Multigraded linear series and recollement
Abstract
Given a scheme equipped with a collection of globally generated vector bundles , we study the universal morphism from to a fine moduli space of cyclic modules over the endomorphism algebra of . This generalises the classical morphism to the linear series of a basepoint-free line bundle on a scheme. We describe the image of the morphism and present necessary and sufficient conditions for surjectivity in terms of a recollement of a module category. When the morphism is surjective, this gives a fine moduli space interpretation of the image, and as an application we show that for a small, finite subgroup , every sub-minimal partial resolution of is isomorphic to a fine moduli space where is a summand of the bundle defining the reconstruction algebra. We also consider applications to Gorenstein affine threefolds, where Reid's recipe sheds some light on the classes of algebra from which one can reconstruct a given crepant resolution.
Keywords
Cite
@article{arxiv.1701.01679,
title = {Multigraded linear series and recollement},
author = {Alastair Craw and Yukari Ito and Joseph Karmazyn},
journal= {arXiv preprint arXiv:1701.01679},
year = {2017}
}
Comments
30 pages, previous upload was not quite the final version as claimed; this version to appear in Mathematische Zeitschrift