Commutation of the nonabelian Fourier transforms on elliptic unipotent representations
Commutation of the nonabelian Fourier transforms on elliptic unipotent representations
Let be the reductive -adic group and let denote its elliptic unipotent representation space. Let be the Fourier transform on the elliptic unipotent side, let and be restriction maps to the unipotent representations of parahoric quotients, and let be projection to the elliptic parahoric space. Write for the parahoric Fourier transform and for the transform associated with a maximal hyperspecial parahoric . Commutation conjecture. The two Fourier transforms commute on the elliptic space:
Moreover, if is the maximal hyperspecial parahoric of , then on the elliptic subspace one has
This expected compatibility would relate the nonabelian Fourier transform for elliptic unipotent representations of the -adic group to the Fourier transforms for finite reductive quotients of parahoric subgroups. The supplied text gives no resolution, so the conjecture remains open.
Sources & referencesView supporting material
Primary source
Dan Ciubotaru, “The nonabelian Fourier transform for elliptic unipotent representations of exceptional p-adic groups”, arXiv:2006.13540 (2020).
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