Geometric algebras on projective surfaces

Details Geometric algebras on projective surfaces Geometric algebras on projective surfaces

2009-10-27

arxiv.org/abs/0910.5016v2

Journal of Algebra 324 (2010), no. 7, 1687-1730

Mathematics

Rings and Algebras

39 pages; v2 results largely unchanged, but notation describing algebras revised significantly. As a result details of many pr

Scientific paper

10.1016/j.jalgebra.2010.05.005

Let X be a projective surface, let \sigma be an automorphism of X, and let L be a \sigma-ample invertible sheaf on X. We study the properties of a family of subrings, parameterized by geometric data, of the twisted homogeneous coordinate ring B(X, L, \sigma). In particular, we find necessary and sufficient conditions for these subrings to be noetherian. We also study their homological properties, their associated noncommutative projective schemes, and when they are maximal orders. In the process, we produce new examples of maximal orders; these are graded and have the property that no Veronese subring is generated in degree 1. Our results are used in a companion paper to give defining data for a large class of noncommutative projective surfaces.

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