Quantum spaces, central extensions of Lie groups and related quantum field theories

Quantum spaces with $\mathfrak{s}\mathfrak{u}(2)$ noncommutativity can be modelled by using a family of $SO(3)$-equivariant differential ${}^{\ast }$-representations. The quantization maps are determined from the combination of the Wigner theorem for $SU(2)$ with the polar decomposition of the quantized plane waves. A tracial star-product, equivalent to the Kontsevich product for the Poisson manifold dual to $\mathfrak{s}\mathfrak{u}(2)$ is obtained from a subfamily of differential ${}^{\ast }$-representations. Noncommutative (scalar) field theories free from UV/IR mixing and whose commutative limit coincides with the usual ${\varphi }^4$ theory on ${\mathbb{R}}^3$ are presented. A generalization of the construction to semi-simple possibly non simply connected Lie groups based on their central extensions by suitable abelian Lie groups is discussed.