Dynamics and interpretation of some integrable systems via matrix orthogonal polynomials |
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Authors: | A Branquinho A Foulquié Moreno |
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Institution: | 1. CMUC, Department of Mathematics, University of Coimbra, Coimbra, Portugal;2. CIDMA, Department of Mathematics, University of Aveiro, Aveiro, Portugal |
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Abstract: | In this work we characterize a high-order Toda lattice in terms of a family of matrix polynomials orthogonal with respect to a complex matrix measure. In order to study the solution of this dynamical system, we give explicit expressions for the Weyl function, generalized Markov function, and we also obtain, under some conditions, a representation of the vector of linear functionals associated with this system. We show that the orthogonality is embedded in these structure and governs the high-order Toda lattice. We also present a Lax-type theorem for the point spectrum of the Jacobi operator associated with a Toda-type lattice. |
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Keywords: | Matrix orthogonal polynomials linear functional recurrence relation operator theory matrix Sylvester differential equations Toda-type systems Lax-type theorem |
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