BMO Estimates for the $H^{\infty}(\mathbb{B}_n)$ Corona Problem

Details BMO Estimates for the $H^{\infty}(\mathbb{B}_n)$ Corona Problem BMO Estimates for the $H^{\infty}(\mathbb{B}_n)$ Corona Problem

2009-05-10

arxiv.org/abs/0905.1476v1

J. Funct. Anal. 258 (2010), no. 11, 3818--3840

Mathematics

Classical Analysis and ODEs

v1: 20 pgs

Scientific paper

10.1016/j.jfa.2009.12.015

We study the $H^{\infty}(\mathbb{B}_{n})$ Corona problem $\sum_{j=1}^{N}f_{j}g_{j}=h$ and show it is always possible to find solutions $f$ that belong to $BMOA(\mathbb{B}_{n})$ for any $n>1$, including infinitely many generators $N$. This theorem improves upon both a 2000 result of Andersson and Carlsson and the classical 1977 result of Varopoulos. The former result obtains solutions for strictly pseudoconvex domains in the larger space $H^{\infty}\cdot BMOA$ with $N=\infty $, while the latter result obtains $BMOA(\mathbb{B}_{n})$ solutions for just N=2 generators with $h=1$. Our method of proof is to solve $\overline{\partial}$-problems and to exploit the connection between $BMO$ functions and Carleson measures for $H^{2}(\mathbb{B}_{n})$. Key to this is the exact structure of the kernels that solve the $\overline{\partial}$ equation for $(0,q)$ forms, as well as new estimates for iterates of these operators. A generalization to multiplier algebras of Besov-Sobolev spaces is also given.

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