The Hilbert scheme of points for supersingular abelian surfaces

Details The Hilbert scheme of points for supersingular abelian surfaces The Hilbert scheme of points for supersingular abelian surfaces

2006-06-12

arxiv.org/abs/math/0606267v1

Mathematics

Algebraic Geometry

31 pages, 5 figures

Scientific paper

We analyse the geometry of Hilbert schemes of points on abelian surfaces and Beauville's generalized Kummer varieties in positive characteristics. The main result is that, in characteristic two, the addition map from the Hilbert scheme of two points to the abelian surface is a quasifibration, such that all fibers are nonsmooth. In particular, the corresponding generalized Kummer surface is nonsmooth, and minimally elliptic singularities occur in the supersingular case. We unravel the structure of the singularities in dependence of p-rank and a-number of the abelian surface. To do so, we establish a McKay Correspondence for Artin's wild involutions.

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