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New aspects of Bargmann transform using Touchard polynomials and hypergeometric functions

Part of: Linear function spaces and their duals Special classes of linear operators Spaces and algebras of analytic functions

Published online by Cambridge University Press:  09 January 2025

Daniel Alpay Open the ORCID record for Daniel Alpay [Opens in a new window] ,
Antonino De Martino  and
Kamal Diki Open the ORCID record for Kamal Diki [Opens in a new window]
Daniel Alpay
Affiliation:
Schmid College of Science and Technology, Chapman University, California 92866, USA e-mail: alpay@chapman.edu
Antonino De Martino*
Affiliation:
Politecnico di Milano, Dipartimento di Matematica, 20133 Milano, Italy
Kamal Diki
Affiliation:
Clifford research group, Department of Electronics and Information Systems, Faculty of Engineering and Architecture, Ghent University, 9000 Ghent, Belgium e-mail: Kamal.Diki@UGent.be
*
e-mail: antonino.demartino@polimi.it
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Abstract

In this paper, we study the ranges of the Schwartz space $\mathcal {S}$ and its dual $\mathcal {S}'$ (space of tempered distributions) under the Bargmann transform. The characterization of these two ranges leads to interesting reproducing kernel Hilbert spaces whose reproducing kernels can be expressed, respectively, in terms of the Touchard polynomials and the hypergeometric functions. We investigate the main properties of some associated operators and introduce two generalized Bargmann transforms in this framework. This can be considered as a continuation of an interesting research path that Neretin started earlier in his book on Gaussian integral operators.

Keywords

Bargmann transformTouchard polynomialshypergeometric functionsFock space

MSC classification

Primary: 30H20: Bergman spaces, Fock spaces 46E22: Hilbert spaces with reproducing kernels (=
Secondary: 47B38: Operators on function spaces (general)

Information

Type
Article
Information
Canadian Journal of Mathematics , Volume 78 , Issue 2 , April 2026 , pp. 405 - 450
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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Canadian Mathematical Society

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