Towards a Taub-Bolt to Taub-NUT via Ricci flow with surgery

This paper shows for the first time the existence of a Ricci flow with surgery with local topology change $\mathbb{C}\mathbb{P}$^2\setminus{ $\mathrm{p}\mathrm{t}$} \rightarrow $\mathbb{R}$^4. The post surgery flow converges to the Taub-NUT metric on $\mathbb{R}$^4 in infinite time.