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arXiv 1208.4548hep-th
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关联函数的χ-系

χ-Systems for Correlation Functions

J. Caetano, J. Toledo

摘要:

我们考虑了N=4 SYM中重算子的四点函数与AdS中无自旋弦对偶的强耦合极限。我们只讨论插入到一行上的运算符。弦计算分解成一个依赖于状态的球体部分和一个只依赖于算子维数和交比的通用AdS贡献。我们使用AdS弦方程的可积性来计算任意共形维数的算子的AdS部分。该解决方案采取TBA的积分方程的形式与最小的AdS字符串的行动计算相应的自由能功能。这些TBA类方程源于一个特殊的函数方程系统,我们称之为χ-系统。原则上,可以使用相同的方法来求解N点函数中的AdS贡献。这个解的一个有趣的特点是它编码了对应于不同经典鞍点的多重弦构型。参数化这些解决方案的离散数据通过TBA类方程中化学势的模拟进入。最后,对于与在S^5中同一赤道上自旋的弦对偶的算子(即相同类型的BPS算子),球部分的计算很简单。在这种情况下(一般既不是极值也不是保护的),我们可以构造完整的强耦合4点函数。

英文摘要:

We consider the strong coupling limit of 4-point functions of heavy operators in N=4 SYM dual to strings with no spin in AdS. We restrict our discussion for operators inserted on a line. The string computation factorizes into a state-dependent sphere part and a universal AdS contribution which depends only on the dimensions of the operators and the cross ratios. We use the integrability of the AdS string equations to compute the AdS part for operators of arbitrary conformal dimensions. The solution takes the form of TBA-like integral equations with the minimal AdS string-action computed by a corresponding free-energy-like functional. These TBA-like equations stem from a peculiar system of functional equations which we call a χ-system. In principle one could use the same method to solve for the AdS contribution in the N-point function. An interesting feature of the solution is that it encodes multiple string configurations corresponding to different classical saddle-points. The discrete data that parameterizes these solutions enters through the analog of the chemical-potentials in the TBA-like equations. Finally, for operators dual to strings spinning in the same equator in S^5 (i.e. BPS operators of the same type) the sphere part is simple to compute. In this case (which is generically neither extremal nor protected) we can construct the complete, strong-coupling 4-point function.

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