An equilibrium problem for the limiting eigenvalue distribution of banded Toeplitz matrices

Details An equilibrium problem for the limiting eigenvalue distribution of banded Toeplitz matrices An equilibrium problem for the limiting eigenvalue distribution of banded Toeplitz matrices

2007-04-03

arxiv.org/abs/0704.0378v1

Mathematics

Complex Variables

28 pages; 7 figures

Scientific paper

We study the limiting eigenvalue distribution of $n\times n$ banded Toeplitz matrices as $n\to \infty$. From classical results of Schmidt-Spitzer and Hirschman it is known that the eigenvalues accumulate on a special curve in the complex plane and the normalized eigenvalue counting measure converges weakly to a measure on this curve as $n\to\infty$. In this paper, we characterize the limiting measure in terms of an equilibrium problem. The limiting measure is one component of the unique vector of measures that minimes an energy functional defined on admissible vectors of measures. In addition, we show that each of the other components is the limiting measure of the normalized counting measure on certain generalized eigenvalues.

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