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arXiv 0712.0615hep-th
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二维引力陪集模型的无穷维对称性

Infinite-Dimensional Symmetries of Two-Dimensional Coset Models Coupled to Gravity

M. J. Perry, H. Lu, C. N. Pope

摘要:

在以前的一篇论文中,我们研究了平坦二维时空中无限维空间西格玛模型(SSM)的对称性。在这里,我们扩展我们的调查的情况下,二维SSM耦合到重力。这些理论产生于将高维引力和超引力降维为二维的环面理论。我们构造显式表达式的仿射卡茨-穆迪扩展$\hat G$,从G/H陪集模型时产生的对称变换。我们还进一步构造了对应于Virasoro子代数的模L_n的显式对称变换,这些模L_n是由$n\ge -1$构成的.

英文摘要:

In an earlier paper we studied the infinite-dimensional symmetries of symmetric-space sigma models (SSMs) in a flat two-dimensional spacetime. Here, we extend our investigation to the case of two-dimensional SSMs coupled to gravity. These theories arise from the toroidal reduction of higher-dimensional gravity and supergravities to two dimensions. We construct explicit expressions for the symmetry transformations under the affine Kac-Moody extension $\hat G$ that arises when starting from a G/H coset model. We also construct further explicit symmetry transformations that correspond to the modes L_n of a Virasoro subalgebra with $n\ge -1$.

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