Aubert dual conjecture for representations parametrized by extended multi-segments

Let E=ρ{([Ai,Bi]ρ,li,ηi)}i(Iρ,>)\mathcal{E} = \cup_{\rho}\{ ([A_i,B_i]_{\rho}, l_i, \eta_i) \}_{i \in (I_\rho,>)} be an extended multi-segment, and let

E^=ρ{([Ai,Bi]ρ,l^i,η^i)}i(Iρ,>^)\hat{\mathcal{E}} = \cup_{\rho}\{ ([A_i,-B_i]_{\rho}, \hat{l}_i, \hat{\eta}_i) \}_{i \in (I_\rho,\hat{>})}

be the extended multi-segment defined from E\mathcal{E}. Write π(E)\pi(\mathcal{E}) for the representation associated with E\mathcal{E} and π^(E)\hat{\pi}(\mathcal{E}) for its Aubert dual. Aubert dual conjecture. If π(E)0\pi(\mathcal{E}) \not= 0, then

π^(E)π(E^).\hat{\pi}(\mathcal{E}) \cong \pi(\hat{\mathcal{E}}).

The conjecture proposes an explicit description of the Aubert involution on the representations constructed from extended multi-segments. Aubert duality is known to exchange the packets attached to an AA-parameter and its parameter obtained by exchanging the two SL2(C)\mathrm{SL}_2(\mathbb{C}) factors, but the claimed formula at the level of extended multi-segments is presented here as a conjecture.

Sources & referencesView supporting material

Primary source

Hiraku Atobe, “Construction of local A-packets”, arXiv:2012.07232 (2022).

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