![]() This kind of singularity has the following peculiar property. Since a point cannot support rotation or angular momentum in classical physics (general relativity being a classical theory), the minimal shape of the singularity that can support these properties is instead a ring with zero thickness but non-zero radius, and this is referred to as a ringularity or Kerr singularity. ![]() With a fluid rotating body, its distribution of mass is not spherical (it shows an equatorial bulge), and it has angular momentum. This is not the case with a rotating black hole (a Kerr black hole). When a spherical non-rotating body of a critical radius collapses under its own gravitation under general relativity, theory suggests it will collapse to a single point.
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