Moduli of $G$-constellations and crepant resolutions II: the Craw-Ishii conjecture

Abstract

For any given finite subgroup $G\subset S{L}_3(\mathbb{C})$, we show that every projective crepant resolution $X$ of the quotient variety ${\mathbb{C}}^3/G$ is isomorphic to the moduli space of $\theta$-stable $G$-constellations for a generic stability condition $\theta$, as conjectured by Craw and Ishii. We also show that generators of the Cox ring of $X$ can be obtained from semi-invariants for representations of the McKay quiver of $G$.

arXiv comment48 pages. v3: revised as suggested by the referees. Section 5 in the previous version was cut off and will be incorporated into another paper. To appear in Duke Mathematical Journal