Andersen's conjecture on modular and quantum tilting characters
Let be a semisimple, simply connected algebraic group with root system over an algebraically closed field of characteristic , let be the dominant weights in the interior of the fundamental -alcove, and let denote the relevant set of dominant elements for the -dilated dot action. For a dominant weight , write for the indecomposable modular tilting module and for the corresponding quantum tilting module.
Andersen's conjecture. Suppose Lusztig's conjecture holds for in characteristic . For and dominant , one has
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.
References
Primary source
Amit Hazi, “Matrix recursion for positive characteristic diagrammatic Soergel bimodules for affine Weyl groups”, arXiv:1708.07072 (2025).
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