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arXiv 1705.08751math-phhep-thmath.CAmath.MPmath.RTquant-ph
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与$\mathrm{S}_3$ Dunkl Dirac方程有关的全angular momentum代数

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

Hendrik De Bie, Roy Oste, Joris Van der Jeugt

摘要:

我们考虑由总角动量算符产生的对称代数,表现为$\mathrm{S}_3$ Dunkl Dirac方程的运动常数。后者是狄拉克方程通过Dunkl算子的变形,在我们的情况下,与根系$A_2$相关联,具有相应的Weyl群$\mathrm{S}_3$,三个元素上的对称群。在这种情况下,对称代数的显式形式是经典总角动量代数$\mathfrak{so}(3)$的单参数变形,其中包含$\mathrm{S}_3$的元素。这是利用最近的结果对称代数一类狄拉克运营商,特别是包含的狄拉克Dunkl运营商的任意根系。对于这个对称代数,我们分类所有的有限维,不可约表示,并确定条件的表示是unitarizable。酉不可约表示类允许作用于狄拉克哈密顿本征函数的表示空间的自然实现。使用柯西-Kowalevsky扩展定理,我们得到明确的表达这些特征函数的雅可比多项式。

英文摘要:

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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