Block orthogonal polynomials: I. Definitions and properties

DOI10.1088/1751-8113/40/10/009zbMATH Open1112.33011arXivmath-ph/0606036OpenAlexW3105541067MaRDI QIDQ3427269

J.-M. Normand

Publication date: 16 March 2007

Published in: Journal of Physics A: Mathematical and Theoretical (Search for Journal in Brave)

Abstract: Constrained orthogonal polynomials have been recently introduced in the study of the Hohenberg-Kohn functional to provide basis functions satisfying particle number conservation for an expansion of the particle density. More generally, we define block orthogonal (BO) polynomials which are orthogonal, with respect to a first Euclidean scalar product, to a given $i$-dimensional subspace ${calE}_i$ of polynomials associated with the constraints. In addition, they are mutually orthogonal with respect to a second Euclidean scalar product. We recast the determination of these polynomials into a general problem of finding particular orthogonal bases in an Euclidean vector space endowed with distinct scalar products. An explicit two step Gram-Schmidt orthogonalization (G-SO) procedure to determine these bases is given. By definition, the standard block orthogonal (SBO) polynomials are associated with a choice of ${calE}_i$ equal to the subspace of polynomials of degree less than $i$. We investigate their properties, emphasizing similarities to and differences from the standard orthogonal polynomials. Applications to classical orthogonal polynomials will be given in forthcoming papers.

Full work available at URL: https://arxiv.org/abs/math-ph/0606036

zbMATH Keywords

orthogonal polynomialsorthogonalizationconstraintsEuclidean inner product

Mathematics Subject Classification ID

Orthogonal functions and polynomials, general theory of nontrigonometric harmonic analysis (42C05) Many-body theory; quantum Hall effect (81V70) Basic orthogonal polynomials and functions (Askey-Wilson polynomials, etc.) (33D45) Applications of hypergeometric functions (33C90) Other special orthogonal polynomials and functions (33C47)

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Block orthogonal polynomials: II. Hermite and Laguerre standard block orthogonal polynomials

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