$θ(\hat{x},\hat{p})-$deformation of the harmonic oscillator in a $2D-$phase space

Abstract: This work addresses a ${\theta}(\hat{x},\hat{p})-$deformation of the harmonic oscillator in a $2D-$phase space. Specifically, it concerns a quantum mechanics of the harmonic oscillator based on a noncanonical commutation relation depending on the phase space coordinates. A reformulation of this deformation is considered in terms of a $q-$deformation allowing to easily deduce the energy spectrum of the induced deformed harmonic oscillator. Then, it is proved that the deformed position and momentum operators admit a one-parameter family of self-adjoint extensions. These operators engender new families of deformed Hermite polynomials generalizing usual $q-$ Hermite polynomials. Relevant matrix elements are computed. Finally, a $su(2)-$algebra representation of the considered deformation is investigated and discussed.