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arXiv math/0303111math.AG
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Q-Gorenstein簇的弦zeta函数

Stringy zeta functions for Q-Gorenstein varieties

Willem Veys

摘要:

弦欧拉数和弦E-函数是Batyrev提出的对数终端奇点的有趣不变量。他用它们来制定一个拓扑镜像对称测试对某些卡-丘品种,并显示了一个版本的麦凯对应。这是一个自然的问题,是否可以扩展这些不变量超出日志终端的情况。假设的极小模型计划,我们引入了非常一般的弦不变量,与“几乎所有”奇点,更确切地说,所有的奇点不是严格的日志规范。当奇点是对数终端时,他们专门研究Batyrev的不变量。例如,我们的弦zeta函数的最简单形式通常是一个单变量的有理函数,但在对数终端情况下,它只是一个常数(Batyrev的弦欧拉数)。

英文摘要:

The stringy Euler number and stringy E-function are interesting invariants of log terminal singularities, introduced by Batyrev. He used them to formulate a topological mirror symmetry test for pairs of certain Calabi-Yau varieties, and to show a version of the McKay correspondence. It is a natural question whether one can extend these invariants beyond the log terminal case. Assuming the Minimal Model Program, we introduce very general stringy invariants, associated to 'almost all' singularities, more precisely to all singularities which are not strictly log canonical. They specialize to the invariants of Batyrev when the singularity is log terminal. For example the simplest form of our stringy zeta function is in general a rational function in one variable, but it is just a constant (Batyrev's stringy Euler number) in the log terminal case.

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