Singular Quiver Varieties over Extended Dynkin Quivers
arXiv:2208.09359
Abstract
We classify the singularities in the unframed Nakajima quiver varieties associated with extended Dynkin quivers and the corresponding minimal imaginary root with a small restriction on the parameter and use this to construct a number of hyper-Kähler cobordisms between binary polyhedral spaces.
24 pages