On the Tits building of paramodular groups

Details On the Tits building of paramodular groups On the Tits building of paramodular groups

2004-05-17

arxiv.org/abs/math/0405321v1

Mathematics

Algebraic Geometry

19 pages

Scientific paper

We investigate the Tits buildings of the paramodular groups with or without canonical level structure, respectively. These give important combinatorical information about the boundary of the toroidal compactification of the moduli spaces of non-principally polarised Abelian varieties. We give a full classification of the isotropic lines for all of these groups. Furthermore, for square-free, coprime polarisations without level structure we show that there is only one top-dimensional isotropic subspace. In a sequel to this paper we will use this information to establish a general type result for the moduli space of non-principally polarised Abelian varieties with full level structure.

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