The light ring and the appearance of matter accreted by black holes

@inproceedings{Cardoso2021TheLR,
  title={The light ring and the appearance of matter accreted by black holes},
  author={V. Cardoso and F. Duque and Arianna Foschi},
  year={2021}
}
The geometry of black hole spacetimes can be probed with exquisite precision in the gravitationalwave window, and possibly also in the optical regime. We study the accretion of bright spots – objects which emit strongly in the optical or in gravitational waves – by non-spinning black holes. The emission as the object falls down the hole is dominated by photons or gravitons orbiting the light ring, causing the total luminosity to decrease exponentially as Lo ∼ e−t/(3 √ . Late-time radiation is… Expand
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