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arXiv 1012.2054hep-th
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关于GKP类算子的包裹修正

On wrapping corrections to GKP-like operators

Matteo Beccaria, Fedor Levkovich-Maslyuk, Guido Macorini

摘要:

在最近的论文arXiv:1010.5009中,Maldacena等人通过将多边形威尔逊圈期望值或MHV振幅写为中间自由粒子交换的总和,推导出了多边形威尔逊圈期望值或MHV振幅的两个圈表达式。在两条零Wilson线之间的磁通管的激发谱可以看作是N=4 SYM或Gubser-Klebanov-Polyakov(GKP)弦的sl(2)扇区中有限扭转算符在无限自旋极限附近的激发谱。利用可积性并假设包裹校正与渐近Bethe Anastrophic贡献相比可以忽略不计,可以捕获这种状态。这个假设对于N=4 SYM背景GKP弦成立,但对于激发态值得进一步分析。在这里,我们研究GKP表兄弟考虑各种类别的(广义)扭曲运营商在β变形N=4 SYM和ABJM理论。我们证明了Gromov-Kazakov-Vieira的Y-系统在弱耦合微扰理论中很容易得到最低阶缠绕修正的精确大自旋展开式。作为一个副产品,我们确认包装更正是subleading在所有考虑的情况下。

英文摘要:

In the recent paper arXiv:1010.5009, Maldacena et al. derive the two loop expressions for polygonal Wilson loops expectation values, or MHV amplitudes, by writing them as sums over exchanges of intermediate free particles. The spectrum of excitations of the flux tube between two null Wilson lines can be viewed as the spectrum of excitations around the infinite spin limit of finite twist operators in the sl(2) sector of N=4 SYM or the Gubser-Klebanov-Polyakov (GKP) string. This regime can be captured exploiting integrability and assuming that wrapping corrections are negligible compared to asymptotic Bethe Ansatz contributions. This assumption holds true for the N=4 SYM background GKP string, but deserves further analysis for excited states. Here, we investigate GKP cousins by considering various classes of (generalized) twist operators in beta-deformed N=4 SYM and ABJM theory. We show that the Y-system of Gromov-Kazakov-Vieira easily leads to accurate large spin expansions of the wrapping correction at lowest order in weak-coupling perturbation theory. As a byproduct, we confirm that wrapping corrections are subleading in all the considered cases.

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