On varieties whose universal cover is a product of curves

Details On varieties whose universal cover is a product of curves On varieties whose universal cover is a product of curves

2008-12-23

arxiv.org/abs/0812.4317v1

Mathematics

Algebraic Geometry

22 pages, dedicated to Sommese's 60-th birthday. Greatly improves, expands and supersedes arXiv:0803.3008, of which also corre

Scientific paper

We investigate a necessary condition for a compact complex manifold X of dimension n in order that its universal cover be the Cartesian product $C^n$ of a curve $C = \PP^1 or \HH$: the existence of a semispecial tensor $\omega$. A semispecial tensor is a non zero section $ 0 \neq \omega \in H^0(X, S^n\Omega^1_X (-K_X) \otimes \eta) $), where $\eta$ is an invertible sheaf of 2-torsion (i.e., $\eta^2\cong \hol_X$). We show that this condition works out nicely, as a sufficient condition, when coupled with some other simple hypothesis, in the case of dimension $n= 2$ or $ n= 3$; but it is not sufficient alone, even in dimension 2. In the case of K\"ahler surfaces we use the above results in order to give a characterization of the surfaces whose universal cover is a product of two curves, distinguishing the 6 possible cases.

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