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arXiv · 1705.08751

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

Hendrik De Bie·Roy Oste·Joris Van der Jeugt
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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.

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Hendrik De Bie, Roy Oste, Joris Van der Jeugt. 2017-05-24. The total angular momentum algebra related to the $\mathrm{S}_3$ Dunkl Dirac equation. https://doi.org/10.1016/j.aop.2017.12.015

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