The total angular momentum algebra related to the ${\mathrm{S}}_3$ Dunkl Dirac equation

Abstract

We consider the symmetry algebra generated by the total angular momentum operators, appearing as constants of motion of the ${\mathrm{S}}_3$ Dunkl Dirac equation. The latter is a deformation of the Dirac equation by means of Dunkl operators, in our case associated to the root system $A_2$, with corresponding Weyl group ${\mathrm{S}}_3$, the symmetric group on three elements. The explicit form of the symmetry algebra in this case is a one-parameter deformation of the classical total angular momentum algebra $\mathfrak{so}(3)$, incorporating elements of ${\mathrm{S}}_3$. This was obtained using recent results on the symmetry algebra for a class of Dirac operators, containing in particular the Dirac-Dunkl operator for arbitrary root system. For this symmetry algebra, we classify all finite-dimensional, irreducible representations and determine the conditions for the representations to be unitarizable. The class of unitary irreducible representations admits a natural realization acting on a representation space of eigenfunctions of the Dirac Hamiltonian. Using a Cauchy-Kowalevsky extension theorem we obtain explicit expressions for these eigenfunctions in terms of Jacobi polynomials.

arXiv comment29 pages, 1 figure; New title, introduction and physics context

References in corpus (6)

• The Dunkl oscillator in the plane II : representations of the symmetry algebra
• The Dunkl oscillator in the plane I : superintegrability, separated wavefunctions and overlap coefficients
• On Dunkl angular momenta algebra
• A Dirac-Dunkl equation on $S^2$ and the Bannai-Ito algebra
• A Laplace-Dunkl equation on $S^2$ and the Bannai-Ito algebra
• A finite oscillator model with equidistant position spectrum based on an extension of $\mathfrak{su}(2)$

Cited by in corpus (5)

• On the algebra of symmetries of Laplace and Dirac operators
• Finite-dimensional representations of the symmetry algebra of the dihedral Dunkl--Dirac operator
• On symmetries of generalized Calogero model and Polychronakos-Frahm chain
• Dirac Operators for the Dunkl Angular Momentum Algebra
• An exceptional symmetry algebra for the 3D Dirac-Dunkl operator