantum electrodynamics (QED) happens. The field of non-linear electrodynamics, which may result from this interaction, could have important effects on black hole physics. This paper considers the asymptotically flat black hole solution in Einstein-nonlinear electrodynamics (NLE) fields. We study the effect of the NLE parameters on the black hole deflection angle using the Gauss-Bonnet theorem in weak field limits, shadow cast using the null geodesics method, and thin accretion disk using the Novikov-Thorne model. In particular, we studied the time-averaged energy flux, the disk temperature, the differential luminosity, the different emission profiles, and infalling spherical accretion. Then we show how the physical quantities depend on $\beta$ and $C$ parameters of NLE and provide some constraints on the NLE parameters using the observations of M87* and Sgr A* from EHT.

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Cited by 4 Pith papers

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  1. Evaporating cosmologically coupled black holes

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    If a black hole's mass grows with cosmic expansion, Hawking evaporation is slowed or reversed, weakening gamma-ray bounds on primordial black holes.

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    EHT shadow sizes give P̃_y≤0.17 for extra-dimensional photon momentum and k≤0.074 for halo compactness, but the headline 2.16 to 2.6 mm extra-dimension length is not robust.

  3. Optical and orbital characterization of spherically symmetric static black holes of self-gravitating new nonlinear electrodynamics model

    gr-qc 2026-03 conditional novelty 4.0 of 10

    PINLED Y^n black holes have charge-driven inward shifts of photon sphere, shadow, and ISCO, with null-geodesic observables distinguishing them from RN more clearly than timelike ones.

  4. Stability Analysis of Circular Geodesics in Dyonic Dilatonic Black Hole Spacetimes

    gr-qc 2024-11 conditional novelty 4.0 of 10

    A proof that dyonic-like dilatonic black holes have a unique innermost stable circular orbit, plus explicit ISCO formulas for selected values of the dilaton coupling parameter.

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