Etingof's finite-dimensional representation-count conjecture

Let Hc,k(Γn)H_{c,k}(\Gamma_n) be the symplectic reflection algebra, and let a\mathfrak a and P+aP_+^{\mathfrak a} be as above. For each μP+a\mu\in P_+^{\mathfrak a}, let Lμ[ω0nδ]L_\mu[\omega_0-n\delta] denote the indicated weight space of the corresponding irreducible integrable a\mathfrak a-module.

Etingof's representation-count conjecture. The number of isomorphism classes of finite-dimensional irreducible representations of Hc,k(Γn)H_{c,k}(\Gamma_n) is

μP+a:μ2=0dimLμ[ω0nδ].\sum_{\mu\in P_+^{\mathfrak a}:\,\mu^2=0}\dim L_\mu[\omega_0-n\delta].

This is the i=0i=0 consequence of the main filtration conjecture and gives a representation-theoretic prediction for the finite-dimensional simples. It is verified in the examples discussed in the paper but is open in general.

Sources & referencesView supporting material

Primary source

Pavel Etingof, “Symplectic reflection algebras and affine Lie algebras”, arXiv:1011.4584 (2012).

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