Thunderbolt
Thunderbolts (also called wave of death spacetimes) are a class of spacetimes which produces an infinitely strong null wave, producing a singularity which destroys the spacetime. Due to this, they do not qualify as naked singularities, as there exists no observer to the future of the singularity.
1. History
Thunderbolts were first discussed by Penrose in the 1975 paper "Singularities of Spacetime", where the exact conditions of the cosmic censorship hypothesis are discussed, one version being made to forbid thunderbolts.
2. Topology
3. Metrics and coordinates
4. Tensor quantities
5. Symmetries
6. Stress-energy tensor
7. Curves
8. Equations
9. Causal structure
10. Asymptotic structure
By definition, thunderbolt spacetimes contain a singularity.