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arXiv 1608.06284hep-th
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5维$E_n$ SCFT中射线算子的指数

An Index for Ray Operators in 5d $E_n$ SCFTs

Chi-Ming Chang, Ori Ganor, Jihwan Oh

摘要:

本文构造了具有特殊整体对称性的五维超共形场论中射线支撑的BPS算子的一个指数。我们计算了低自旋算子的$E_n$表示(对于$n=2,\dots,7$),从而验证了虽然指数的表达式仅是SO $(2n-2)\times$ U(1)不变的,但指数本身表现出完全的$E_n$对称性(至少达到我们展开的阶数)。我们在5d中研究的射线算子可以被看作是杨-米尔斯理论中通过将开威尔逊线附加到夸克上而构造的算子的推广。对于$n\le 7$,与局部算子相反,它们在全局对称的$\mathbb{Z}_{9-n}\subset E_n$中心下携带非平凡电荷。因此,对于$n\le 7$,出现在射线算子指数中的表示不同于出现在先前计算的超共形指数中的表示。对于$3\le n\le 7$,我们发现索引中的首项是$E_n$的极小表示的特征标。我们还讨论的情况下,$n=8$,这提出了一个独特的技术挑战,仍然是一个悬而未决的问题。

英文摘要:

We construct an index for BPS operators supported on a ray in five dimensional superconformal field theories with exceptional global symmetries. We compute the $E_n$ representations (for $n=2,\dots,7$) of operators of low spin, thus verifying that while the expression for the index is only SO$(2n-2)\times$U(1) invariant, the index itself exhibits the full $E_n$ symmetry (at least up to the order we expanded). The ray operators we studied in 5d can be viewed as generalizations of operators constructed in a Yang-Mills theory with fundamental matter by attaching an open Wilson line to a quark. For $n\le 7$, in contrast to local operators, they carry nontrivial charge under the $\mathbb{Z}_{9-n}\subset E_n$ center of the global symmetry. The representations that appear in the ray operator index are therefore different, for $n\le 7$, from those appearing in the previously computed superconformal index. For $3\le n\le 7$, we find that the leading term in the index is a character of a minuscule representation of $E_n$. We also discuss the case $n=8$, which presents a unique technical challenge, and remains an open problem.

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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