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arXiv 0712.3549hep-th
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超空间西格玛模型中的边界谱

Boundary Spectra in Superspace Sigma-Models

Thomas Quella, Volker Schomerus, Thomas Creutzig

摘要:

本文计算了超群PSL(2)上西格玛模型中D-瞬子的精确边界谱|2)。我们的结果是通过一个显式的总和的共形尺寸的曲率半径的所有订单的微扰展开。该分析利用了PSL(2)上度量的重新标度所引起的扰动级数的几个显著性质|2)相对于固定的Wess-Zumino项。根据Berkovits,Vafa和Witten的说法,这些模型在具有非零RR通量的AdS 3上的弦论的背景下是相关的。本说明最后对其他超群和高维超陪集理论的各种可能的推广提出了一些评论。

英文摘要:

In this note we compute exact boundary spectra for D-instantons in sigma-models on the supergroup PSL(2|2). Our results are obtained through an explicit summation of the perturbative expansion for conformal dimensions to all orders in the curvature radius. The analysis exploits several remarkable properties of the perturbation series that arises from rescalings of the metric on PSL(2|2) relative to a fixed Wess-Zumino term. According to Berkovits, Vafa and Witten, the models are relevant in the context of string theory on AdS3 with non-vanishing RR-flux. The note concludes with a number of comments on various possible generalizations to other supergroups and higher dimensional supercoset theories.

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