Theta-packet induction irreducibility conjecture

Let ψ\psi be a local AA-parameter with non-bounded Weil-group image that is a localization of a global elliptic AA-parameter. Write

ψ=(ψτ1s1++ψτrsr)+ψ0+((ψτ1s1++ψτrsr)c),\psi=(\psi_{\tau_1}|\cdot|^{s_1}+\cdots+\psi_{\tau_r}|\cdot|^{s_r})+\psi_0+\left((\psi_{\tau_1}|\cdot|^{s_1}+\cdots+\psi_{\tau_r}|\cdot|^{s_r})^c\right)^\vee,

with s1sr>0s_1\geq\cdots\geq s_r>0, and let ψ0\psi_0 be a local AA-parameter for G0G_0. For π0Πψ0θ(G0)\pi_0\in\Pi_{\psi_0}^\theta(G_0), define

I(π0)=IndPG(τ1dets1τrdetsrπ0).I(\pi_0)=\operatorname{Ind}_P^G\left(\tau_1|\det|^{s_1}\boxtimes\cdots\boxtimes\tau_r|\det|^{s_r}\boxtimes\pi_0\right).

Theta-packet induction conjecture. The representation I(π0)I(\pi_0) is irreducible for every π0Πψ0θ(G0)\pi_0\in\Pi_{\psi_0}^\theta(G_0). Moreover, if I(π0)I(π0)I(\pi_0)\simeq I(\pi'_0) for π0,π0Πψ0θ(G0)\pi_0,\pi'_0\in\Pi_{\psi_0}^\theta(G_0), then π0π0\pi_0\simeq\pi'_0. This conjecture predicts irreducibility and injectivity of the indicated parabolic induction, extending the packet construction beyond bounded local parameters; no resolution is given in the source.

Sources & referencesView supporting material

Primary source

Rui Chen and Jialiang Zou, “Theta Correspondence and Arthur packets”, arXiv:2104.12354 (2021).

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