This is an announcement for the paper "Noncommutative hyperbolic geometry on the unit ball of $B(H)^n$" by Gelu Popescu.

Abstract: 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.

Archive classification: math.FA math.OA

Mathematics Subject Classification: 46L52; 32F45; 47L25; 32Q45

Remarks: 29 pages, to appear in J. Funct. Anal

The source file(s), hyperbolic.tex: 116240 bytes, is(are) stored in gzipped form as 0810.0644.gz with size 30kb. The corresponding postcript file has gzipped size 78kb.

Submitted from: gelu.popescu@utsa.edu

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