Compact Chern character and weighted orbital integral conjecture

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Let GG be a pp-adic group, let Sm{\rm Sm} be the category of smooth modules and Adm⊂Sm{\rm Adm}\subset {\rm Sm} the subcategory of admissible modules. Let HH0c(Sm)HH_0^c({\rm Sm}) and HH0(Sm‾)HH_0(\overline{\rm Sm}) denote compactly supported and compactified Hochschild homology, let KGc\mathcal K_G^c be the subspace of weightless measures supported on compact elements, and let chˉ\bar{ch} be the Chern character map. Compact Chern character and weighted orbital integral conjecture. There is a canonical isomorphism

KGc≅Im(HH0c(Sm)→HH0(Sm‾)),\mathcal K_G^c\cong {\rm Im}\bigl(HH_0^c({\rm Sm})\to HH_0(\overline{\rm Sm})\bigr),

and, for ρ∈Adm\rho\in{\rm Adm} and compact regular semisimple g∈Gg\in G,

WOg(chˉ(ρ))=χρ(g).WO_g(\bar{ch}(\rho))=\chi_\rho(g).

This connects compactly supported Hochschild homology and Chern characters with character values; the supplied text does not state whether these assertions are known beyond the cases discussed in the paper.

References

Primary source

Roman Bezrukavnikov and David Kazhdan, “Character values and Hochschild homology”, arXiv:1803.09442 (2018).

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