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arXiv 1406.2299math.AG
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约化曲线的细紧化Jacobi算子

Fine compactified Jacobians of reduced curves

Margarida Melo, Antonio Rapagnetta, Filippo Viviani

摘要:

对于每一个奇异的约化射影曲线X,可以根据X上的极化的选择,将许多精细的紧化雅可比矩阵关联起来,每个雅可比矩阵产生X的广义雅可比矩阵的不交并的模紧化。我们研究了具有局部平面奇点的精细紧化雅可比曲线的几何性质。我们给出的例子节点曲线承认非同构(甚至非同胚的领域的复数)精细紧化雅可比。研究了曲线X的半泛变形空间上的泛精细紧化Jacobian,即相对精细紧化Jacobian。最后,我们研究了值在适当的细紧化Jacobian中的扭曲Abel映射的存在性。

英文摘要:

To every singular reduced projective curve X one can associate many fine compactified Jacobians, depending on the choice of a polarization on X, each of which yields a modular compactification of a disjoint union of the generalized Jacobian of X. We investigate the geometric properties of fine compactified Jacobians focusing on curves having locally planar singularities. We give examples of nodal curves admitting non isomorphic (and even non homeomorphic over the field of complex numbers) fine compactified Jacobians. We study universal fine compactified Jacobians, which are relative fine compactified Jacobians over the semiuniversal deformation space of the curve X. Finally, we investigate the existence of twisted Abel maps with values in suitable fine compactified Jacobians.

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