Abstract
We study thin interpolating sequences \(\{\lambda _n\}\) and their relationship to interpolation in the Hardy space \(H^2\) and the model spaces \(K_\Theta = H^2 \ominus \Theta H^2\), where \(\Theta \) is an inner function. Our results, phrased in terms of the functions that do the interpolation as well as Carleson measures, show that under the assumption that \(\Theta (\lambda _n) \rightarrow 0\) the interpolation properties in \(H^2\) are essentially the same as those in \(K_\Theta \).
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References
Agler, J., McCarthy, J.E.: Pick interpolation and Hilbert function spaces. Graduate Studies in Mathematics. American Mathematical Society, Providence, RI (2002)
Axler, S., Gorkin, P.: Divisibility in Douglas algebras. Mich. Math. J. 31(1), 89–94 (1984)
Chalendar, I., Fricain, E., Timotin, D.: Functional models and asymptotically orthonormal sequences. Ann. Inst. Fourier (Grenoble) 53(5), 1527–1549 (2003)
Chang, S.Y.A.: A characterization of Douglas subalgebras. Acta Math. 137(2), 82–89 (1976)
Earl, J.P.: On the interpolation of bounded sequences by bounded functions. J. Lond. Math. Soc. 2, 544–548 (1970)
Earl, J.P.: A note on bounded interpolation in the unit disc. J. Lond. Math. Soc. (2) 13(3), 419–423 (1976)
Fricain, E.: Bases of reproducing kernels in model spaces. J. Oper. Theory 46(3), 517–543 (2001)
Garnett, J.B.: Bounded Analytic Functions. Pure and Applied Mathematics. Academic Press Inc. [Harcourt Brace Jovanovich Publishers], New York (1981)
Gorkin, P., Mortini, R.: Asymptotic interpolating sequences in uniform algebras. J. Lond. Math. Soc. (2) 67(2), 481–498 (2003)
Gorkin, P., Pott, S., Wick, B.: Thin sequences and their role in \(H^{p}\) theory, model spaces, and uniform algebras. Rev. Mat. Iberoam. (2015) (to appear)
Guillory, C., Izuchi, K., Sarason, D.: Interpolating Blaschke products and division in Douglas algebras. Proc. Roy. Irish Acad. Sect. A 84(1), 1–7 (1984)
Hoffman, K.: Banach spaces of analytic functions. Prentice-Hall Series in Modern Analysis, Prentice-Hall Inc, Englewood Cliffs, N. J. (1962)
Hosokawa, T., Izuchi, K., Zheng, D.: Isolated points and essential components of composition operators on \(H^\infty \). Proc. Am. Math. Soc. 130(6), 1765–1773 (2002). doi:10.1090/S0002-9939-01-06233-5
Lacey, M.T., Sawyer, E.T., Shen, C.-Y., Uriarte-Tuero, I., Wick, B.D.: Two Weight Inequalities for the Cauchy Transform from \(\mathbb{R}\) to \( \mathbb{C}_+\), J. Inst. Math. Jussieu (2014), 1–43, submitted, available at http://arxiv.org/abs/1310.4820
Marshall, D.E.: Subalgebras of \(L^{\infty }\) containing \(H^{\infty }\). Acta Math. 137(2), 91–98 (1976)
Nazarov, F., Volberg, A.: The Bellman function, the two-weight Hilbert transform, and embeddings of the model spaces \(K_\theta \). J. Anal. Math. 87, 385–414 (2002). Dedicated to the memory of Wolff, T.H
Nicolau, A., Ortega-Cerda, J., Seip, K.: The constant of interpolation. Pac. J. Math. 213(2), 389–398 (2004)
Nikol’skiĭ, N.K.: Treatise on the shift operator, Grundlehren der Mathematischen Wissenschaften [Fundamental Principles of Mathematical Sciences], vol. 273, Springer-Verlag, Berlin, (1986). Spectral function theory; With an appendix by Hruščev, S.V. [S. V. Khrushchëv] and V. V. Peller; Translated from the Russian by Jaak Peetre
Petermichl, S., Treil, S., Wick, B.D.: Carleson potentials and the reproducing kernel thesis for embedding theorems. Ill. J. Math. 51(4), 1249–1263 (2007)
Sarason, D.: Algebras of functions on the unit circle. Bull. Am. Math. Soc. 79, 286–299 (1973)
Shapiro, H.S., Shields, A.L.: On some interpolation problems for analytic functions. Am. J. Math. 83, 513–532 (1961)
Sundberg, C., Wolff, T.: Interpolating sequences for \(QA_B\). Trans. Am. Math. Soc. 276(2), 551–581 (1983)
Thomas, H.: Wolff, two algebras of bounded functions. Duke Math. J. 49(2), 321–328 (1982)
Vol’berg, A.L.: Two remarks concerning the theorem of S. Axler, S.-Y. A. Chang and D. Sarason. J. Oper. Theory 7(2), 209–218 (1982)
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Pamela Gorkin Research supported in part by Simons Foundation Grant 243653. Brett D. Wick Research supported in part by a National Science Foundation DMS Grant # 0955432.
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Communicated by Yura Lyubarskii.
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Gorkin, P., Wick, B.D. Thin Sequences and Their Role in Model Spaces and Douglas Algebras. J Fourier Anal Appl 22, 137–158 (2016). https://doi.org/10.1007/s00041-015-9414-1
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DOI: https://doi.org/10.1007/s00041-015-9414-1