On surfaces of general type with p_g=q=1 isogenous to a product of curves

Details On surfaces of general type with p_g=q=1 isogenous to a product of curves On surfaces of general type with p_g=q=1 isogenous to a product of curves

2006-01-04

arxiv.org/abs/math/0601063v3

Communications in Algebra 36 (2008), no. 6, 2023-2053

Mathematics

Algebraic Geometry

23 pages. To appear in Communications in Algebra

Scientific paper

A smooth algebraic surface $S$ is said to be \emph{isogenous to a product of unmixed type} if there exist two smooth curves $C, F$ and a finite group $G$, acting faithfully on both $C$ and $F$ and freely on their product, so that $S=(C \times F)/G$. In this paper we classify the surfaces of general type with $p_g=q=1$ which are isogenous to an unmixed product, assuming that the group $G$ is abelian. It turns out that they belong to four families, that we call surfaces of type $I, II, III, IV$. The moduli spaces $\mathfrak{M}_{I}, \mathfrak{M}_{II}, \mathfrak{M}_{IV}$ are irreducible, whereas $\mathfrak{M}_{III}$ is the disjoint union of two irreducible components. In the last section we start the analysis of the case where $G$ is not abelian, by constructing several examples.

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