Strong-field GR tests + EHT

Layer 1 — Physicsin the quantum-gravity-phenomenology subtree

EHT 2019/2022: M87* + SagA* black-hole shadows match Kerr to ~10%. LIGO 2015- BH-mergers probe ringdown. GW170817 multi-messenger. Test deviations from GR predictions.

Related concepts

Matrix and determinant

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