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arXiv math-ph/0505040math-phhep-thmath.MP
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对称$D$ -膜与Verlinde环的融合

Fusion of symmetric $D$-branes and Verlinde rings

A. L. Carey, Bai-Ling Wang

摘要:

我们解释了如何乘法丛gerbe在一个紧凑的,连通的和简单的李群$G$导致一定的融合范畴的等变丛gerbe模所给出的预量化的哈密顿$LG$ -流形所产生的Alekseev-Malkin-Meinrenken的拟哈密顿$G$ -空间。其动机来自弦论,即通过推广$G$中的$D$ -膜的概念,以允许$G$的子集是$G$ -值矩映射的图像,我们可以定义一个“$D$ -膜的融合”和一个到$G$的循环群的Verlinde环的映射,该映射保留了乘积结构。这个想法是由Freed-Hopkins-Teleman定理提出的。利用乘法丛格贝的等变丛格贝模,研究了$G$不是单连通的情形.

英文摘要:

We explain how multiplicative bundle gerbes over a compact, connected and simple Lie group $G$ lead to a certain fusion category of equivariant bundle gerbe modules given by pre-quantizable Hamiltonian $LG$-manifolds arising from Alekseev-Malkin-Meinrenken's quasi-Hamiltonian $G$-spaces. The motivation comes from string theory namely, by generalising the notion of $D$-branes in $G$ to allow subsets of $G$ that are the image of a $G$-valued moment map we can define a `fusion of $D$-branes' and a map to the Verlinde ring of the loop group of $G$ which preserves the product structure. The idea is suggested by the theorem of Freed-Hopkins-Teleman. The case where $G$ is not simply connected is studied carefully in terms of equivariant bundle gerbe modules for multiplicative bundle gerbes.

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