668 citations · 3.4k across the 62 of their papers we have counts for
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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…
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: 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…
An asymptotic framework for gravitational scattering
Geoffrey Compère, Samuel E. Gralla, Hongji Wei
Asymptotically flat spacetimes have been studied in five separate regions: future/past timelike infinity , future/past null infinity , and spatial infinity…
Electromagnetic Scoot
Samuel E. Gralla, Kunal Lobo
Recent work on scattering of massive bodies in general relativity has revealed that the mechanical center of mass of the system (or, more precisely, its relativistic mass moment) u…