Modular invariants and twisted equivariant K-theory II: Dynkin diagram symmetries

Evans, David Emrys and Gannon, Terry 2013. Modular invariants and twisted equivariant K-theory II: Dynkin diagram symmetries. Journal of K-theory: K-theory and its Applications to Algebra, Geometry, and Topology 12 (2) , pp. 273-330. 10.1017/is013003008jkt221

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Abstract

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 Dbrane charges and charge-groups. We also study conformal embeddings and the $\double-struck(E)_7\$ 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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Mathematics
Subjects:	Q Science > QA Mathematics
Uncontrolled Keywords:	twisted equivariant K-theory; conformal field theory; modular invariant; subfactor
Additional Information:	Online publication date: 26 June 2013. Previous version available on arxiv: http://arxiv.org/abs/1012.1634
Publisher:	Cambridge University Press
ISSN:	1865-2433
Funders:	EPSRC
Last Modified:	04 Jun 2017 04:17
URI:	https://orca.cardiff.ac.uk/id/eprint/35953

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