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arXiv 0806.1911hep-th
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对角自由场矩阵关联函数、整体对称性与巨引力子

Diagonal free field matrix correlators, global symmetries and giant gravitons

T. W. Brown, P. J. Heslop, S. Ramgoolam

摘要:

在整体对称群G的理论中,得到了对角自由场多矩阵2-点关联函数的一个基。这些算子都是G的不可约表示。这适用于有限N处的规范群U(N)。对于由n个基本场组成的复合场,这用Clebsch-Gordan系数表示,用于将基本场表示的n重张量积分解为G \times S_n表示。我们在\cN =4 SYM的SL(2)扇区的情况下使用该一般构造。在这种情况下,通过构造振子,我们将SL(2)的相关的Clebsch-Gordans耦合无穷维离散级数非线性表示的计算归结为对称群中的问题.应用这些建设,我们写下规范不变的运营商与Fock空间结构类似,产生在一个大角动量极限的世界体积激发的巨引力子。Fock空间结构来自对称群表示的张量积的Clebsch多重性。并在此基础上给出了\cN =4 SYM的单圈扩张算子的作用.

英文摘要:

We obtain a basis of diagonal free field multi-matrix 2-point correlators in a theory with global symmetry group G. The operators fall into irreducible representations of G. This applies for gauge group U(N) at finite N. For composites made of n fundamental fields, this is expressed in terms of Clebsch-Gordan coefficients for the decomposition of the n-fold tensor products of the fundamental field representation in terms of G \times S_n representations. We use this general construction in the case of the SL(2) sector of \cN=4 SYM. In this case, by using oscillator constructions, we reduce the computation of the relevant Clebsch-Gordans coupling infinite dimensional discrete series irreps of SL(2) to a problem in symmetric groups. Applying these constructions we write down gauge invariant operators with a Fock space structure similar to that arising in a large angular momentum limit of worldvolume excitations of giant gravitons. The Fock space structure emerges from Clebsch multiplicities of tensor products of symmetric group representations. We also give the action of the 1-loop dilatation operator of \cN=4 SYM on this basis of multi-matrix operators.

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