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arXiv 1010.3229hep-th
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扭S-矩阵的扭Bethe方程

Twisted Bethe equations from a twisted S-matrix

Changrim Ahn, Zoltan Bajnok, Diego Bombardelli, Rafael I. Nepomechie

摘要:

Beisert和Roiban已经提出了AdS 5/CFT 4的3参数变形的全回路渐近Bethe方程。我们提出了一个Drinfeld扭曲的AdS 5/CFT 4的S-矩阵,连同c-数对角扭曲的边界条件,从中我们得到这些Bethe方程。尽管未变形的S-矩阵可分解为两个su(2)的积|2)因子,变形S-矩阵不能被因子分解。对角化的相应的传输矩阵需要一个常规的代数Bethe anomaly的方法,我们首先说明了扭曲的su(2)主手征模型的简单情况下的推广。我们还证明了同样的扭曲Bethe方程可以交替地使用非扭曲S-矩阵和边界条件与操作扭曲。

英文摘要:

All-loop asymptotic Bethe equations for a 3-parameter deformation of AdS5/CFT4 have been proposed by Beisert and Roiban. We propose a Drinfeld twist of the AdS5/CFT4 S-matrix, together with c-number diagonal twists of the boundary conditions, from which we derive these Bethe equations. Although the undeformed S-matrix factorizes into a product of two su(2|2) factors, the deformed S-matrix cannot be so factored. Diagonalization of the corresponding transfer matrix requires a generalization of the conventional algebraic Bethe ansatz approach, which we first illustrate for the simpler case of the twisted su(2) principal chiral model. We also demonstrate that the same twisted Bethe equations can alternatively be derived using instead untwisted S-matrices and boundary conditions with operatorial twists.

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