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Observational data of the Sagittarius A* (Sgr A*) shadow released by the Event Horizon Telescope are used to investigate eventual deviations in the black hole shadow radius, aiming to seek physics beyond the Standard Model coming from extra-dimensional theory. We consider the braneworld scenario described by the Randall-Sundrum model and determine the black hole shadow radius correction owing to the higher dimension. From data of the shadow radius in units of black hole mass determined by Keck- and Very Large Telescope Interferometer (VLTI) -based estimates, we imposed restrictions on the deviation obtained, and one sets an upper limit to the curvature radius of anti--de Sitter (AdS₅) spacetime (₊₄₂₊) 3. 810^-2 AU and (ₕ₋ₓ₈) 1. 610^-2 AU (at 68% confidence level), respectively.
Lemos et al. (Mon,) studied this question.