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arXiv 0812.2305math.AGmath.CVmath.DG
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正则极化簇模叠加的曲面结构和三重映射

The structure of surfaces and threefolds mapping to the moduli stack of canonically polarized varieties

Stefan Kebekus, Sandor J. Kovacs

摘要:

Viehweg推广了著名的Shafarevich双曲性猜想,证明了一个准投射流形如果允许正则极化簇的模栈具有一般的有限态射,则它必然是log一般型的.给定一个准射影三重Y,允许一个非常数映射到模栈,我们采用对数复数形式的扩展性质,建立一个强有力的关系之间的模映射和Y的极小模型程序:在所有相关的情况下,极小模型程序导致一个纤维空间的纤维化因子的模映射。一个更精细肯定的回答维韦格的猜想家庭超过三倍以下作为一个推论。对于曲面上的族,模映射通常可以非常明确地描述。稍弱的结果得到家庭的品种平凡,或更一般的半充足的典范丛。

英文摘要:

Generalizing the well-known Shafarevich hyperbolicity conjecture, it has been conjectured by Viehweg that a quasi-projective manifold that admits a generically finite morphism to the moduli stack of canonically polarized varieties is necessarily of log general type. Given a quasi-projective threefold Y that admits a non-constant map to the moduli stack, we employ extension properties of logarithmic pluri-forms to establish a strong relationship between the moduli map and the minimal model program of Y: in all relevant cases the minimal model program leads to a fiber space whose fibration factors the moduli map. A much refined affirmative answer to Viehweg's conjecture for families over threefolds follows as a corollary. For families over surfaces, the moduli map can be often be described quite explicitly. Slightly weaker results are obtained for families of varieties with trivial, or more generally semi-ample canonical bundle.

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