Right limits and reflectionless measures for CMV matrices

Details Right limits and reflectionless measures for CMV matrices Right limits and reflectionless measures for CMV matrices

2009-02-10

arxiv.org/abs/0902.1571v1

Mathematics

Spectral Theory

Scientific paper

We study CMV matrices by focusing on their right-limit sets. We prove a CMV version of a recent result of Remling dealing with the implications of the existence of absolutely continuous spectrum, and we study some of its consequences. We further demonstrate the usefulness of right limits in the study of weak asymptotic convergence of spectral measures and ratio asymptotics for orthogonal polynomials by extending and refining earlier results of Khrushchev. To demonstrate the analogy with the Jacobi case, we recover corresponding previous results of Simon using the same approach.

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