A depth-bounded local converse conjecture for supercuspidal representations of general linear groups

Let FF be the underlying non-Archimedean local field, let n n be a positive integer, and let π1 \pi_{1} and π2 \pi_{2} be irreducible supercuspidal representations of GL(n,F)\operatorname{GL}(n,F) with the same central character. For a representation ρ \rho, write d(ρ)d(\rho) for its depth, and let ψF \psi_F be the fixed nontrivial additive character of FF. Depth-bounded local converse conjecture. If

γ(s,π1×τ,ψF)=γ(s,π2×τ,ψF)\gamma(s,\pi_{1}\times\tau,\psi_F)=\gamma(s,\pi_{2}\times\tau,\psi_F)

for every irreducible supercuspidal representation τ \tau of GL(r,F)\operatorname{GL}(r,F) with 1rn21\leq r\leq\left\lfloor\frac n2\right\rfloor and d(τ)d(πi)d(\tau)\leq d(\pi_i), then π1π2 \pi_1\cong\pi_2. This proposes that, once the central character is fixed, twists of bounded depth up to the middle rank should determine a supercuspidal representation.

Sources & referencesView supporting material

Primary source

David C. Luo and Shaun Stevens, “On the Local Converse Theorem for Depth 1N Supercuspidal Representations of GL(2N, F)”, arXiv:2505.22357 (2025).

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