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Composition operators on hardy spaces on Lavrentiev domains

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Gallardo Gutiérrez, Eva A. and González, María J. and Nicolau, Arthur (2008) Composition operators on hardy spaces on Lavrentiev domains. Transactions of the American Mathematical Society, 360 (1). pp. 395-410. ISSN 0002-9947

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Official URL: http://www.ams.org/journals/tran/2008-360-01/S0002-9947-07-04310-3/S0002-9947-07-04310-3.pdf


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Abstract

For any simply connected domain., we prove that a Littlewood type inequality is necessary for boundedness of composition operators on H-p(Omega), 1 <= p < infinity, whenever the symbols are finitely-valent. Moreover, the corresponding "little-oh" condition is also necessary for the compactness. Nevertheless, it is shown that such an inequality is not sufficient for characterizing bounded composition operators even induced by univalent symbols. Furthermore, such inequality is no longer necessary if we drop the extra assumption on the symbol of being finitely-valent. In particular, this solves a question posed by Shapiro and Smith (2003). Finally, we show a striking link between the geometry of the underlying domain. and the symbol inducing the composition operator in H-p(Omega), and in this sense, we relate both facts characterizing bounded and compact composition operators whenever. is a Lavrentiev domain.


Item Type:Article
Uncontrolled Keywords:composition operator; Lavrentiev domain; Nevanlinna counting function
Subjects:Sciences > Mathematics > Mathematical analysis
ID Code:21067
Deposited On:25 Apr 2013 08:51
Last Modified:10 Aug 2018 11:04

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