Mathematics – Algebraic Geometry
Scientific paper
2005-12-21
Mathematics
Algebraic Geometry
23 p
Scientific paper
For certain complex projective manifolds (such as K3 surfaces and their higher dimensional analogues, the complex symplectic projective manifolds) the period map takes values in a locally symmetric variety of type IV. It is often an open embedding and in such cases it has been observed that the image is the complement of a locally symmetric (Heegner) divisor. We explain that phenomenon and get our hands on the complementary divisor in terms of geometric data.
Looijenga Eduard
Swierstra Rogier
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