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Shadows of Kerr-like black holes in a modified gravity theory

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arxiv 1810.12767 v2 pith:YDWGTU7I submitted 2018-10-30 gr-qc hep-th

classification gr-qchep-th
keywords blackalphaparameterholeholesshadowscastemission
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

In this paper, the shadows cast by non-rotating and rotating modified gravity black holes are investigated. In addition to the black hole spin parameter $a$ and the inclination angle $\theta$ of observer, another parameter $\alpha$ measuring the deviation of gravitational constant from the Newton one is also found to affect the shape of the black hole shadow. The result shows that, for fixed values of $a/M$ and $\theta$, the size and perimeter of the shadows cast by the non-rotating and rotating black holes significantly increase with the parameter $\alpha$, while the distortions decrease with $\alpha$. Moreover, the energy emission rate of the black hole in high energy case is also investigated, and the result shows that the peak of the emission rate decreases with the parameter $\alpha$.

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Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Schwarzschild Black Holes Immersed in Born-Infeld Magnetic Fields and Their Observational Signatures

    gr-qc 2025-06 conditional novelty 6.0 of 10

    Numerically solving full Born-Infeld magnetic fields around a Schwarzschild black hole makes meridional photon orbits prolate and elongates the black hole shadow along the polar axis at high inclination.

  2. Spherical photon orbits around Kerr-MOG black hole

    gr-qc 2024-12 conditional novelty 5.0 of 10

    Spherical photon orbits around Kerr-MOG black holes are classified, with a critical inclination angle switching the number of orbits from four to two.

  3. On new regular charged black hole solutions: Limiting Curvature Condition, Quasinormal modes and Shadows

    gr-qc 2024-11 conditional novelty 5.0 of 10

    The authors introduce two new regular black hole metrics from nonlinear electrodynamics and two Limiting Curvature Condition versions, with numerical results for stability, shadows, and quasinormal modes.

  4. Connection Between the Shadow Radius and Quasinormal Frequencies for Black Holes in STVG with Perfect Fluid Dark Matter

    gr-qc 2026-03 conditional novelty 4.0 of 10

    In STVG with PFDM, eikonal QNM real frequencies equal multipole number over shadow radius, so shadow size and ringdown are dual photon-sphere observables.

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