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arXiv 1012.1437math.AGmath.AT
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超平面排列的Tate性质、多项式计数簇和单值性

Tate properties, polynomial-count varieties, and monodromy of hyperplane arrangements

Alexandru Dimca

摘要:

Milnor纤维monodromy算子的中央超平面安排的顺序示出组合确定。特别地,给出了该单值算子平凡的一个充要条件。已知复超平面排列的补是上同调的,并且如果该排列在$\Q$上定义,则具有多项式计数。我们表明,这些属性持有相应的Milnor纤维,如果单值是平凡的。构造了一个定义在$\Q$上的超平面排列,其Milnor纤维具有非平凡的monodromy算子,上同调Tate,且没有多项式计数.这样的例子不存在于低维。

英文摘要:

The order of the Milnor fiber monodromy operator of a central hyperplane arrangement is shown to be combinatorially determined. In particular, a necessary and sufficient condition for the triviality of this monodromy operator is given. It is known that the complement of a complex hyperplane arrangement is cohomologically Tate and, if the arrangement is defined over $\Q$, has polynomial count. We show that these properties hold for the corresponding Milnor fibers if the monodromy is trivial. We construct a hyperplane arrangement defined over $\Q$, whose Milnor fiber has a nontrivial monodromy operator, is cohomologically Tate, and has not polynomial count. Such examples are shown not to exist in low dimensions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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