Szego asymptotics for matrix-valued measures with countably many bound states

Details Szego asymptotics for matrix-valued measures with countably many bound states Szego asymptotics for matrix-valued measures with countably many bound states

2009-10-11

arxiv.org/abs/0910.1975v2

Mathematics

Spectral Theory

Scientific paper

Let $\mu$ be a matrix-valued measure with the essential spectrum a single interval and countably many point masses outside of it. Under the assumption that the absolutely continuous part of $\mu$ satisfies Szego's condition and the point masses satisfy a Blaschke-type condition, we obtain the asymptotic behavior of the orthonormal polynomials on and off the support of the measure. The result generalizes the scalar analogue of Peherstorfer-Yuditskii and the matrix-valued result of Aptekarev-Nikishin, which handles only a finite number of mass points.

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