Separating astrophysics and geometry in black hole images

@article{Lara2021SeparatingAA,
  title={Separating astrophysics and geometry in black hole images},
  author={Guillermo Lara and Sebastian H. V{\"o}lkel and Enrico Barausse},
  journal={Physical Review D},
  year={2021}
}
The observation of the shadow of the supermassive black hole M87 ∗ by the Event Horizon Telescope (EHT) is sensitive to the spacetime geometry near the circular photon orbit and beyond, and it thus has the potential to test general relativity in the strong field regime. Obstacles to this pro-gram, however, include degeneracies between putative deviations from general relativity and both the description of the accretion flow and the uncertainties on “calibration parameters”, such as e.g. the mass… 
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