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arXiv 1406.7403math.AG
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有理尾超椭圆曲线模空间上的重言类

Tautological classes on the moduli space of hyperelliptic curves with rational tails

Mehdi Tavakol

摘要:

研究了亏格为$g$的稳定$n$ -尖超椭圆曲线模空间上的重言式类.我们的结果给出了重言式关系的完整描述。该方法是基于尹的方法比较重言式类的模的曲线和通用雅可比。证明了所有的关系都来自雅可比方。交叉配对被证明是完美的,在所有程度。通过圈类映射证明了重言代数与它的象在上同调下重合。后者是确定与monodromy不变类的上同调。与最近由皮克斯顿的插图的连接也进行了讨论。

英文摘要:

We study tautological classes on the moduli space of stable $n$-pointed hyperelliptic curves of genus $g$ with rational tails. Our result gives a complete description of tautological relations. The method is based on the approach of Yin in comparing tautological classes on the moduli of curves and the universal Jacobian. It is proven that all relations come from the Jacobian side. The intersection pairings are shown to be perfect in all degrees. We show that the tautological algebra coincides with its image in cohomology via the cycle class map. The latter is identified with monodromy invariant classes in cohomology. The connection with recent conjectures by Pixton is also discussed.

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