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The Black Hole Explorer: Motivation and Vision
Michael D. Johnson, Kazunori Akiyama, Rebecca Baturin +65
We present the Black Hole Explorer (BHEX), a mission that will produce the sharpest images in the history of astronomy by extending submillimeter Very-Long-Baseline Interferometry…
The Black Hole Explorer: Photon Ring Science, Detection and Shape Measurement
Alexandru Lupsasca, Alejandro Cárdenas-Avendaño, Daniel C. M. Palumbo +6
General relativity predicts that black hole images ought to display a bright, thin (and as-of-yet-unresolved) ring. This "photon ring" is produced by photons that explore the stron…
Frames and Slicings for Angular Momentum in Post-Minkowski Scattering
Samuel E. Gralla, Kunal Lobo, Hongji Wei
In relativistic physics, angular momentum is paired with a lesser known conserved quantity, the "mass moment", which appears as the time-space components of the angular momentum te…
Probing and resolving AGN disks with ultrafast photon counters
Neal Dalal, Marios Galanis, Charles Gammie +2
Intensity interferometry is a technique developed many decades ago, that has recently enjoyed a renaissance thanks in part to advances in photodetector technology. We investigate t…