On a family of domains associated with $μ$-synthesis in $M_2(\mathbb C)$

Abstract

In this paper, we show that the domain $\mathbb H$ serves as a unifying domain for $\mathbb G_2, \mathbb E$ and $\mathbb P$ by proving that each of these domains is an analytic retract of $\mathbb H$. Further, we prove that the bidisc $\mathbb D^2$ and the Euclidean unit ball $\mathbb B_2$ are also analytic retracts of $\mathbb H$. Then the rational $\overline{\mathbb H}$-inner functions, i.e., the rational maps from $\mathbb D$ into $\overline{\mathbb H}$ whose boundary values lie in the distinguished boundary of $\mathbb H$, are characterized. Two different versions of Schwarz type lemma for $\mathbb H$ are established of which one provides a necessary and sufficient condition. Finally, capitalizing on the theory of $\mathbb H$, we present alternative proofs to a few known results on $\mathbb P$ from the literature.