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Rhombic staircase tableaux and Koornwinder polynomials (2312.17469v4)
Published 29 Dec 2023 in math.CO, math-ph, math.MP, and math.PR
Abstract: In this article we give a combinatorial formula for a certain class of Koornwinder polynomials, also known as Macdonald polynomials of type $\tilde{C}$. In particular, we give a combinatorial formula for the Koornwinder polynomials $K_{\lambda} = K_{\lambda}(z_1,\dots,z_N; a,b,c,d; q,t)$, where $\lambda = (1,\dots,1,0,\dots,0)$. We also give combinatorial formulas for all ``open boundary ASEP polynomials'' $F_{\mu}$, where $\mu$ is a composition in ${-1,0,1}N$; these polynomials are related to the nonsymmetric Koornwinder polynomials $E_{\mu}$ up to a triangular change of basis. Our formulas are in terms of rhombic staircase tableaux, certain tableaux that we introduced in previous work to give a formula for the stationary distribution of the two-species asymmetric simple exclusion process (ASEP) on a line with open boundaries.
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