We report on the polarized light curves of the Galactic Center supermassive black hole
Sagittarius A*, obtained at millimeter wavelength with the Atacama Large Millimeter …

Abstract The Event Horizon Telescope (EHT) Collaboration recently published the first
images of the supermassive black holes in the cores of the Messier 87 and Milky Way …

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 …

Simulated images of a black hole surrounded by optically thin emission typically display two
main features: a central brightness depression and a narrow" photon ring" consisting of …

Interpreting horizon-scale observations of astrophysical black holes demands a general
understanding of null geodesics in the Kerr spacetime. These may be divided into two …

Context. High-frequency very-long-baseline interferometry (VLBI) observations can now
resolve the event-horizon-scale emission from sources in the immediate vicinity of nearby …

Context. The flaring events observed in the Sagittarius A* supermassive black hole system
can be attributed to the nonhomogeneous nature of the near-horizon accretion flow. Bright …

The Event Horizon Telescope (EHT) is a millimeterwavelength, Earth-sized very long
baseline interferometry experiment that has recently imaged the shadow of the black hole …

Gravitational atoms produced from the superradiant extraction of rotational energy of
spinning black holes can reach energy densities significantly higher than that of dark matter …

Recent interferometric observations by the Event Horizon Telescope have resolved the
horizon-scale emission from sources in the vicinity of nearby supermassive black holes …