Gravitational collapse and spacetime singularities

@inproceedings{Penrose1965GravitationalCA,
  title={Gravitational collapse and spacetime singularities},
  author={Roger Penrose},
  year={1965}
}
accompanied by a violent release of energy, possible in the form of gravitational radiation. The detailed mathematical discussion of such situations is difficult since the full complexity of general relativity is required. Consequently, most exact calculations concerned with the implications of gravitational collapse have employed the simplifying assumption of spherical symmetry. Unfortunately, this precludes any detailed discussion of gravitational radiation – which requires at least a… 
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