A Newtonian system that mimics the baldness of rotating black holes
Photo by Don DavisRotating black hole: one of nature’s most perfect objectsA physicist at Washington University in St. Louis has found a new twist on a 40-year-old discovery — “the Carter constant” — about the motion of particles in the external field of a rotating black hole. Clifford M. Will, Ph.D., the James S. McDonnell Professor of Physics in Arts & Sciences, has shown that even in Newton’s gravity, arrangements of masses exist whose gravitational field also admits a Carter-like constant of motion. The finding has implications for gravitational-wave astronomy, he says.