Affine Macdonald evaluation conjecture

From papers

Let Jμ,k,k(q,λ,ω)=χμ,k,k(q,λ,ω)/χ0,0,k(q,λ,ω)J_{\mu,k,\mathsf{k}}(q,\lambda,\omega)=\chi_{\mu,k,\mathsf{k}}(q,\lambda,\omega)/\chi_{0,0,\mathsf{k}}(q,\lambda,\omega) be the affine Macdonald polynomial for Uq(sl^n)U_q(\widehat{\mathfrak{sl}}_n), with ρ\rho the finite Weyl vector, ρ~\widetilde{\rho} the affine Weyl vector, and mult(α)\operatorname{mult}(\alpha) the multiplicity of a positive affine root. Affine Macdonald evaluation conjecture. For q>1|q|>1, one has

Jμ,k,k(q,kρ,kn)=q2(μ,kρ)i=1k1(q2i;q2(k+kn))i=1k1(q2ni;q2(k+kn))i=1k1(q2ni;q2kn)i=1k1(q2i;q2kn)α>0i=0k1(1q2(α,μ+kΛ0+kρ~)2i)mult(α)(1q2(α,kρ~)2i)mult(α).J_{\mu,k,\mathsf{k}}(q,\mathsf{k}\rho,\mathsf{k}n)=q^{2(\mu,\mathsf{k}\rho)}\frac{\prod_{i=1}^{\mathsf{k}-1}(q^{-2i};q^{-2(k+\mathsf{k}n)})}{\prod_{i=1}^{\mathsf{k}-1}(q^{-2ni};q^{-2(k+\mathsf{k}n)})}\frac{\prod_{i=1}^{\mathsf{k}-1}(q^{-2ni};q^{-2\mathsf{k}n})}{\prod_{i=1}^{\mathsf{k}-1}(q^{-2i};q^{-2\mathsf{k}n})}\prod_{\alpha>0}\prod_{i=0}^{\mathsf{k}-1}\frac{(1-q^{-2(\alpha,\mu+k\Lambda_0+\mathsf{k}\widetilde{\rho})-2i})^{\operatorname{mult}(\alpha)}}{(1-q^{-2(\alpha,\mathsf{k}\widetilde{\rho})-2i})^{\operatorname{mult}(\alpha)}}.

The formula modifies the earlier evaluation conjecture so that it converges in the region required by the trace. Its general validity remains open.

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Sources & referencesView supporting material

Primary source

Eric M. Rains, Yi Sun and Alexander Varchenko, “Affine Macdonald conjectures and special values of Felder-Varchenko functions”, arXiv:1610.01917 (2017).

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