In this chapter we classify all families C → P n of covers with a pure (1, n) – VHS. Due to Theorem 4.4.4, all these families have a dense set of CM fibers. We say that a pure (1, n) – VHS is primitive, if the (1, n) eigenspace L j satisfies that \(j \in (\mathbb Z/ (m))*\). Otherwise the pure (1, n) – VHS is derived.
In Section 6.1 we give an integral condition for the branch indices d k of the family C with the fibers given by \(y^m = (x - a_1)^{d_1}..... (x - a_n)^{d_n}.\) This integral condition is stronger than the similar integral condition INT of P. Deligne and G. D. Mostow [18]. Thus we call this strong integral condition SINT. We show that this condition is necessary for the existence of a primitive pure (1, n) – VHS. By using this condition, we compute all examples of families C → P 1 of covers with a primitive pure (1, 1) – VHS in Section 6.2, which will be listed in Section 6.3. By using the list of examples satisfying INT for n > 1 in [18], we give in Section 6.3 the complete lists of families with a primitive pure (1, n) – VHS. In Section 6.3 we give also the complete list of examples with a derived pure (1, n) - VHS, which will be verified in Section 6.4.
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© 2009 Springer-Verlag Berlin Heidelberg
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Rohde, J.C. (2009). The Computation of the Hodge Group. In: Cyclic Coverings, Calabi-Yau Manifolds and Complex Multiplication. Lecture Notes in Mathematics(), vol 1975. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00639-5_6
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DOI: https://doi.org/10.1007/978-3-642-00639-5_6
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