Kerr Metric Black Holes

LYNDEN-BELL has suggested¹ that a massive collapsed object may lie at the centre of many galaxies, including our own, and that a continuing flux of matter into such a collapsed object, or ``black hole'', may be the source of energy for the non-thermal radiation observed to come from some galactic nuclei. The metric used to describe the geometry of space-time in the vicinity of the collapsed object in this and other papers² on collapsed objects in astrophysics has been the spherically symmetric Schwarz-schild metric, which is valid only if the collapsed object has zero angular momentum. In fact, one would expect any such collapsed object to possess considerable angular momentum, because a great deal of angular momentum must be lost from a typical galactic nucleus to permit collapse inside the gravitational radius in the first place.