Hunting for extra dimensions in the shadow of M87*

2019/05/31 by Sunny Vagnozzi, Luca Visinelli · 3 citations
Physics and Astronomy · #gr-qc #astro-ph.CO #hep-ph

paper · pdf · doi:10.1103/physrevd.100.024020

published as Phys. Rev. D 100 (2019) 024020 · v3: references added, version published in PRD

arxiv created 2019/07/12 · arxiv updated 2020/02/24

Abstract

The Event Horizon Telescope has recently provided the first image of the dark shadow around the supermassive black hole M87*. The observation of a highly circular shadow provides strong limits on deviations of M87*'s quadrupole moment from the Kerr value. We show that the absence of such a deviation can be used to constrain the physics of extra dimensions of spacetime. Focusing on the Randall-Sundrum AdS₅ brane-world scenario, we show that the observation of M87*'s dark shadow sets the limit ℓ \lesssim 170 \rm AU, where ℓ is the AdS₅ curvature radius. This limit is among the first quantitative constraints on exotic physics obtained from the extraordinary first ever image of the dark shadow of a black hole.

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