The affine type A Kleshchev skew-Specht classification conjecture

From papers

Let e2e\geq2, let iZei\in\mathbb{Z}_e, and let Rθ(Ae1(1))R_\theta({\tt A}_{e-1}^{(1)}) be the KLR algebra for a root-lattice element θ\theta. Let MPK(i,i)(θ)\mathcal{MP}_{\mathrm K}^{(i,i)}(\theta) be the Kleshchev Ae1(1){\tt A}_{e-1}^{(1)}-bipartitions of bicharge (i,i)(i,i) with content θ\theta. Then affine type A Kleshchev skew-Specht classification conjecture. For every (λ(1),λ(2))MPK(i,i)(θ)(\lambda^{(1)},\lambda^{(2)})\in\mathcal{MP}_{\mathrm K}^{(i,i)}(\theta), the Specht module S(λ(1)\λ(2))\boldsymbol{\mathsf{S}}(\lambda^{(1)}\backslash\lambda^{(2)}) has simple head, and

{hdS(λ(1)\λ(2))(λ(1),λ(2))MPK(i,i)(θ)}\left\{\operatorname{hd}\boldsymbol{\mathsf{S}}(\lambda^{(1)}\backslash\lambda^{(2)})\mid(\lambda^{(1)},\lambda^{(2)})\in\mathcal{MP}_{\mathrm K}^{(i,i)}(\theta)\right\}

is a complete, though redundant, list of simple Rθ(Ae1(1))R_\theta({\tt A}_{e-1}^{(1)})-modules up to isomorphism and grading shift. This conjecture seeks a uniform skew-Specht classification in all affine type A ranks, motivated by small-rank computations.

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Primary source

Samantha Allen, Jack Isaac, Corinne Moscariello, Robert Muth, Bella Deborah Uwase and Lucas Walton, “Kleshchev multipartitions, affine Mirković-Vilonen polytopes, and representations of KLR algebras in type A^(1)_1”, arXiv:2606.00421 (2026).

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