The q-deformed random-to-random commutativity conjecture

Assume q0q\neq0. Let Hnaff\operatorname{\mathcal{H}}_n^{\operatorname{aff}} be the affine Hecke algebra containing Hn\operatorname{\mathcal{H}}_n and the Laurent polynomial ring in x1,,xnx_1,\ldots,x_n, and define

R~n,k:=1[k]!qBn,k(xnk+1xn1xn)Bn,kHnaff.\operatorname{\widetilde{\mathcal{R}}}_{n,k}:=\frac{1}{[k]!_q}\operatorname{\mathcal{B}}^*_{n,k}(x_{n-k+1}\cdots x_{n-1}x_n)\operatorname{\mathcal{B}}_{n,k}\in\operatorname{\mathcal{H}}_n^{\operatorname{aff}}.

Here n,k0n,k\geq0, [k]!q[k]!_q is the qq-factorial, and Bn,k\operatorname{\mathcal{B}}_{n,k} is the element used in this definition. The q-deformed commutativity conjecture. For every n0n\geq0, the elements R~n,k\operatorname{\widetilde{\mathcal{R}}}_{n,k} commute for all k0k\geq0. This is proposed as an analogue of the corresponding commutativity theorem for the undeformed elements; the affine-Hecke-algebra deformation is presented as conjectural, and no result resolving it is given.

Sources & referencesView supporting material

Primary source

Sarah Brauner, Patricia Commins, Darij Grinberg and Franco Saliola, “The q-deformed random-to-random family in the Hecke algebra”, arXiv:2503.17580 (2025).

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