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arXiv 1206.0813hep-th
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两圈处的非平面可积性

Nonplanar integrability at two loops

Robert de Mello Koch, Garreth Kemp, Badr Awad Elseid Mohammed, Stephanie Smith

摘要:

本文在位移角点近似下计算了双圈伸缩算子对属于su(2)扇区的限制Schur多项式的作用。在这个非平面的大N极限中,对角化一个循环扩张算子的算子在两个循环处不被校正。由此产生的光谱异常尺寸是相关的一组去耦谐振子,表明在这一部门的理论在两个循环的可积性。反常维数是特胡夫特耦合的非平凡函数,其谱在大N时是连续的,从零开始,但在有限N时是离散的。

英文摘要:

In this article we compute the action of the two loop dilatation operator on restricted Schur polynomials that belong to the su(2) sector, in the displaced corners approximation. In this non-planar large N limit, operators that diagonalize the one loop dilatation operator are not corrected at two loops. The resulting spectrum of anomalous dimensions is related to a set of decoupled harmonic oscillators, indicating integrability in this sector of the theory at two loops. The anomalous dimensions are a non-trivial function of the 't Hooft coupling, with a spectrum that is continuous and starting at zero at large N, but discrete at finite N.

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