All stars rotate more or less rapidly. When a horizon is formed during gravitational collapse, a Schwarzschild black hole is thus never produced. One expects, however, that the horizon will quickly settle down to a stationary state as a result of the emission of gravitational waves. The geometry of the stationary black hole is of course no longer spherically symmetric.
KeywordsBlack Hole Event Horizon Null Geodesic Kerr Black Hole Null Hypersurface
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