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arXiv 0705.0890hep-th
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量子弦Bethe尺度函数的强耦合极限

The Strong Coupling Limit of the Scaling Function from the Quantum String Bethe Ansatz

P. Y. Casteill, C. Kristjansen

摘要:

利用量子弦Bethe不等式,我们导出了在1 << J << S,z=λ^(1/2)log(S/J)/(πJ)固定的极限下,以角动量(S,J)在AdS_3 x S^1中转动的折叠弦的单圈能量。单圈能量是两个贡献的总和,一个来自于Hernandel-Lopez相,另一个是由于自旋链有限尺寸效应。我们发现一个结果,在功能水平上完全匹配的结果的弦论计算。将结果推广到大z时,我们得到了N=4 SYM的SL(2)扇区的低扭曲、高自旋算符标度函数的强耦合极限。特别地,我们恢复了著名的-3 log(2)/π。它的出现是有限尺寸效应和Hernanove-Lopez修正之间的非平凡抵消的结果。

英文摘要:

Using the quantum string Bethe ansatz we derive the one-loop energy of a folded string rotating with angular momenta (S,J) in AdS_3 x S^1 inside AdS_5 x S^5 in the limit 1 << J << S, z=λ^(1/2) log(S/J) /(πJ) fixed. The one-loop energy is a sum of two contributions, one originating from the Hernandez-Lopez phase and another one being due to spin chain finite size effects. We find a result which at the functional level exactly matches the result of a string theory computation. Expanding the result for large z we obtain the strong coupling limit of the scaling function for low twist, high spin operators of the SL(2) sector of N=4 SYM. In particular we recover the famous -3 log(2)/π. Its appearance is a result of non-trivial cancellations between the finite size effects and the Hernandez-Lopez correction.

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