Abstract
Moduli spaces of varieties in characteristic p are stratified by Newton polygons. For example, the moduli space of polarized K3 surfaces of degreedadmits a stratification by the height h. Using the classification of supersingular K3 crystals, we determine the dimension and singular locus of each stratum. For example, ifdis prime topthe singular locus of the set where the height is at leasthcoincides with the set of points where the Artin invariant ao is <h − 1.
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