Formal matched asymptotics for degenerate Ricci flow neckpinches

Sigurd B. Angenent, James Isenberg, Dan Knopf

Gu and Zhu have shown that Type-II Ricci flow singularities develop from nongeneric rotationally symmetric Riemannian metrics on $S^m$, for all $m\ge 3$. In this paper, we describ…