Quantum alpha-determinants and q-deformed hypergeometric polynomials

Abstract

The quantum $\alpha$-determinant is defined as a parametric deformation of the quantum determinant. We investigate the cyclic ${\mathcal{U}}_q({\mathfrak{sl}}_2)$-submodules of the quantum matrix algebra ${\mathcal{A}}_q({\mathrm{Mat}}_2)$ generated by the powers of the quantum $\alpha$-determinant. For such a cyclic module, there exists a collection of polynomials which describe the irreducible decomposition of it in the following manner: (i) each polynomial corresponds to a certain irreducible ${\mathcal{U}}_q({\mathfrak{sl}}_2)$-module, (ii) the cyclic module contains an irreducible submodule if the parameter is a root of the corresponding polynomial. These polynomials are given as a $q$-deformation of the hypergeometric polynomials. This is a quantum analogue of the result obtained in our previous work [K. Kimoto, S. Matsumoto and M. Wakayama, Alpha-determinant cyclic modules and Jacobi polynomials, to appear in Trans. Amer. Math. Soc.].

10 pages