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arXiv 1106.4641cond-mat.mes-hallhep-th
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2+1维拓扑态物质的非阿贝尔BF理论

Non-Abelian BF theory for 2+1 dimensional topological states of matter

A. Blasi, A. Braggio, M. Carrega, D. Ferraro, N. Maggiore, N. Magnoli

摘要:

基于Symanzik可分性条件,对具有边界的2+1维BF模型在阿贝尔和非阿贝尔情形下进行了场论分析。在这两种情况下的边缘上,我们得到Kaplan-Moody代数与相反的手征反映时间反演不变性的理论。虽然阿贝尔的情况下,在中心荷的值呈现出明显的任意性,非阿贝尔理论的边界上的物理是完全由时间反演和规范对称性。对非阿贝尔BF模型的讨论表明,边界上的时间反演对称性意味着存在反向传播的手征流。

英文摘要:

We present a field theoretical analysis of the 2+1 dimensional BF model with boundary in the Abelian and the non-Abelian case based on the Symanzik's separability condition. In both cases on the edges we obtain Kač--Moody algebras with opposite chiralities reflecting the time reversal invariance of the theory. While the Abelian case presents an apparent arbitrariness in the value of the central charge, the physics on the boundary of the non-Abelian theory is completely determined by time reversal and gauge symmetry. The discussion of the non-Abelian BF model shows that time reversal symmetry on the boundary implies the existence of counter-propagating chiral currents.

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