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The dual pair $\big(U_q(\mathfrak{su}(1,1)),\mathfrak{o}_{q^{1/2}}(2n)\big)$, $q$-oscillators and Askey-Wilson algebras (1908.04277v1)

Published 12 Aug 2019 in math-ph and math.MP

Abstract: The universal Askey-Wilson algebra $AW(3)$ can be obtained as the commutant of $U_q(\mathfrak{su}(1,1))$ in $U_q(\mathfrak{su}(1,1)){\otimes3}$. We analyze the commutant of $\mathfrak{o}{q{1/2}}(2)\oplus\mathfrak{o}{q{1/2}}(2)\oplus\mathfrak{o}_{q{1/2}}(2)$ in $q$-oscillator representations of $\mathfrak{o}{q{1/2}}(6)$ and show that it also realizes $AW(3)$. These two pictures of $AW(3)$ are shown to be dual in the sense of Howe; this is made clear by highlighting the role of the intermediate Casimir elements of each members of the dual pair $\big(U_q(\mathfrak{su}(1,1)),\mathfrak{o}{q{1/2}}(6)\big)$. We also generalize these results. A higher rank extension of the Askey-Wilson algebra denoted $AW(n)$ can be defined as the commutant of $U_q(\mathfrak{su}(1,1))$ in $U_q(\mathfrak{su}(1,1)){\otimes n}$ and a dual description of $AW(n)$ as the commutant of $\mathfrak{o}{q{1/2}}(2){\oplus n}$ in $q$-oscillator representations of $\mathfrak{o}{q{1/2}}(2n)$ is offered by calling upon the dual pair $\big(U_q(\mathfrak{su}(1,1)),\mathfrak{o}_{q{1/2}}(2n)\big)$.

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