Bimodules and g-rationality of vertex operator algebras

Details Bimodules and g-rationality of vertex operator algebras Bimodules and g-rationality of vertex operator algebras

2006-07-28

arxiv.org/abs/math/0607758v1

Mathematics

Quantum Algebra

32 pages

Scientific paper

This paper studies the twisted representations of vertex operator algebras. Let V be a vertex operator algebra and g an automorphism of V of finite order T. For any m,n in (1/T)Z_+, an A_{g,n}(V)-A_{g,m}(V)-bimodule A_{g,n,m}(V) is constructed. The collection of these bimodules determines any admissible g-twisted V-module completely. A Verma type admissible g-twisted V-module is constructed naturally from any A_{g,m}(V)-module. Furthermore, it is shown with the help of bimodule theory that a simple vertex operator algebra V is g-rational if and only if its twisted associative algebra A_g(V) is semisimple and each irreducible admissible g-twisted V-module is ordinary.

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