The component formula for intertwining-operator poles

Let C,DCompC,D\in\mathbf{Comp}, and let π(C)\pi(C) and π(D)\pi(D) be the corresponding irreducible representations. For irreducible representations π,σ\pi,\sigma, let Λ(π,σ)\Lambda(\pi,\sigma) be the order of the pole at s=0s=0 of the meromorphically continued intertwining operator Mπ,σ(s)M_{\pi,\sigma}(s). Let d(π,σ)\mathfrak{d}(\pi,\sigma) be the sum of the two pole orders and the order of the zero at s=0s=0 of the corresponding composition. Write homΠ(D,C)\operatorname{hom}_\Pi(D,C) and extΠ1(D,C)\operatorname{ext}^1_\Pi(D,C) for the generic Hom and first Ext dimensions attached to the components.

Intertwining-pole conjecture. One has

Λ(π(C),π(D))=homΠ(D,C),d(π(C),π(D))=extΠ1(D,C).\Lambda(\pi(C),\pi(D))=\operatorname{hom}_\Pi(D,C),\qquad \mathfrak{d}(\pi(C),\pi(D))=\operatorname{ext}^1_\Pi(D,C).

This is the paper's main geometric conjecture: it predicts that pole orders of intertwining operators are controlled by Hom and Ext data of Lusztig's characteristic variety. The supplied text does not state a resolution.

Sources & referencesView supporting material

Primary source

Johannes Droschl, “Poles of intertwining operators in terms of irreducible components of Lusztig's characteristic variety in type A”, arXiv:2508.13817 (2025).

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.