668 citations · 3.4k across the 62 of their papers we have counts for
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Can the EHT M87 results be used to test general relativity?
Samuel E. Gralla
No. All theoretical predictions for the observational appearance of an accreting supermassive black hole, as measured interferometrically by a sparse Earth-sized array at current o…
The Shape of the Black Hole Photon Ring: A Precise Test of Strong-Field General Relativity
Samuel E. Gralla, Alexandru Lupsasca, Daniel P. Marrone
We propose a new test of strong-field general relativity (GR) based on the universal interferometric signature of the black hole photon ring. The photon ring is a narrow ring-shape…
On the Observable Shape of Black Hole Photon Rings
Samuel E. Gralla, Alexandru Lupsasca
Motivated by the prospect of measuring a black hole photon ring, in previous work we explored the interferometric signature produced by a bright, narrow curve in the sky. Interfero…
Measuring the shape of a black hole photon ring
Samuel E. Gralla
General relativity predicts that gravitational lensing near black holes will produce narrow "photon rings" on images. Building on recent work of Johnson, Lupsasca et al. focusing o…
Consistent Blandford-Znajek Expansion
Jay Armas, Yangyang Cai, Geoffrey Compére +2
The Blandford-Znajek mechanism is the continuous extraction of energy from a rotating black hole via plasma currents flowing on magnetic field lines threading the horizon. In the d…