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arXiv 1208.0132math.AGmath.ACmath.NTmath.RT
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通过母题积分研究p-循环McKay对应

The $p$-cyclic McKay correspondence via motivic integration

Takehiko Yasuda

AI总结:

本文利用推广到商栈的母题积分研究特征p下p阶循环群表示的McKay对应,显式计算了商簇的弦不变量,并证明crepant解消的拓扑欧拉特征数为p,同时将其与Artin-Schreier扩张的计数建立联系。

摘要:

我们研究特征p下p阶循环群表示的McKay对应。主要工具是推广到与表示相关的商栈的母题积分。我们的变量替换公式版本导致了对商簇的弦不变量进行显式计算。一个推论是,商簇的crepant解消(如果存在)具有拓扑欧拉特征数p,与tame情形相同。此外,我们将crepant解消与幂级数域的Artin-Schreier扩张的计数联系起来,该计数关于由分歧跳跃和表示确定的权重进行。

英文摘要:

We study the McKay correspondence for representations of the cyclic group of order $p$ in characteristic $p$. The main tool is the motivic integration generalized to quotient stacks associated to representations. Our version of the change of variables formula leads to an explicit computation of the stringy invariant of the quotient variety. A consequence is that a crepant resolution of the quotient variety (if any) has topological Euler characteristic $p$ like in the tame case. Also, we link a crepant resolution with a count of Artin-Schreier extensions of the power series field with respect to weights determined by ramification jumps and the representation.

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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