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arXiv 1407.2840hep-th
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对称空间上弦的可积变形

Integrable Deformations of Strings on Symmetric Spaces

Timothy J. Hollowood, J. Luis Miramontes, David M. Schmidtt

摘要:

本文给出了具有对称空间F/G目标空间的可积σ模型的一类一般变形,这些变形包括定义σ模型的非交换T对偶,然后用规范F/FWZW模型代替影响平坦性的Lagrange乘子的耦合。在大能级极限下得到了原始σ模型。由此产生的变形理论示出保持可积性和运动方程,但涉及变形的辛结构。它表明,这种变形辛结构涉及到一个线性组合的原始泊松括号和推广的Faddeev-Reshetikhin泊松括号,我们可以重新表示为两个解耦的F电流代数。然后,它表明,变形可以被纳入到经典模型的字符串R × F/G通过推广的Pohlmeyer减少。在这种情况下,在大σ模型耦合的限制下,它表明,该理论成为相对论对称空间sine-Gordon理论。这些结果表明,AdS 5 × S5上的完全格林-施瓦茨超弦存在这种变形。

英文摘要:

A general class of deformations of integrable sigma-models with symmetric space F/G target-spaces are found. These deformations involve defining the non-abelian T dual of the sigma-model and then replacing the coupling of the Lagrange multiplier imposing flatness with a gauged F/F WZW model. The original sigma-model is obtained in the limit of large level. The resulting deformed theories are shown to preserve both integrability and the equations-of-motion, but involve a deformation of the symplectic structure. It is shown that this deformed symplectic structure involves a linear combination of the original Poisson bracket and a generalization of the Faddeev-Reshetikhin Poisson bracket which we show can be re-expressed as two decoupled F current algebras. It is then shown that the deformation can be incorporated into the classical model of strings on R x F/G via a generalization of the Pohlmeyer reduction. In this case, in the limit of large sigma-model coupling it is shown that the theory becomes the relativistic symmetric space sine-Gordon theory. These results point to the existence of a deformation of this kind for the full Green-Schwarz superstring on AdS5 x S5.

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