Ideals in enveloping algebras of affine Kac-Moody algebras

Rekha Biswal, Susan J. Sierra

Let $L$ be an affine Kac-Moody algebra, with central element $c$, and let $\lambda \in \mathbb{C}$. We study two-sided ideals in the central quotient $U_{\lambda }(L):=U(L)/(c-\lambda )$ of the universal…