Wormhole nucleation is achieved via 0-surgery yielding a singular cobordism, resolved by connected sum with CP² to produce a nonsingular Lorentzian metric with closed timelike curves and violated energy conditions.
Penrose,Techniques of Differential Topology in Rela- tivity(Society for Industrial and Applied Mathematics, 1972)
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Wormhole Nucleation via Topological Surgery in Lorentzian Geometry
Wormhole nucleation is achieved via 0-surgery yielding a singular cobordism, resolved by connected sum with CP² to produce a nonsingular Lorentzian metric with closed timelike curves and violated energy conditions.