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arXiv math/0605093math.AGmath.CV
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光滑族与极化流形的模空间的紧化

Compactifications of smooth families and of moduli spaces of polarized manifolds

Eckart Viehweg

摘要:

设M是具有Hilbert多项式h的正则极化流形的模概型。对于给定的自然数m>1且h(m)>0的有限集I,我们构造了M下的约化概形的一个射影紧化M',使得对应于模栈上相对对偶层的m次幂的直像的行列式的丰富可逆层L,具有到M'的自然扩张L'.一个类似的结果示出的偏振极小模型的Kodaira尺寸为零的模量。在这两种情况下,“自然”意味着由族f:X --> C诱导的L'到曲线C --> M'的拉回同构于相对对偶层的m次幂的直接像的行列式,只要f是半稳定族的双有理。除了弱半稳定约化的Abramovich-Karu和扩展定理的Gabber有新的工具,希望感兴趣的本身。特别是我们需要一个定理的平坦化的乘子层在家庭中,他们的兼容性与拉回和基地的变化,其直接图像,扭曲了某些半样本层。根据一位裁判的建议,我们重新组织了这篇文章,我们添加了一些注释来解释证明的主线,并且我们稍微改变了一些符号。

英文摘要:

Let M be the moduli scheme of canonically polarized manifolds with Hilbert polynomial h. We construct for a given finite set I of natural numbers m>1 with h(m)>0 a projective compactification M' of the reduced scheme underlying M such that the ample invertible sheaf L corresponding to the determinant of the direct image of the m-th power of the relative dualizing sheaf on the moduli stack, has a natural extension L' to M'. A similar result is shown for moduli of polarized minimal models of Kodaira dimension zero. In both cases "natural" means that the pullback of L' to a curve C --> M', induced by a family f:X --> C is isomorphic to the determinant of the direct image of the m-th power of the relative dualizing sheaf whenever f is birational to a semi-stable family. Besides of the weak semistable reduction of Abramovich-Karu and the extension theorem of Gabber there are new tools, hopefully of interest by itself. In particular we will need a theorem on the flattening of multiplier sheaves in families, on their compatibility with pullbacks and on base change for their direct images, twisted by certain semiample sheaves. Following suggestions of a referee, we reorganized the article, we added several comments explaining the main line of the proof, and we changed notations a little bit.

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