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Vanishing cohomology on a double cover

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arxiv 1807.02646 v2 pith:VNPCVECD submitted 2018-07-07 math.AG

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keywords coverdoublegeneraltheoryveryamplebranchedcohomology
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abstract

In this paper, we prove the irreducibility of the monodromy action on the anti-invariant part of the vanishing cohomology on a double cover of a very general element in an ample hypersurface of a complex smooth projective variety branched at an ample divisor. As an application, we study dominant rational maps from a double cover of a very general surface $S$ of degree$\geq 7$ in ${\mathbb P}^3$ branched at a very general quadric surface to smooth projective surfaces $Z$. Our method combines the classification theory of algebraic surfaces, deformation theory, and Hodge theory.

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  1. Morphisms from a very general hypersurface

    math.AG 2019-08 conditional novelty 7.0 of 10

    For a very general hypersurface of degree d at least n+3 in P^{n+1}, any dominant rational map of prime degree to a smooth projective n-fold has a uniruled target, and the target is rationally connected when n is at most 3.

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