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.
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A new metric-affine gravity toy model dynamically generates a global time function via projective invariance breaking to enforce stable causality, recovering mimetic gravity and yielding a broader dark sector.
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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.
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Metric affine gravity with dynamical chronology protection
A new metric-affine gravity toy model dynamically generates a global time function via projective invariance breaking to enforce stable causality, recovering mimetic gravity and yielding a broader dark sector.