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arXiv 1601.02871math.AG
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Pixton双分歧圈关系

Pixton's double ramification cycle relations

Emily Clader, Felix Janda

摘要:

我们证明了Pixton的一个猜想,即他提出的关于Mbar_{g,n}上的二重分歧环的公式在余维g之外为零.这产生了Mbar_{g,n}的Chow环中重言式关系的集合。此外,我们描述了如何从Pixton的3-自旋关系,通过本地化的模空间的稳定映射到一个orbifold投影线,这些关系可以得到。

英文摘要:

We prove a conjecture of Pixton, namely that his proposed formula for the double ramification cycle on Mbar_{g,n} vanishes in codimension beyond g. This yields a collection of tautological relations in the Chow ring of Mbar_{g,n}. We describe, furthermore, how these relations can be obtained from Pixton's 3-spin relations via localization on the moduli space of stable maps to an orbifold projective line.

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