Andersen's conjecture on modular and quantum tilting characters

Let GG be a semisimple, simply connected algebraic group with root system Φf\Phi_{\rm f} over an algebraically closed field of characteristic pp, let A0A_0 be the dominant weights in the interior of the fundamental pp-alcove, and let \prescriptpW\prescript{p}{}{W} denote the relevant set of dominant elements for the pp-dilated dot action. For a dominant weight λ\lambda, write T(λ)T(\lambda) for the indecomposable modular tilting module and Tp(λ)T_p(\lambda) for the corresponding quantum tilting module.

Andersen's conjecture. Suppose Lusztig's conjecture holds for GG in characteristic pp. For λA0\lambda \in A_0 and dominant x\prescriptpWx \in \prescript{p}{}{W}, one has

chT(xpλ)=chTp(xpλ).\operatorname{ch} T(x \cdot_p \lambda)=\operatorname{ch} T_p(x \cdot_p \lambda).

This conjecture predicts equality between modular and quantum tilting characters in the region governed by Lusztig's conjecture, strengthening Andersen's general lower-bound observation. The supplied text does not state whether it has been resolved.

Sources & referencesView supporting material

Primary source

Amit Hazi, “Matrix recursion for positive characteristic diagrammatic Soergel bimodules for affine Weyl groups”, arXiv:1708.07072 (2025).

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