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arXiv 0903.4277hep-th
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二维共形流代数

Conformal Current Algebra in Two Dimensions

Sujay K. Ashok, Raphael Benichou, Jan Troost

摘要:

我们构造了一个二维非手征流代数,它与共形不变性一致。我们表明,共形电流代数实现在超群流形上的非线性西格玛模型与消失的对偶Coxeter数,有或没有Wess-Zumino项。当前代数使用两种不同的方法计算。首先,我们利用特殊的代数性质的超群计算精确的两点和三点的功能的电流,并从他们推断当前的代数。利用Wess-Zumino-Witten点的共形扰动理论,通过对扰动级数的简化,计算了该代数.我们还证明了这些模型实现了一个非手征的卡茨-穆迪代数,并构造了一个在Kac-Moody生成元作用下封闭的交换算子的无限集合.我们考虑的超群模型包括应用于统计力学、凝聚态和弦论的模型。特别是,我们的结果有助于系统地解决和阐明PSU(n)的量子可积性|n)模型及其陪集,它们在反deSitter空间上的弦世界表模型中表现突出。

英文摘要:

We construct a non-chiral current algebra in two dimensions consistent with conformal invariance. We show that the conformal current algebra is realized in non-linear sigma-models on supergroup manifolds with vanishing dual Coxeter number, with or without a Wess-Zumino term. The current algebra is computed using two distinct methods. First we exploit special algebraic properties of supergroups to compute the exact two- and three-point functions of the currents and from them we infer the current algebra. The algebra is also calculated by using conformal perturbation theory about the Wess-Zumino-Witten point and resumming the perturbation series. We also prove that these models realize a non-chiral Kac-Moody algebra and construct an infinite set of commuting operators that is closed under the action of the Kac-Moody generators. The supergroup models that we consider include models with applications to statistical mechanics, condensed matter and string theory. In particular, our results may help to systematically solve and clarify the quantum integrability of PSU(n|n) models and their cosets, which appear prominently in string worldsheet models on anti-deSitter spaces.

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