Asymptotic signature formula for irreducible modules of arbitrary support

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Let WW be a finite real reflection group, let c∈pRc\in\mathfrak{p}_{\mathbb{R}}, and let λ∈Irr⁡(W)\lambda\in\operatorname{Irr}(W). Let Lc(λ)L_c(\lambda) be the corresponding irreducible rational Cherednik algebra module, and choose a generic point b∈Supp⁡(Lc(λ))∩hR=Supp⁡Kc,λb\in\operatorname{Supp}(L_c(\lambda))\cap\mathfrak{h}_{\mathbb{R}}=\operatorname{Supp}K_{c,\lambda}. Set W′=Stab⁡W(b)W'=\operatorname{Stab}_W(b) and use the local decomposition and Hermitian forms hμh_\mu from the local structure conjecture. Asymptotic signature conjecture. The asymptotic signature ac,λa_{c,\lambda} is

ac,λ=∑μ∈Irr⁡(W′)dim⁡Lc(μ)<∞dim⁡Lc(μ) ac,μ sign⁡(hμ)dim⁡Res⁡bLc(λ).a_{c,\lambda}=\frac{\displaystyle\sum_{\substack{\mu\in\operatorname{Irr}(W')\\ \dim L_c(\mu)<\infty}}\dim L_c(\mu)\,a_{c,\mu}\,\operatorname{sign}(h_\mu)}{\dim\operatorname{Res}_b L_c(\lambda)}.

For full-support modules this specializes to the established signature theorem, while the arbitrary-support formula depends on the preceding local description and is presented as a conjectural extension.

References

Primary source

Seth Shelley-Abrahamson, “The Dunkl Weight Function for Rational Cherednik Algebras”, arXiv:1803.00440 (2018).

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