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arXiv 0905.3451hep-th
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对称乘积轨道中的极值关联函数与Hurwitz数

Extremal Correlators and Hurwitz Numbers in Symmetric Product Orbifolds

Ari Pakman, Leonardo Rastelli, Shlomo S. Razamat

摘要:

研究了N个超对称四环对称乘积轨道上单圈手征算子的关联函数。扭曲算子的关联函数在覆盖曲面上进行计算,通常是不同的属,其中域是单值的。计算了一些简单的四点函数,并研究了不等分支覆盖映射的和在OPEs下如何分裂。然后我们讨论了极值n-点关联函数,即n-1手征算子和1个反手征算子的关联函数。它们服从简单的递归关系,涉及到从计数分支覆盖映射的特殊性质得到的数字。在大多数情况下,我们能够明确地解决递归关系。值得注意的是,极值关联函数等于赫尔维茨数。

英文摘要:

We study correlation functions of single-cycle chiral operators in the symmetric product orbifold of N supersymmetric four-tori. Correlators of twist operators are evaluated on covering surfaces, generally of different genera, where fields are single-valued. We compute some simple four-point functions and study how the sum over inequivalent branched covering maps splits under OPEs. We then discuss extremal n-point correlators, i.e. correlators of n-1 chiral and one anti-chiral operators. They obey simple recursion relations involving numbers obtained from counting branched covering maps with particular properties. In most cases we are able to solve explicitly the recursion relations. Remarkably, extremal correlators turn out to be equal to Hurwitz numbers.

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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