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arXiv 2006.04081math.AG
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复曲面簇与混合霍奇模的相交复形

Intersection complexes of toric varieties and mixed Hodge modules

Morihiko Saito

摘要:

证明了混合Hodge模范畴中环面簇的交复形的结构定理。这个定理是由于伯恩斯坦,Khovanskii和麦克弗森为基础的复合物与合理的系数。作为推论,非退化复曲面的欧拉示性数Hodge数可以由欧拉示性数的次全Hodge数和牛顿多面体的组合数据来确定.这是隐含地使用在一个明确的公式由Batyrev-鲍里索夫。注意,Danilov-Khovanskii已经给出了牛顿多面体的欧拉示性数小计Hodge数的公式。该结构定理还暗示了非退化环面超曲面的标准紧化的中上同调上的权滤子的分次幂函数的Hodge水平严格小于一般情况下的Hodge水平(除了中权).这给出了Danilov-Khovanskii关于非退化环面超曲面的前沿Hodge数公式的另一个证明。

英文摘要:

We prove the structure theorem of the intersection complexes of toric varieties in the category of mixed Hodge modules. This theorem is due to Bernstein, Khovanskii and MacPherson for the underlying complexes with rational coefficients. As a corollary the Euler characteristic Hodge numbers of non-degenerate toric hypersurface can be determined by the Euler characteristic subtotal Hodge numbers together with combinatorial data of Newton polyhedra. This is used implicitly in an explicit formula by Batyrev--Borisov. Note that a formula for the Euler characteristic subtotal Hodge numbers in terms of Newton polyhedra has been given by Danilov--Khovanskii. The structure theorem also implies that the graded quotients of the weight filtration on the middle cohomology of the canonical compactification of a non-degenerate toric hypersurface have Hodge level strictly smaller than the general case except for the middle weight. This gives another proof of a formula for the frontier Hodge numbers of non-degenerate toric hypersurfaces due to Danilov--Khovanskii.

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