A dual theory of twisted Zhu's theory

Abstract

The notion of admissible $g$-twisted $V$-comodules is investigated for a graded vertex operator coalgebra $V$ and a finite order automorphism $g\in \Aut V$. We prove that $\mathcal{M}$ is an admissible $g$-twisted $V$-comodule if and only if its graded dual ${\mathcal{M}}^{\prime }$ is an admissible $g^{-1}$-twisted $V^{\prime }$-module for vertex operator algebra $V^{\prime }$. Then we establish a dual theory of twisted Zhu's theory, i.e., there is a coassociative coalgebra $C_g(V)$ for a graded vertex operator coalgebra $V$, any admissible $g$-twisted $V$-comodule gives a $C_g(V)$-comodule, and vice versa. We also prove that $V$ is $g$-corational, which means every admissible $g$-twisted $V$-comodule is completely reducible, if and only if its dual vertex operator algebra $V^{\prime }$ is $g$-rational.