Centrally generated primitive ideals of $U(\mathfrak{n})$ in types $B$ and $D$

Abstract

We study the centrally generated primitive ideals of $U(\mathfrak{n})$, where $\mathfrak{n}$ is the (locally) nilpotent radical of a (splitting) Borel subalgebra of a simple complex Lie algebra $\mathfrak{g}={\mathfrak{o}}_{2n+1}(\mathbb{C})$, ${\mathfrak{o}}_{2n}(\mathbb{C})$, ${\mathfrak{o}}_{\infty }(\mathbb{C})$. In the infinite-dimensional setting, there are infinitely many isomorphism classes of Lie algebras $\mathfrak{n}$, and we fix $\mathfrak{n}$ with "largest possible" center of $U(\mathfrak{n})$. We characterize the centrally generated primitive ideals of $U(\mathfrak{n})$ in terms of the Dixmier map and the Kostant cascade.

22 pages. arXiv admin note: text overlap with arXiv:1502.05486