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arXiv 1502.05776hep-th
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基于拓扑界面的非几何背景

Non-geometric Backgrounds Based on Topological Interfaces

Yuji Satoh, Yuji Sugawara

摘要:

我们研究简单的模型的世界片CFTs描述非几何背景的拓扑接口的基础上,“胶合条件”,其中规定T-对偶或类似的扭曲。更具体地说,我们从目标空间S^1 [base] x(S^1 x S^1)[fiber]上的环面配分函数开始,该空间具有相当一般的半径值。根据基圆的缠绕数,通过插入由拓扑界面组成的扭曲算子,定义了纤维CFT,这些拓扑界面沿着世界片环面的圈。我们构造了包含这种对偶扭曲的配分函数。模不变性是直接实现的,而“么正化”一般是保持么正性所必需的。我们证明了它的情况下,相等的纤维半径。所得的模型与离散扭转的CFTs密切相关。幺正化也被物理解释为沿着不同方向的扭曲/界面算子的多次插入。

英文摘要:

We study simple models of the world-sheet CFTs describing non-geometric backgrounds based on the topological interfaces, the `gluing condition' of which imposes T-duality- or analogous twists. To be more specific, we start with the torus partition function on a target space S^1 [base] x (S^1 x S^1) [fiber] with rather general values of radii. The fiber CFT is defined by inserting the twist operators consisting of the topological interfaces which lie along the cycles of the world-sheet torus according to the winding numbers of the base circle. We construct the partition functions involving such duality twists. The modular invariance is achieved straightforwardly, whereas `unitarization' is generically necessary to maintain the unitarity. We demonstrate it in the case of the equal fiber radii. The resultant models are closely related to the CFTs with the discrete torsion. The unitarization is also physically interpreted as multiple insertions of the twist/interface operators along various directions.

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