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arXiv 1012.1634math.KThep-th
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模不变量与扭曲等变K理论II:Dynkin图对称性

Modular Invariants and Twisted Equivariant K-theory II: Dynkin diagram symmetries

David E. Evans, Terry Gannon

摘要:

手征共形域论(CFT)最基本的结构是Verlinde环。Freed-Hopkins-Teleman将CFT的Verlinde环表示为扭曲等变K理论。我们建立在他们的工作,以表达K-理论上的结构,充分的CFT。特别是,模块不变的分拆函数(基本上parametrise可能的完整的CFTs)有丰富的解释冯诺依曼代数(子因子),这导致了发展的结构完整的CFT,如完整的系统(融合环的缺陷线),nimrep(圆柱分拆函数),α-归纳等模块分类解释这些已经遵循。对于一般的家庭的模块化不变量(即Dynkin图对称性相关),我们提供了一个K理论框架,这些其他CFT结构,并显示它们如何与D-膜电荷和电荷群。我们还研究了SU(2)的共形嵌入和E7模不变量,以及有限群的一些对偶族。这个新的K理论框架使我们能够简化和扩展以前在CFT中获得的这些结构的不太透明,更特别的描述。

英文摘要:

The most basic structure of chiral conformal field theory (CFT) is the Verlinde ring. Freed-Hopkins-Teleman have expressed the Verlinde ring for the CFT's associated to loop groups, as twisted equivariant K-theory. We build on their work to express K-theoretically the structures of full CFT. In particular, the modular invariant partition functions (which essentially parametrise the possible full CFTs) have a rich interpretation within von Neumann algebras (subfactors), which has led to the developments of structures of full CFT such as the full system (fusion ring of defect lines), nimrep (cylindrical partition function), alpha-induction etc. Modular categorical interpretations for these have followed. For the generic families of modular invariants (i.e. those associated to Dynkin diagram symmetries), we provide a K-theoretic framework for these other CFT structures, and show how they relate to D-brane charges and charge-groups. We also study conformal embeddings and the E7 modular invariant of SU(2), as well as some families of finite group doubles. This new K-theoretic framework allows us to simplify and extend the less transparent, more ad hoc descriptions of these structures obtained previously within CFT.

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