The compact induction conjecture for irreducible supercuspidal representations

Let GG be a reductive group and let M(G)\mathcal{M}(G) denote the representations of GG. Let πM(G)\pi\in\mathcal{M}(G) be irreducible and supercuspidal. A subgroup KK of GG is compact modulo the centre if its image in the quotient of GG by the centre is compact. Let c-indKG(ρ)\mathrm{c\text{-}ind}_K^G(\rho) denote compact induction from KK to GG. Compact induction conjecture. There exist an open subgroup KK compact modulo the centre and an irreducible smooth representation ρ\rho of KK such that

π=c-indKG(ρ).\pi=\mathrm{c\text{-}ind}_K^G(\rho).

This conjecture asserts that all irreducible supercuspidal representations of reductive groups arise by the compact-induction construction described in the surrounding discussion. The source does not state a resolution, so the conjecture is recorded as open.

Sources & referencesView supporting material

Primary source

Arnaud Mayeux, “Représentations supercuspidales”, arXiv:1706.05920 (2017).

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