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

Let F\mathcal F be an \ell-local compact group on a discrete \ell-toral group SS with maximal discrete torus TT. Write W=OutF(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 \ell-local compact groups. The conjecture holds when the \ell-adic valuation of W|W| is zero, and the paper proves it when F\mathcal F is simple and v(W)=1v_\ell(|W|)=1; it remains open in general.

Sources & referencesView supporting material

Primary source

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

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