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The masses and shadows of the black holes Sagittarius A* and M87* in modified gravity (MOG)

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arxiv 1904.04142 v4 pith:6JABF73T submitted 2019-04-08 gr-qc astro-ph.GA

J. W. Moffat , V. T. Toth This is my paper · ORCID
classification gr-qcastro-ph.GA
keywords blackholestheorygravitymassesmodifiedshadowsizes
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We present calculations for the anticipated shadow sizes of Sgr A* and the supermassive black hole in the galaxy M87 in the context of the MOG modified theory of gravity (also known as Scalar-Tensor-Vector-Gravity, or STVG). We demonstrate that mass estimates derived from stellar and gas dynamics in the vicinity of these black holes are the Newtonian masses of the black holes even in the MOG theory. Consequently, shadow sizes increase as a function of the key dimensionless MOG parameter alpha that characterizes the variable gravitational coupling coefficient G, and may offer an observational means to distinguish the MOG theory from standard general relativity.

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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. Testing the Schwarzschild metric in a strong field region with the Event Horizon Telescope

    gr-qc 2019-08 reject novelty 6.0 of 10

    A modified Schwarzschild metric with a horizon at n times the usual radius can reproduce M87*'s shadow-to-gas mass ratio only if n ≈ 3, not the n ≈ 2 the paper quotes, so the central numerical claim does not follow fr...

  2. Astrophysical properties of static black holes embedded in a Dehnen type dark matter halo with the presence of quintessential field

    gr-qc 2025-01 conditional novelty 4.0 of 10

    Adding a Dehnen-type dark matter halo and a quintessence field to a Schwarzschild black hole enlarges its shadow and lowers the frequency and damping rate of its quasinormal modes.

  3. Quasinormal modes and shadow of Schwarzschild black holes embedded in a Dehnen type dark matter halo exhibiting string cloud

    gr-qc 2024-12 reject novelty 3.0 of 10

    Adding a Dehnen dark matter halo and string cloud to a Schwarzschild black hole makes its shadow larger, but the paper's quasinormal-mode frequencies rest on a misstated perturbation potential.

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