Andreotti-Mayer loci and the Schottky problem
Ciro Ciliberto, Gerard van der Geer
Abstract
We prove a lower bound for the codimension of the Andreotti-Mayer locus Ng,1 and show that the lower bound is reached only for the hyperelliptic locus in genus 4 and the Jacobian locus in genus 5. In relation with the boundary of the Andreotti-Mayer loci we study subvarieties of principally polarized abelian varieties (B,Theta) parametrizing points b such that Theta and the translate Thetab are tangentially degenerate along a variety of a given dimension.
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