Contractive Hilbert modules on quotient domains

Abstract

Let the complex reflection group $G(m,p,n)$ act on the unit polydisc $\mathbb D^n$ in $\mathbb C^n.$ A $\boldsymbolΘ_n$-contraction is a commuting tuple of operators on a Hilbert space having $$\overline{\boldsymbolΘ}_n:=\{\boldsymbolθ(z)=(θ_1(z),\ldots,θ_n(z)):z\in\overline{\mathbb D}^n\}$$ as a spectral set, where $\{θ_i\}_{i=1}^n$ is a homogeneous system of parameters associated to $G(m,p,n).$ A plethora of examples of $\boldsymbolΘ_n$-contractions is exhibited. Under a mild hypothesis, it is shown that these $\boldsymbolΘ_n$-contractions are mutually unitarily inequivalent. These inequivalence results are obtained concretely for the weighted Bergman modules under the action of the permutation groups and the dihedral groups. The division problem is shown to have negative answers for the Hardy module and the Bergman module on the bidisc. A Beurling-Lax-Halmos type representation for the invariant subspaces of $\boldsymbolΘ_n$-isometries is obtained.