Shao-Yin-Zhao's conjecture for associated varieties at non-admissible integer levels

Let \fg\fg be a simple simply-laced Lie algebra, let k\BQk\in\BQ satisfy k+\mathbbmhˇ=m1k+\check{\operatorname{\mathbbm{h}}}=m\geq1, and let Lk(\fg)L_k(\fg) be the simple affine vertex algebra. Let \fgˇ\check{\fg} be the Langlands dual Lie algebra, let \BOˇ(m)\check\BO(m) be the nilpotent orbit attached to mm, and write \BOˇ(m)=SatLˇGˇ\BOLˇ\check\BO(m)=\operatorname{Sat}_{\check L}^{\check G}\BO_{\check L} from a Bala–Carter Levi \flˇ\check\fl. Let \fl\fl be the corresponding Levi of \fg\fg, let \fp=\fl\fu\fp=\fl\oplus\fu be a parabolic subalgebra, let \fz(\fl)\fz(\fl) be the center of \fl\fl, and let \bd\bd and \bdL\bd_L denote the Barbasch–Vogan–Lusztig–Spaltenstein duality maps. Write \cN\cN for the nilpotent cone. Shao-Yin-Zhao's conjecture. One has

XLk(\fg)=AdG(\bdL\BOLˇ×\fz(\fl)×\fu).X_{L_k(\fg)}=\overline{\operatorname{Ad}G\cdot(\bd_L\BO_{\check L}\times\fz(\fl)\times\fu)}.

In particular,

XLk(\fg)\cN=\bd\BOˇ(m),X_{L_k(\fg)}\cap\cN=\overline{\bd\check\BO(m)},

and XLk(\fg)\cNX_{L_k(\fg)}\subseteq\cN if and only if \BOˇ(m)\check\BO(m) is distinguished. This is the integer-level predecessor of the paper's main rational-level conjecture; the source recalls it from earlier work and does not report a resolution.

Sources & referencesView supporting material

Primary source

Peng Shan, Wenbin Yan and Qixian Zhao, “Associated varieties of simple affine vertex algebras at rational levels”, arXiv:2606.08990 (2026).

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