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arXiv 0809.4038hep-th
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AdS_4 x CP ^3中的量子自旋弦:Bethe Anglands方案的检验

Quantum spinning strings in AdS_4 x CP^3: testing the Bethe Ansatz proposal

Tristan McLoughlin, Radu Roiban, Arkady A. Tseytlin

摘要:

最近,人们提出了一个渐近Bethe Answer,它可以描述AdS_4 x CP ^3中与量子超弦对偶的N=6超对称三维Chern-Simons物质理论中“长”算符的反常维数。它最初通过了一些一致性检查,但随后与单圈弦理论计算的直接比较引起了一些争议。这里我们提出一个解决方案,指出与基于代数曲线考虑的初始假设相反,进入BMN或磁振子色散关系的中心插值函数h(λ)在自然弦理论计算方案中得到非零的单圈修正。我们考虑一个在AdS_5 × S^5情形中已经起了关键作用的基本例子:一个刚性圆弦,它既在AdS_4中伸展,又沿着CP^3的S^1伸展,并且带有两个自旋。计算其能量的主要单圈量子修正使我们能够确定h(λ)中的常数单圈项,并建议如何建立与贝特安托建议的对应关系,包括非平凡的单圈相位因子。我们讨论了一些问题,仍然在试图匹配的一部分世界片的贡献(敏感的弦方向的紧凑性)和他们的贝特Anglesia同行。

英文摘要:

Recently, an asymptotic Bethe Ansatz that is claimed to describe anomalous dimensions of "long" operators in the planar N=6 supersymmetric three-dimensional Chern-Simons-matter theory dual to quantum superstrings in AdS_4 x CP^3 was proposed. It initially passed a few consistency checks but subsequent direct comparison to one-loop string-theory computations created some controversy. Here we suggest a resolution by pointing out that, contrary to the initial assumption based on the algebraic curve considerations, the central interpolating function h(λ) entering the BMN or magnon dispersion relation receives a non-zero one-loop correction in the natural string-theory computational scheme. We consider a basic example which has already played a key role in the AdS_5 x S^5 case: a rigid circular string stretched in both AdS_4 and along an S^1 of CP^3 and carrying two spins. Computing the leading one-loop quantum correction to its energy allows us to fix the constant one-loop term in h(λ) and also to suggest how one may establish a correspondence with the Bethe Ansatz proposal, including the non-trivial one-loop phase factor. We discuss some problems which remain in trying to match a part of world-sheet contributions (sensitive to compactness of the string direction) and their Bethe Ansatz counterparts.

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