Alperin's Weight Conjecture for connected \ell-local compact groups

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Let F\mathcal F be an ℓ\ell-local compact group on a discrete ℓ\ell-toral group SS with maximal discrete torus TT. Write W=Out⁡F(T)W=\operatorname{Out}_{\mathcal F}(T) for its Weyl group, and let w(F)\mathbf w(\mathcal F) denote the number of weights of F\mathcal F up to conjugacy, where weights are defect-zero characters of F\mathcal F-centric radical subgroups.

Alperin's Weight Conjecture. If F\mathcal F is connected, meaning every element of SS is F\mathcal F-conjugate to an element of TT, then

w(F)=∣Irr⁡(W)∣.\mathbf w(\mathcal F)=|\operatorname{Irr}(W)|.

This extends Alperin's Weight Conjecture to connected ℓ\ell-local compact groups. The conjecture holds when the ℓ\ell-adic valuation of ∣W∣|W| is zero, and the paper proves it when F\mathcal F is simple and vℓ(∣W∣)=1v_\ell(|W|)=1; it remains open in general.

References

Primary source

Jason Semeraro, “Weights for -local compact groups”, arXiv:2208.12762 (2023).

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