Topic: magnetic fields

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

Magnetic fields exert controllable forces that generate microscopic actuation and locomotion in soft materials with superparamagnetic or ferromagnetic components. I will describe the shape changes and materials parameters required to drive and direct matter including filaments, membranes and hydrogels with magnetic components using precessing magnetic fields