A few results from a quick search on changing the topology of spacetime. There was a bunch more. It seems to be an area of research anyway. https://arxiv.org/a

A few results from a quick search on changing the topology of spacetime. There was a bunch more. It seems to be an area of research anyway. https://arxiv.org/abs/1212.3000 https://arxiv.org/abs/1212.3000 https://arxiv.org/abs/hep-th/9311186 https://arxiv.org/abs/hep-th/9311186 http://adsabs.harvard.edu/full/1997BASI...25..571B http://adsabs.harvard.edu/full/1997BASI...25..571B