A three dimensional ball quotient

Details A three dimensional ball quotient A three dimensional ball quotient

2011-12-30

arxiv.org/abs/1201.0131v1

Mathematics

Algebraic Geometry

35 pages

Scientific paper

In connection with our previous investigation about Siegel threefolds which admit a Calabi--Yau model, we consider ball quotients which belong to the unitary group $\U(1,3)$. In this paper we determine a very particular example of a Picard modular variety of general type. Really we determine the ring of modular forms. This algebra has 25 generators, 15 modular forms $B_i$ of weight one and ten modular forms $C_j$ of weight 2. Both will appear as Borcherds products. We determine the ideal of relations. The forms $C_i$ are cuspidal. Their squares define holomorphic differential forms on the non-singular models.

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