Abstract
The very classical Ehrenfest urn model can be solved exactly in terms of Krawtchouk polynomials. I consider a natural extension of this model which goes beyond “nearest neighbours” random walks and whose analysis benefits from the study of a family of matrix-valued orthogonal polynomials. This subject was started by M.G. Krein around 1949. This paper shows one more example of his vast and lasting legacy in the never-ending task of finding new mathematical tools to analyze the physical world.
The author was supported in part by NSF Grant # DMS 0603901.
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To the memory of Prof. Mark G. Krein, with gratitude.
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Alberto Grünbaum, F. (2009). Block Tridiagonal Matrices and a Beefed-up Version of the Ehrenfest Urn Model. In: Adamyan, V.M., et al. Modern Analysis and Applications. Operator Theory: Advances and Applications, vol 190. Birkhäuser Basel. https://doi.org/10.1007/978-3-7643-9919-1_15
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