The supersingular loci and mass formulas on Siegel modular varieties
Abstract
We describe the supersingular locus of the Siegel 3-fold with a parahoric level structure. We also study its higher dimensional generalization. Using this correspondence and a deep result of Li and Oort, we evaluate the number of irreducible components of the supersingular locus of the Siegel moduli space g,1,N for arbitrary g.
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