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arXiv 1109.0872hep-thmath-phmath.MP
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薛定谔西格玛模型的经典可积性和q变形Poincare对称性

Classical integrability of Schrodinger sigma models and q-deformed Poincare symmetry

Io Kawaguchi, Kentaroh Yoshida

摘要:

讨论了以三维薛定谔时空为目标空间的二维西格玛模型的经典可积结构。薛定谔时空被看作AdS_3的类零形变。由于变形,原始AdS_3等距SL(2,R)_L × SL(2,R)_R被破坏为SL(2,R)_L × U(1)_R。根据这一对称性,系统的经典动力学有两种描述:1)SL(2,R)_L描述和2)增强U(1)_R描述。在前1)中,我们证明了通过改进SL(2,R)_L Noether流实现了Yangian对称性。然后利用改进的流构造了一个拉克斯对,并通过推导r/s-矩阵代数证明了经典可积性.在后2)中,我们利用变形AdS_3的一个标度极限找到了一个非局部流,它将U(1)_R增强为一个q-变形的Poincare代数。然后给出了另一个拉克斯对,并计算了相应的r/s-矩阵.这两种描述通过非局部映射是等价的。

英文摘要:

We discuss classical integrable structure of two-dimensional sigma models which have three-dimensional Schrodinger spacetimes as target spaces. The Schrodinger spacetimes are regarded as null-like deformations of AdS_3. The original AdS_3 isometry SL(2,R)_L x SL(2,R)_R is broken to SL(2,R)_L x U(1)_R due to the deformation. According to this symmetry, there are two descriptions to describe the classical dynamics of the system, 1) the SL(2,R)_L description and 2) the enhanced U(1)_R description. In the former 1), we show that the Yangian symmetry is realized by improving the SL(2,R)_L Noether current. Then a Lax pair is constructed with the improved current and the classical integrability is shown by deriving the r/s-matrix algebra. In the latter 2), we find a non-local current by using a scaling limit of warped AdS_3 and that it enhances U(1)_R to a q-deformed Poincare algebra. Then another Lax pair is presented and the corresponding r/s-matrices are also computed. The two descriptions are equivalent via a non-local map.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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