Abstract
A class of (noncompact) singularity-free spacetimes is found, where topology changes without violating the weak energy condition (wec) or the stable causality condition.
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Krasnikov, S.V. Topology change without any pathology. Gen Relat Gravit 27, 529–536 (1995). https://doi.org/10.1007/BF02105077
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DOI: https://doi.org/10.1007/BF02105077