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arXiv 0907.1567hep-th
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N=4 SYM中的算子混合与三点函数

Operator mixing and three-point functions in N=4 SYM

George Georgiou, Valeria L. Gili, Rodolfo Russo

摘要:

研究了N=4的超杨-米尔斯理论中两个BPS定域规范不变算符与一个非BPS定域规范不变算符之间的三点函数。特别是,我们表明,在明确的1-循环的例子中,在arXiv:0810.0499中讨论的算子混合起着重要的作用,在计算的交换子,是必要的,以消除贡献,将违反以下的约束从超共形和奖金U(1)_Y对称性。我们还利用AdS_5 xS^5弦论的BMN极限分析了强耦合下的同类型的量子化子。同样,具有不同类型杂质的状态之间的混合对于确保消除可能违反上述约束的各种振幅至关重要。然而,在弦方面,我们也发现了一个非BPS态和两个BPS态之间的相互作用的一些例子,它们不满足基于超共形和奖励U(1)_Y对称性的预期。

英文摘要:

We study the three-point functions between two BPS and one non-BPS local gauge invariant operators in N=4 Super Yang-Mills theory. In particular we show, in explicit 1-loop examples, that the operator mixing discussed in arXiv:0810.0499 plays an important role in the computations of the correlators and is necessary to cancel contributions that would violate the constraints following from the superconformal and the bonus U(1)_Y symmetries. We analyse the same type of correlators also at strong coupling by using the BMN limit of the AdS_5xS^5 string theory. Again the mixing between states with different types of impurities is crucial to ensure the cancellation of various amplitudes that would violate the constraints mentioned above. However, on the string side, we also find some examples of interactions between one non-BPS and two BPS states that do not satisfy expectations based on the superconformal and the bonus U(1)_Y symmetries.

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