Compactification of Drinfeld modular varieties and Drinfeld Modular Forms of Arbitrary Rank

Details Compactification of Drinfeld modular varieties and Drinfeld Modular Forms of Arbitrary Rank Compactification of Drinfeld modular varieties and Drinfeld Modular Forms of Arbitrary Rank

2010-07-30

arxiv.org/abs/1008.0013v4

Mathematics

Algebraic Geometry

Scientific paper

We give an abstract characterization of the Satake compactification of a general Drinfeld modular variety. We prove that it exists and is unique up to unique isomorphism, though we do not give an explicit stratification by Drinfeld modular varieties of smaller rank which is also expected. We construct a natural ample invertible sheaf on it, such that the global sections of its $k$-th power form the space of (algebraic) Drinfeld modular forms of weight $k$. We show how the Satake compactification and modular forms behave under all natural morphisms between Drinfeld modular varieties; in particular we define Hecke operators. We give explicit results in some special cases.

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