Restricted modules and associated vertex algebras of extended Heisenberg-Virasoro algebra

Abstract

In this paper, a family of infinite dimensional Lie algebras $\tilde{\mathcal{L}}$ is introduced and investigated, called the extended Heisenberg-Virasoro algebra,denoted by $\tilde{\mathcal{L}}$. These Lie algebras are related to the $N=2$ superconformal algebra and the Bershadsky-Polyakov algebra. We study restricted modules and associated vertex algebras of the Lie algebra $\tilde{\mathcal{L}}$. More precisely, we construct its associated vertex (operator) algebras $V_{\tilde{\mathcal{L}}}(\ell_{123},0)$, and show that the category of vertex algebra $V_{\tilde{\mathcal{L}}}(\ell_{123},0)$-modules is equivalent to the category of restricted $\tilde{\mathcal{L}}$-modules of level $\ell_{123}$.Then we give uniform constructions of simple restricted $\tilde{\mathcal{L}}$-modules. Also, we present several equivalent characterizations of simple restricted modules over $\tilde{\mathcal{L}}$.