Ordinary Weight Conjecture for ell-compact groups

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Let XX be a simply connected ℓ\ell-compact group with Weyl group (W,L)(W,L), with ℓ>2\ell>2 very good, and let τ\tau be an automorphism of XX of finite order prime to ℓ\ell. Let Wϕ=ΦX(τ)W\phi=\Phi_X(\tau), let qq be a power of a prime different from ℓ\ell, and let F=F(τ ⁣X(q))\mathcal F=\mathcal F({{}^{\tau}\!}X(q)) be the associated fusion system on SS. For each s∈Ss\in S, let (W(s),L)(W(s),L) be the Zℓ{\mathbb Z}_\ell-reflection group underlying CX(s)C_X(s); let ζ∈Zℓ×\zeta\in{\mathbb Z}_\ell^\times satisfy q≡ζ(modℓ)q\equiv\zeta\pmod\ell; and let vs=νℓ(O⁡q(W(s)ϕs))−νℓ(∣W(s)ϕsζ∣)v_s=\nu_\ell(\operatorname{O}_q(W(s)\phi_s))-\nu_\ell(|W(s)_{\phi_s\zeta}|). Ordinary Weight Conjecture for ell-compact groups. For every d≥0d\ge0, one has

m(F,d)=∑s∈S/F∣Irr⁡d−vs(W(s)ϕsζ)∣.\mathbf m(\mathcal F,d)=\sum_{s\in S/\mathcal F}|{\operatorname{Irr}}^{d-v_s}(W(s)_{\phi_s\zeta})|.

This is a local reformulation and generalisation of the ordinary weight conjecture for spetses and finite groups of Lie type; the paper presents it as conjectural.

References

Primary source

Radha Kessar, Gunter Malle and Jason Semeraro, “Weight conjectures for -compact groups and spetses”, arXiv:2008.07213 (2023).

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