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Spectra of composition operators on the bloch and bergman spaces

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Abstract

Whenϕ is an analytic map of the unit diskU into itself, andX is a Banach space of analytic functions onU, define the composition operatorC ϕ byC ϕ (f)=f o ϕ, forfX. In this paper we show how to use the Calderón theory of complex interpolation to obtain information on the spectrum ofC ϕ (under suitable hypotheses onϕ) acting on the Bloch spaceB and BMOA, the space of analytic functions in BMO. To do this we first obtain some results on the essential spectral radius and spectrum ofC ϕ on the Bergman spacesA pand Hardy spacesH p,spaces which are connected toB and BMOA by the interpolation relationships [A 1,B] t =A pand [H 1,BMOA] t =H pfor 1=p(1−t).

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MacCluer, B., Saxe, K. Spectra of composition operators on the bloch and bergman spaces. Isr. J. Math. 128, 325–354 (2002). https://doi.org/10.1007/BF02785430

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