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arXiv 1107.2644math.AG
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与曲面退化有关的例外丛

Exceptional bundles associated to degenerations of surfaces

Paul Hacking

摘要:

1981年,J. Wahl描述了没有消失圈的曲面商奇点的光滑化。给定一个这类射影曲面X的光滑化,在H^{2,0}(Y)=H^1(Y)=0的情形下,我们在邻近纤维Y上构造一个相关的例外向量丛。如果Y是射影平面,我们表明,我们的建设建立了一个双射之间的可能退化的表面X和例外束Y模对偶和张紧的线丛。如果Y是一般型的,则我们的构造建立了等价于Y的曲面变形的模空间的边界分量与Y上的例外丛之间的联系。

英文摘要:

In 1981 J. Wahl described smoothings of surface quotient singularities with no vanishing cycles. Given a smoothing of a projective surface X of this type, we construct an associated exceptional vector bundle on the nearby fiber Y in the case H^{2,0}(Y)=H^1(Y)=0. If Y is the projective plane we show that our construction establishes a bijective correspondence between the possible degenerate surfaces X and exceptional bundles on Y modulo dualizing and tensoring by line bundles. If Y is of general type then our construction establishes a connection between components of the boundary of the moduli space of surfaces deformation equivalent to Y and exceptional bundles on Y.

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