Topic: charged black holes

Ruchi Mishra compares magnetized accretion onto charged black holes and horizonless compact objects using ongoing three-dimensional general-relativistic magnetohydrodynamic simulations. In a Reissner–Nordström spacetime whose charge exceeds its mass, a naked singularity replaces the event horizon, with a repulsive region, a zero-gravity radius, and a different structure of circular orbits. Earlier equilibrium calculations found toroidal rotating-fluid configurations around such singularities. Building on that work, the simulations examine how charge changes the accumulation of matter, transpor

Black holes in theories with a preferred frame acquire parameters describing their response to motion relative to it. This talk calculates those sensitivities for neutral and charged black holes in Einstein-aether and khronometric gravity. Across much of the parameter space, different cases approach a small common limit. The presentation explains the calculation and considers possible implications for future gravitational-wave measurements, including LISA.