Canonical Commutation Relation Preserving Maps

Abstract

We study maps preserving the Heisenberg commutation relation $ab-ba=1$. We find a one-parameter deformation of the standard realization of the above algebra in terms of a coordinate and its dual derivative. It involves a non-local ``coordinate'' operator while the dual ``derivative'' is just the Jackson finite-difference operator. Substitution of this realization into any differential operator involving $x$ and $\frac{d}{dx}$, results in an {\em isospectral} deformation of a continuous differential operator into a finite-difference one. We extend our results to the deformed Heisenberg algebra $ab-qba=1$. As an example of potential applications, various deformations of the Hahn polynomials are briefly discussed.

11 pages. To appear in J. Phys. A., Special Issue on Difference Equations Revised version: an important note, communicated to us by C. Zachos, has been added, giving the similarity transformation between classical and q-deformed coordinates and derivatives

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