Asymptotic signature formula for irreducible modules of arbitrary support

Let WW be a finite real reflection group, let cpRc\in\mathfrak{p}_{\mathbb{R}}, and let λIrr(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 bSupp(Lc(λ))hR=SuppKc,λb\in\operatorname{Supp}(L_c(\lambda))\cap\mathfrak{h}_{\mathbb{R}}=\operatorname{Supp}K_{c,\lambda}. Set W=StabW(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=μIrr(W)dimLc(μ)<dimLc(μ)ac,μsign(hμ)dimResbLc(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.

Sources & referencesView supporting material

Primary source

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

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