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arXiv 0905.2273hep-th
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具有大R-荷算子的关联函数

Correlators Of Operators with a Large R-charge

Robert de Mello Koch, Tanay K. Dey, Norman Ives, Michael Stephanou

摘要:

共形维数为O(N^2)的算子的关联函数不能很好地用平面极限来近似。非平面图,在体时空中对应于弦环修正,被巨大的组合因子增强。在这篇文章中,我们将展示如何对这些环路校正进行图解。作为我们结果的一个典型例子,在半BPS背景下的M极大巨引力子中,我们发现通常的1/N展开式被1/(M+N)展开式所取代。进一步,我们发现在平凡背景下计算的振幅和在M极大巨引力子背景下计算的振幅之间存在简单的精确关系。最后,我们还发现了arXiv:0801.4457中提出的BMN型行业的有力证据。arXiv:0801.4457的退耦极限捕获了相交巨引力子系统的退耦低能世界体积理论,并且即使当原始N=4的超级杨-米尔斯理论是强耦合的时,该理论也是弱耦合的。

英文摘要:

Correlation functions of operators with a conformal dimension of O(N^2) are not well approximated by the planar limit. The non-planar diagrams, which in the bulk spacetime correspond to string loop corrections, are enhanced by huge combinatorial factors. In this article we show how these loop corrections can be resummed. As a typical example of our results, in the half-BPS background of M maximal giant gravitons we find the usual 1/N expansion is replaced by a 1/(M+N) expansion. Further, we find that there is a simple exact relationship between amplitudes computed in the trivial background and amplitudes computed in the background of M maximal giant gravitons. Finally, we also find strong evidence for the BMN-type sectors suggested in arXiv:0801.4457. The decoupling limit of arXiv:0801.4457 captures the decoupled low energy world volume theory of the intersecting giant graviton system and this theory is weakly coupled even when the original N=4 super Yang-Mills theory is strongly coupled.

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