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Weak gravitational lensing by Kerr-MOG Black Hole and Gauss-Bonnet theorem

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arxiv 1806.06453 v2 pith:O5WB3VVG submitted 2018-06-17 gr-qc

Ali Övgün , İzzet Sakall{i} , Joel Saavedra This is my paper · ORCID
classification gr-qc
keywords blackdeflectiongravitationalholekerr-moglensinganglegauss-bonnet
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abstract

The deflection angle of Kerr-MOG black holes is studied for different values of the parameter in modified gravity (MOG). To this end, we employ the Gauss-Bonnet theorem, which was first studied by Gibbons and Werner and then extended by Ono, Ishihara and Asada, who use a generalized optical metric where the deflection of light for an observer and source at finite distance. By using this method, we study the weak gravitational lensing by Kerr-MOG black hole. Our computations show that with an increase in the MOG parameter ($\alpha$), the deflection angle becomes significantly larger than that of Kerr black hole. The results obtained show that MOG effect could be taken into account in the gravitational lensing experiments.

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Cited by 3 Pith papers

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

  1. 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.

  2. Effect of the hair on deflection angle by asymptotically flat black holes in Einstein-Maxwell-dilaton theory

    gr-qc 2019-08 conditional novelty 4.0 of 10

    The paper derives explicit weak-field deflection formulas, including plasma corrections, for hairy black holes in Einstein-Maxwell-dilaton theory, with hair encoded through a dilaton potential parameter alpha.

  3. Deflection angle of photon from magnetized black hole and effect of nonlinear electrodynamics

    physics.gen-ph 2019-08 conditional novelty 3.0 of 10

    Using the Gauss-Bonnet theorem, the authors derive the weak-field photon deflection angle for Kruglov's magnetized black hole, yielding a new term proportional to beta times charge to the fourth over impact parameter ...

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