The RoCK core block conjecture for the map eta

Let Λ\Lambda be a dominant weight, let κ\boldsymbol{\kappa} be the associated charge, let ω\omega and β\beta be weights, and let Λ+κ(ω)\Lambda_+^{\boldsymbol{\kappa}}(\omega) denote the corresponding block. Write ee for the quantum characteristic, θ\theta for the relevant parameter, ht(β)\operatorname{ht}(\beta) for the height of β\beta, and capδθ(ω,κ)\operatorname{cap}_\delta^\theta(\omega,\boldsymbol{\kappa}) for the associated capacity. Let ηω,βΛ\eta_{\omega,\beta}^\Lambda be the map from the tensor product of the relevant KLR algebras to the block algebra.

RoCK core block conjecture. If Λ+κ(ω)\Lambda_+^{\boldsymbol{\kappa}}(\omega) is a θ\theta-RoCK core block with ht(β)ecapδθ(ω,κ)\operatorname{ht}(\beta) \leq e \cdot \operatorname{cap}_\delta^\theta(\omega,\boldsymbol{\kappa}), then the map ηω,βΛ\eta_{\omega,\beta}^\Lambda is an isomorphism.

The claim concerns the tensor-product structure of KLR algebras associated with RoCK core blocks. The supplied text does not state whether this conjectural formulation is resolved beyond the cited surrounding results.

Sources & referencesView supporting material

Primary source

Robert Muth, Thomas Nicewicz, Liron Speyer and Louise Sutton, “A skew Specht perspective of RoCK blocks and cuspidal systems for KLR algebras in affine type A”, arXiv:2405.15759 (2025).

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