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EHT tests of the strong-field regime of general relativity

Nov 13, 2020
8 pages
Published in:
  • Class.Quant.Grav. 38 (2021) 21, 21LT01,
  • Class.Quant.Grav. 38 21
  • Published: Oct 11, 2021
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Abstract: (IOP)
Following up on a recent analysis by Psaltis et al (2020 Phys. Rev. Lett. 125 141104), 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.
Note:
  • Published as letter in Classical and Quantum Gravity, 8 pages, 3 figures
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