Canonical splitting and unramifiedness compatibility conjecture
Let be the set of relevant subgroups, let be the image defined in the preceding diagrams, and let \phi_\overline{\overline{\overline{\overline{\chi}}}} be the parameter of an unramified genuine character. Let \mathcal{S}(\phi_\overline{\overline{\overline{\overline{\chi}}}}) be its component group. Unramified packet compatibility conjecture. There is a canonical splitting of over , together with a bijection
\mathcal{L}(\phi_\overline{\overline{\overline{\overline{\chi}}}})\longleftrightarrow\operatorname{Irr}(\mathcal{S}(\phi_\overline{\overline{\overline{\overline{\chi}}}})),written \pi(\phi_\overline{\overline{\overline{\overline{\chi}}}},\rho)\leftrightarrow\rho. For every , splitting agreeing with on , , and such that is associated with , one has that \pi(\phi_\overline{\overline{\overline{\overline{\chi}}}},\rho) is -unramified if and only if \pi(\phi_\overline{\overline{\overline{\overline{\chi}}}},\gamma_{z,y}\cdot\rho) is -unramified, where
This would describe how unramifiedness transforms under the dual torus and character actions.
References
Primary source
Fan Gao, Freydoon Shahidi and Dani Szpruch, “Restrictions, L-parameters, and local coefficients for genuine representations”, arXiv:2102.08859 (2021).
Progress summary
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