The Huang Algebra Ideal and the Diagonal Shift Property

Abstract

Let $V$ be a grading-restricted vertex algebra and let $A^{\infty }(V)=U^{\infty }(V)/Q^{\infty }(V)$ be the associative algebra constructed by Huang, where $U^{\infty }(V)$ is the space of column-finite infinite matrices with entries in $V$ and $Q^{\infty }(V)$ is an ideal of a (nonassociative) algebra structure on $U^{\infty }(V)$ defined by Huang. Huang introduced families of elements in $Q^{\infty }(V)$ and conjectured that these elements generate $Q^{\infty }(V)$. We introduce the ``diagonal shift property" and prove that the elements that Huang conjectured as a generating set for $Q^{\infty }(V)$ satisfy this property. On the other hand, in the case that $V$ is the rank one Heisenberg vertex operator algebra, we construct infinitely many linearly independent elements in $Q^{\infty }(V)$ that do not satisfy the diagonal shift property. As a corollary, we disprove Huang's conjecture.

arXiv commentFinal version, to appear in the Journal of Pure and Applied Algebra