668 citations · 3.4k across the 62 of their papers we have counts for
62 papers
Amplification of metric perturbations by extremal horizons
Samuel E. Gralla, Sepehr Salamat
Under normal circumstances, an observer falling into a black hole feels nothing special upon crossing the horizon. In this paper we find an intriguing exception: For most of the pa…
Plasma flow in force-free magnetospheres: two-fluid model near pulsars and black holes
Morifumi Mizuno, Samuel E. Gralla, Alexander Philippov
Force-free electrodynamics describes the electromagnetic field of the magnetically dominated plasma found near pulsars and active black holes, but gives no information about the un…
Schwinger effect with backreaction in 1+1D massive QED with a strong external field
Samuel E. Gralla, Morifumi Mizuno
In the presence of a strong electric field, the vacuum is unstable to the production of pairs of charged particles -- the Schwinger effect. The created pairs extract energy from th…
Can black holes evaporate past extremality?
Samuel E. Gralla
Black holes with sufficiently large initial charge and mass will Hawking-evaporate towards the extremal limit. The emission slows as the temperature approaches zero, but still reac…
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…