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

## TL;DR

This paper explores the symmetry algebra of the S3 Dunkl Dirac equation, revealing a deformation of the classical angular momentum algebra and classifying its finite-dimensional irreducible representations.

## Contribution

It explicitly characterizes the symmetry algebra related to the S3 Dunkl Dirac operator and classifies its finite-dimensional irreducible and unitary representations.

## Key findings

- The symmetry algebra is a one-parameter deformation of so(3).
- All finite-dimensional irreducible representations are classified.
- Explicit eigenfunctions are constructed using Jacobi polynomials.

## 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.