Wavefront set conjecture for theta representations

Let FF be pp-adic with pmidnp mid n. Let G~\tilde{G} be a persistent nn-fold covering group. Let uXR u\in X\otimes \mathbf{R} be exceptional and let u~XR\tilde{ u}\in X\otimes \mathbf{R} be a saturation of u u. Let Θ(π,ν)\Theta(\pi^\dag,\nu) be the \theta representation and let Ntrmax(Θ(π,ν))\mathcal{N}_{\rm tr}^{\rm max}(\Theta(\pi^\dag,\nu)) denote its maximal trace-norm nilpotent orbits; let OSpr\mathcal{O}_{\rm Spr} be the nilpotent orbit attached by the Springer correspondence, jWν~Wj_{W_{\tilde{\nu}}}^W the Macdonald jj-induction, εν~\varepsilon_{\tilde{\nu}} the sign character, and σX\sigma^{\mathscr{X}} the twisted Weyl permutation representation. Wavefront set conjecture. In the Harish-Chandra local character expansion of Θ(π,ν)\Theta(\pi^\dag,\nu), one has

Ntrmax(Θ(π,ν))F={OSpr(jWν~W(εν~))}\mathcal{N}_{\rm tr}^{\rm \max}(\Theta(\pi^\dag,\nu))\otimes \overline{F}=\left\{\mathcal{O}_{\rm Spr}(j_{W_{\tilde{\nu}}}^W(\varepsilon_{\tilde{\nu}}))\right\}

and, for every orbit ONtrmax(Θ(π,ν))\mathcal{O}\in\mathcal{N}_{\rm tr}^{\rm \max}(\Theta(\pi^\dag,\nu)),

cO=jWν~W(εν~),εWσXW.c_{\mathcal{O}}=\left\langle j_{W_{\tilde{\nu}}}^W(\varepsilon_{\tilde{\nu}}),\varepsilon_W\otimes\sigma^{\mathscr{X}}\right\rangle_W.

This predicts the maximal nilpotent orbit and its coefficient in the local character expansion of theta representations; the supplied text gives no resolution status.

Sources & referencesView supporting material

Primary source

Fan Gao and Wan-Yu Tsai, “On the wavefront sets associated with theta representations”, arXiv:2008.03630 (2020).

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