**Memoirs of the American Mathematical Society**

2004;
81 pp;
Softcover

MSC: Primary 47;
Secondary 30

Print ISBN: 978-0-8218-3432-9

Product Code: MEMO/167/791

List Price: $60.00

AMS Member Price: $36.00

MAA member Price: $54.00

**Electronic ISBN: 978-1-4704-0389-8
Product Code: MEMO/167/791.E**

List Price: $60.00

AMS Member Price: $36.00

MAA member Price: $54.00

# The Role of the Spectrum in the Cyclic Behavior of Composition Operators

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*Eva A. Gallardo-Gutiérrez; Alfonso Montes-Rodríguez*

A bounded operator \(T\) acting on a Hilbert space \(\mathcal H\) is called cyclic if there is a vector \(x\) such that the linear span of the orbit \(\{T^n x : n \geq 0 \}\) is dense in \(\mathcal H\). If the scalar multiples of the orbit are dense, then \(T\) is called supercyclic. Finally, if the orbit itself is dense, then \(T\) is called hypercyclic. We completely characterize the cyclicity, the supercyclicity and the hypercyclicity of scalar multiples of composition operators, whose symbols are linear fractional maps, acting on weighted Dirichlet spaces. Particular instances of these spaces are the Bergman space, the Hardy space, and the Dirichlet space. Thus, we complete earlier work on cyclicity of linear fractional composition operators on these spaces. In this way, we find exactly the spaces in which these composition operators fail to be cyclic, supercyclic or hypercyclic. Consequently, we answer some open questions posed by Zorboska. In almost all the cases, the cut-off of cyclicity, supercyclicity or hypercyclicity of scalar multiples is determined by the spectrum. We will find that the Dirichlet space plays a critical role in the cut-off.

#### Readership

Graduate students and research mathematicians interested in operator theory.

#### Table of Contents

# Table of Contents

## The Role of the Spectrum in the Cyclic Behavior of Composition Operators

- Contents v6 free
- Preface ix10 free
- Chapter 1. Introduction and Preliminaries 112 free
- Chapter 2. Linear Fractional Maps with an Interior Fixed Point 1324
- Chapter 3. Non Elliptic Automorphisms 3546
- Chapter 4. The Parabolic Non Automorphism 4859
- Chapter 5. Supercyclic Linear Fractional Composition Operators 6677
- Endnotes 7788
- Bibliography 7990