On the operator content of nilpotent orbifold models

Details On the operator content of nilpotent orbifold models On the operator content of nilpotent orbifold models

1994-12-12

arxiv.org/abs/hep-th/9412109v1

Physics

High Energy Physics

High Energy Physics - Theory

26 pages, Latex

Scientific paper

Let $V$ be a simple vertex operator algebra and $G$ be a finite nilpotent group of automorphisms of $V.$ We prove the following in this paper: (1) There is a Galois correspondence between subgroups of $G$ and the vertex operator subalgebras of $V$ which contain $V^G$ given by the map $H\mapsto V^H.$ (2) Assume that for every G\in G$ there is unique simple $g$-twisted $V$-module $M(g).$ Then there exists a Hochschild 3-cocycle $\alpha$ on the integral group $Z[G]$ such that there is an equivalence of categories between $V^G$-module category (whose objects are $V^G$-submodules of direct sums of copies of $\oplus_{g\in G}M(g),$ and whose morphisms are $V^G$-module homomorphisms) and the module category for the twisted quantum double $D_{\alpha}(G)$ associated to $\alpha.$

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