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AIP conference proceedings

Non uniqueness and equivalence of the q-deformed Weyl-Heisenberg algebra representations

Noureddine Boucerredj, N. Mebarki

Published Jan 1, 2012• 0 citations
Publisher

Abstract

The non uniqueness and equivalence of the q-deformed Weyl-Heinsenberg algebra are studied in the weak deformation parameter approximation. It turns out that the Macfarlane representation is not unique leading to inequivalant solutions of the q-deformed coherent states. Moreover, it is shown that the Krolikowski representation gives also a completely different result for the same algebra.

DOI
10.1063/1.4715442

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The non uniqueness and equivalence of the q-deformed Weyl-Heinsenberg algebra are studied in the weak deformation parameter approximation. It turns out that the Macfarlane representation is not unique leading to inequivalant solutions of the q-deformed coherent states. Moreover, it is shown that the Krolikowski representation gives also a completely different result for the same algebra.
In the weak deformation (WD) approximation of the Weyl–Heisenberg algebra, the corresponding generalized coherent states and displacement operator are constructed. It is shown that those states, and contrary to the non-deformed Weyl-Heisenberg algebra, are not eigenstates of the annihilation operator. Moreover, and as an alternative to the Chaïchian et al. Q-deformed path integral approach (where Q is the deformation parameter), using the Bargmann Fock representation, we propose in the WD approximation, a general simple formalism. As an application, we calculate the propagator and the wave function of the harmonic oscillator.PACS Nos.: 03.65.Fd, 31.15.Kb
In two-dimensional space a subtle point that for the case of both space–space and momentum–momentum non-commuting, different from the case of only space–space non-commuting, the deformed Heisenberg–Weyl algebra in non-commutative space is not completely equivalent to the undeformed Heisenberg–Weyl algebra in commutative space is clarified. It follows that there is no well-defined procedure to construct the deformed position–position coherent state or the deformed momentum–momentum coherent state from the undeformed position–momentum coherent state. Identifications of the deformed position–position and deformed momentum–momentum coherent states with the lowest energy states of a cold Rydberg atom in special conditions and a free particle, respectively, are demonstrated.
Les états cohérents qui sont des superpositions linéaires de tous les états stationnaires, jouent un grand rôle dans la mécanique quantique, et peuvent être considérés comme liens avec la mécanique classique. Nous avons étudié les états cohérents dans un cadre plus général de la quantification qui est la théorie de déformation.Nous avons étudié aussi les états cohérents du groupe de Weyl-Heisenberg q-déformé en généralisant la représentation de Macfarlane pour les opérateurs de création et d'annihilation q-déformés.Finalement, nous avons étudié les états cohérents de l’algèbre de W. H. q-déformée dans la représentation de configuration
We discuss the q deformation of Weyl-Heisenberg algebra in connection with the von Neumann theorem in Quantum Mechanics. We show that the q-deformation parameter labels the Weyl systems in Quantum Mechanics and the unitarily inequivalent representations of the canonical commutation relations in Quantum Field Theory. The von Neumann theorem in Quantum Mechanics (QM) states that for systems with finite number of degrees of freedom the representations of the canonical commutation relations (ccr), also called the Weyl representations, are each other unitarily equivalent. In the limit of infinite number of degrees of freedom, namely in Quantum Field Theory