Morita equivalences for Zhu's algebra

Abstract

Through the introduction of new ideals, and with the assistance of the $d$-th mode transition algebras ${\mathfrak{A}}_d$, for $d\in \mathbb{N}$, we show how Zhu's associative algebra $\mathsf{A}$, conventionally valued for tracking information about the degree $0$ part of an $\mathbb{N}$-graded module over a vertex operator algebra $V$, also contains information about components of higher degree. As an application, equivalent conditions are given for rationality of $V$, and explicit presentations for higher-level Zhu algebras are given, including for a large class of non-rational VOAs.

We significantly reorganized the paper, adding various new results, including Theorem 2.0.4 and Theorem 4.0.10