Induced modules for orbifold vertex operator algebras

抄録

Let V be a simple vertex operator algebra and G<Aut V a finite abelian subgroup such that V^G is rational. We study the representations of V based on certain assumptions on V^G-modules. We prove a decomposition theorem for irre-ducible V-modules. We also define an induced module from V^G to V and show that every irreducible V-module is a quotient module of some induced module. In addition, we prove that V is rational in this case.