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The generalized Racah algebra as a commutant

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arxiv 1808.09518 v1 pith:G6PPLKGK submitted 2018-08-28 math-ph math.MP

classification math-phmath.MP
keywords algebramathfrakcommutantracaharisingcarrycasimircontext
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abstract

The Racah algebra $R(n)$ of rank $(n-2)$ is obtained as the commutant of the \mbox{$\mathfrak{o}(2)^{\oplus n}$} subalgebra of $\mathfrak{o}(2n)$ in oscillator representations of the universal algebra of $\mathfrak{o}(2n)$. This result is shown to be related in a Howe duality context to the definition of $R(n)$ as the algebra of Casimir operators arising in recouplings of $n$ copies of $\mathfrak{su}(1,1)$. These observations provide a natural framework to carry out the derivation by dimensional reduction of the generic superintegrable model on the $(n-1)$ sphere which is invariant under $R(n)$.

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Cited by 2 Pith papers

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