Noncommutative hyperbolic geometry on the unit ball of $B(H)^n$

Details Noncommutative hyperbolic geometry on the unit ball of $B(H)^n$ Noncommutative hyperbolic geometry on the unit ball of $B(H)^n$

2008-10-03

arxiv.org/abs/0810.0644v3

J. Funct. Anal. 256 (2009), 4030-4070

Mathematics

Functional Analysis

29 pages

Scientific paper

In this paper we introduce a hyperbolic distance $\delta$ on the noncommutative open ball $[B(H)^n]_1$, where $B(H)$ is the algebra of all bounded linear operators on a Hilbert space $H$, which is a noncommutative extension of the Poincare-Bergman metric on the open unit ball of $C^n$. We prove that $\delta$ is invariant under the action of the group $Aut([B(H)^n]_1)$ of all free holomorphic automorphisms of $[B(\cH)^n]_1$, and show that the $\delta$-topology and the usual operator norm topology coincide on $[B(H)^n]_1$. Moreover, we prove that $[B(H)^n]_1$ is a complete metric space with respect to the hyperbolic metric and obtained an explicit formula for $\delta$ in terms of the reconstruction operator. A Schwarz-Pick lemma for bounded free holomorphic functions on $[B(H)^n]_1$, with respect to the hyperbolic metric, is also obtained.

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