Non-Commutative Resolutions of Toric Varieties

Abstract

Let $R$ be the coordinate ring of an affine toric variety. We show that the endomorphism ring $En{d}_R(\mathbb{A}),$ where $\mathbb{A}$ is the (finite) direct sum of all (isomorphism classes of) conic $R$-modules, has finite global dimension. Furthermore, we show that $En{d}_R(\mathbb{A})$ is a non-commutative crepant resolution if and only if the toric variety is simplicial. For toric varieties over a perfect field $k$ of prime characteristic, we show that the ring of differential operators $D_{\mathsf{k}}(R)$ has finite global dimension.

V2: edits, final version to appear in Advances