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arXiv 1105.4983math.AG
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p_g=q=2,K^2=6的二次Albanese映射曲面

Surfaces with p_g=q=2, K^2=6 and Albanese map of degree 2

Matteo Penegini, Francesco Polizzi

摘要:

我们将一般型极小曲面$S$分类为$p_g=q=2$和$K_S^2=6$,它们的Albanese映射是一般有限的双覆盖.我们证明了相应的模空间是三个一般光滑的不可约的4维、4维、3维分支$\mathcal{M}_{Ia}$、$\mathcal{M}_{Ib}$、$\mathcal{M}_{II}$的不交并.一般曲面$S$包含一条光滑椭圆曲线$Z$,使得$Z^2=-2$,它被Albanese映射压缩,并且被任何一阶变形保持。

英文摘要:

We classify minimal surfaces $S$ of general type with $p_g=q=2$ and $K_S^2=6$ whose Albanese map is a generically finite double cover. We show that the corresponding moduli space is the disjoint union of three generically smooth, irreducible components $\mathcal{M}_{Ia}$, $\mathcal{M}_{Ib}$, $\mathcal{M}_{II}$ of dimension 4, 4, 3, respectively. The general surface $S$ contains a smooth elliptic curve $Z$ such that $Z^2=-2$, which is contracted by the Albanese map and which is preserved by any first-order deformation.

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