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Chapman & Hall/CRC eBooks

Quantum wavelets

Sabrine Arfaoui, Anouar Ben Mabrouk, Carlo Cattani

Published Apr 12, 2021• 0 citations
Publisher

Abstract

Quantum wavelets are special types of wavelet functions characterized by special properties that may not be satisfied by other functions. This chapter aims to develop wavelet functions based on some special functions such as Bessel one. Bessel functions form an important class of special functions and are applied almost everywhere in mathematical physics. There are three main ways to introduce Bessel functions. The first one is due to a special type of second-order singular and linear differential equations where the Bessel functions form a generator set of solutions. The second one resembles orthogonal polynomials and provides Bessel functions as solutions of three-level recurrent singular and linear functional equation. The third one provides Bessel functions via the Rodriguez derivation formula.

DOI
10.1201/9781003096924-5

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Quantum wavelets are special types of wavelet functions characterized by special properties that may not be satisfied by other functions. This chapter aims to develop wavelet functions based on some special functions such as Bessel one. Bessel functions form an important class of special functions and are applied almost everywhere in mathematical physics. There are three main ways to introduce Bessel functions. The first one is due to a special type of second-order singular and linear differential equations where the Bessel functions form a generator set of solutions. The second one resembles orthogonal polynomials and provides Bessel functions as solutions of three-level recurrent singular and linear functional equation. The third one provides Bessel functions via the Rodriguez derivation formula.
Over the last decade, Handy and Bessis have developed a moment-problem-based, multiscale quantization theory, the eigenvalue moment method (EMM), which has proven effective in solving singular, strongly coupled, multidimensional Schr\"odinger Hamiltonians. We extend the scope of EMM by demonstrating its essential role in the generation of wavelet transforms for one-dimensional quantum systems. Combining this with the function-wavelet reconstruction formulas currently available, we are able to recover the wave function systematically, from first principles, through a multiscale process proceeding from large spatial scales to smaller ones. This accomplishment also addresses another outstanding problem, that of reconstructing a function from its moments. For the class of problems considered, the combined EMM-wavelet analysis yields a definitive solution. \textcopyright{} 1996 The American Physical Society.
Nearly all of quantum physics is concerned with the properties of waves. The mathematical description of waves is covered in this second chapter, which makes use of the material covered in Chapter 1 to explain the wave equation, superposition and beats. The complex representation of waves is particularly important. The notion of a wave function, which is a solution of the wave equation, forms the basis of all quantum mechanics. Superposition and beat frequency will later be shown to account for the way in which light is emitted from atoms.
Bessel functions form an important class of special functions and are applied almost everywhere in mathematical physics. They are also called cylindrical functions, or cylindrical harmonics. This chapter is devoted to the construction of the generalized coherent state (GCS) and the theory of Bessel wavelets. The GCS is built by replacing the coefficient zn/n!,z∈C of the canonical CS by the cylindrical Bessel functions. Then, the Paley-Wiener space PW1 is discussed in the framework of a set of GCS related to the cylindrical Bessel functions and to the Legendre oscillator. We prove that the kernel of the finite Fourier transform (FFT) of L2-functions supported on −11 form a set of GCS. Otherwise, the wavelet transform is the special case of CS associated respectively with the Weyl-Heisenberg group (which gives the canonical CS) and with the affine group on the line. We recall the wavelet theory on R. As an application, we discuss the continuous Bessel wavelet. Thus, coherent state transformation (CST) and continuous Bessel wavelet transformation (CBWT) are defined. This chapter is mainly devoted to the application of the Bessel function.