The Weyl Algebra, Spherical Harmonics, and Hahn Polynomials

Details The Weyl Algebra, Spherical Harmonics, and Hahn Polynomials The Weyl Algebra, Spherical Harmonics, and Hahn Polynomials

2001-10-02

arxiv.org/abs/math-ph/0110006v1

Physics

Mathematical Physics

13 pages, uses bcp01e.sty

Scientific paper

In this article we apply the duality technique of R. Howe to study the structure of the Weyl algebra. We introduce a one-parameter family of ``ordering maps'', where by an ordering map we understand a vector space isomorphism of the polynomial algebra on $\NR^{2d}$ with the Weyl algebra generated by creation and annihilation operators $a_1, ..., a_d, a_1^+, ..., a_d^+$. Corresponding to these orderings, we construct a one-parameter family of ${\fr sl}_2$ actions on the Weyl algebra, what enables us to define and study certain subspaces of the Weyl algebra -- the space of Weyl spherical harmonics and the space of ``radial polynomials''. For the latter we generalize results of Luck and Biedenharn, Bender et al., and Koornwinder describing the radial elements in terms of continuous Hahn polynomials of the number operator.

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