EHT tests of the strong-field regime of general relativity
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Publication:5164328
DOI10.1088/1361-6382/AC27EDzbMATH Open1480.83100arXiv2011.06812OpenAlexW3199365815MaRDI QIDQ5164328
Author name not available (Why is that?)
Publication date: 11 November 2021
Published in: (Search for Journal in Brave)
Abstract: Following up on a recent analysis by Psaltis et al. [Phys. Rev. Lett. 125, 141104 (2020)], we show that the observed shadow size of M87 can be used to unambiguously and robustly constrain the black hole geometry in the vicinity of the circular photon orbit. Constraints on the post-Newtonian weak-field expansion of the black hole's metric are instead more subtle to obtain and interpret, as they rely on combining the shadow-size measurement with suitable theoretical priors. We provide examples showing that post-Newtonian constraints resulting from shadow-size measurements should be handled with extreme care. We also discuss the similarities and complementarity between the EHT shadow measurements and black-hole gravitational quasi-normal modes.
Full work available at URL: https://arxiv.org/abs/2011.06812
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