Weakly $\mathcal{U}(d)$-homogeneous commuting tuple of bounded operators

Abstract

We introduce and study the weakly $\mathcal{U}(d)$-homogeneous commuting tuple of operators. We provide a sufficient condition under which a weakly $\mathcal{U}(d)$-homogeneous tuple is similar to a $\mathcal{U}(d)$-homogeneous tuple. Further, we focus our attention to multishifts and completely characterize weakly $\mathcal{U}(d)$-homogeneous multishifts. In particular, we show that a multishift is weakly $\mathcal{U}(d)$-homogeneous if and only if it similar to a $\mathcal{U}(d)$-homogeneous multishift. The results for multishifts are further refined for the class of spherically balanced multishifts.

This is a preliminary draft consisting of 17 pages. A more detailed and revised version will be available soon