Multigraded linear series and recollement

作者：Craw Alastair^*; Ito Yukari; Karmazyn Joseph

来源：Mathematische Zeitschrift, 2018, 289(1-2): 535-565.

DOI：10.1007/s00209-017-1965-1

• Linear series
• Moduli space of quiver representations
• Special McKay correspondence
• Noncommutative crepant resolutions

Given a scheme Y equipped with a collection of globally generated vector bundles , we study the universal morphism from Y 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 E 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.

• 出版日期2018-6