Boundary combinatorics of orthogonal modular 4-folds
arXiv:1604.00726
Abstract
We study combinatorial problems related to the singularities and boundary components of toroidal compactifications of orthogonal modular varieties. In particular, those associated with the moduli of algebraic deformation generalised Kummer 4-folds.
15 pages, v2->v3 extensive editing and changes to the statement and proof of Theorem 3.3 (now Theorem 5.12), v3->v4 minor corrections to Theorems 4.3 and 5.7 (corresponding to Theorems 2.12 and 3.10 in v2), changes to the statement and proof of Theorem 5.12, some editing and typographical changes