Twisted ϕ-coordinated modules for nonlocal vertex algebras

Abstract

Abstract In this paper, we study what we call twisted ϕ-coordinated modules for nonlocal vertex algebras including weak quantum vertex algebras and we give a conceptual construction of nonlocal vertex algebras and their twisted ϕ-coordinated modules. As an illustrating example, we study certain vertex algebras and their twisted ϕ-coordinated modules, associated to certain infinite dimensional Heisenberg Lie algebras. As a reformulation and a slight extension of a result of Lepowsky, and a result of Doyon, Lepowsky and Milas, we also give a canonical connection between twisted modules for a general 1 T Z -graded nonlocal vertex algebra V and twisted ϕ-coordinated modules for the nonlocal vertex algebra obtained from V by Zhu s change-of-variable theorem.