Supercuspidal wavefront-set conjecture

Let π(λ,s,Oλ,s,L)\pi(\lambda,s,{{\mathcal O}}^\vee_{\lambda,s},{{\mathcal L}}^\vee) be an irreducible supercuspidal Gω(k){\mathbf G}^\omega({\mathsf k})-representation in the LL-packet Π(φ)=Π(λ,s,Oλ,s)\Pi(\varphi)=\Pi(\lambda,s,{{\mathcal O}}^\vee_{\lambda,s}), and set

Oφ=GOλ,s.{\mathbb O}^\vee_{\varphi}=G^\vee\cdot{{\mathcal O}}^\vee_{\lambda,s}.

Supercuspidal wavefront-set conjecture. One has

kˉWF(π)d(Oφ),{}^{\bar {\mathsf k}}\mathsf{WF}(\pi)\leq d^\vee({\mathbb O}^\vee_{\varphi}),

or equivalently Oφd(kˉWF(π)){\mathbb O}^\vee_{\varphi}\leq d({}^{\bar {\mathsf k}}\mathsf{WF}(\pi)). If Gω(k){\mathbf G}^\omega({\mathsf k}) is split and π\pi is depth-zero compactly induced from a cuspidal representation of the maximal hyperspecial parahoric subgroup, then

kˉWF(π)={d(Oφ)}.{}^{\bar {\mathsf k}}\mathsf{WF}(\pi)=\{d^\vee({\mathbb O}^\vee_{\varphi})\}.

The first assertion is a particular case of the paper's main conjecture. The equality is verified for depth-zero supercuspidal representations of symplectic, special orthogonal, and unitary groups, while the general statement remains open.

Sources & referencesView supporting material

Primary source

Dan Ciubotaru and Ju-Lee Kim, “The wavefront set: bounds for the Langlands parameter”, arXiv:2403.14261 (2025).

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