Mehler's formulas for the univariate complex Hermite polynomials and applications

Abstract

We give two widest Mehler's formulas for the univariate complex Hermite polynomials $H_{m,n}^{\nu }$, by performing double summations involving the products $u^m{H}_{m,n}^{\nu }(z,\overline{z})\overline{H_{m,n}^{\nu }(w,\overline{w})}$ and $u^m{v}^n{H}_{m,n}^{\nu }(z,\overline{z})\overline{H_{m,n}^{{\nu }^{\prime }}(w,\overline{w})}$. They can be seen as the complex analogues of the classical Mehler's formula for the real Hermite polynomials. The proof of the first one is based on a generating function giving rise to the reproducing kernel of the generalized Bargmann space of level $m$. The second Mehler's formula generalizes the one appearing as a particular case of the so-called Kibble-Slepian formula. The proofs, we present here are direct and more simpler. Moreover, direct applications are given and remarkable identities are derived.

5 pages. To appear in Math. Methods Appl. Sci

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