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arXiv 1010.1683hep-thmath.RT
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N=4 SYM中BPS态的计数与构造

From counting to construction of BPS states in N=4 SYM

Jurgis Pasukonis, Sanjaye Ramgoolam

摘要:

我们描述了一个通用的元素在对称群的群代数,其字符提供了四分之一和第八BPS状态在弱耦合N=4 SYM,细化根据全球对称群的表示计数。一个相关的投影机作用于希尔伯特空间的自由理论是用来构造矩阵的两点函数的状态湮灭的单圈扩张算子,在有限的N或在大N的限制。该矩阵简单地由对称群的Clebsch-Gordan系数和U(N)表示的维数给出。根据非重整化定理,它应该包含强耦合的观测量。利用弦不相容原理,我们用巨引力子解释了它的一类本征值和本征向量。我们还给出了单圈伸缩算子在自由理论的正交基上的作用量公式,该作用量在整体对称性下是明显协变的。

英文摘要:

We describe a universal element in the group algebra of symmetric groups, whose characters provides the counting of quarter and eighth BPS states at weak coupling in N=4 SYM, refined according to representations of the global symmetry group. A related projector acting on the Hilbert space of the free theory is used to construct the matrix of two-point functions of the states annihilated by the one-loop dilatation operator, at finite N or in the large N limit. The matrix is given simply in terms of Clebsch-Gordan coefficients of symmetric groups and dimensions of U(N) representations. It is expected, by non-renormalization theorems, to contain observables at strong coupling. Using the stringy exclusion principle, we interpret a class of its eigenvalues and eigenvectors in terms of giant gravitons. We also give a formula for the action of the one-loop dilatation operator on the orthogonal basis of the free theory, which is manifestly covariant under the global symmetry.

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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