On the annihilator variety of a highest weight Harish-Chandra module

TL;DR

This paper describes the annihilator variety of highest weight Harish-Chandra modules for Hermitian Lie groups using combinatorial algorithms and shows that the Gelfand-Kirillov dimension depends only on a specific parameter when the module is unitarizable.

Contribution

It provides a combinatorial description of the annihilator variety and establishes a parameter dependence of the Gelfand-Kirillov dimension for unitarizable modules.

Findings

Description of annihilator variety via combinatorial algorithm

Gelfand-Kirillov dimension depends only on a specific parameter for unitarizable modules

Provides new insights into the structure of highest weight Harish-Chandra modules

Abstract

Let $G$ be a Hermitian type Lie group with maximal compact subgroup $K$. Let $L(\lambda)$ be a highest weight Harish-Chandra module of $G$ with the infinitesimal character $\lambda$. By using some combinatorial algorithm, we obtain a description of the annihilator variety of $L(\lambda)$. As an application, when $L(\lambda)$ is unitarizable, we prove that the Gelfand-Kirillov dimension of $L(\lambda)$ only depends on the value of $z=(\lambda,\beta^{\vee})$, where $\beta$ is the highest root.