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arXiv · 1511.02446

Rotationally invariant ensembles of integrable matrices

Emil A. Yuzbashyan·B. Sriram Shastry·Jasen A. Scaramazza
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Abstract

We construct ensembles of random integrable matrices with any prescribed number of nontrivial integrals and formulate integrable matrix theory (IMT) -- a counterpart of random matrix theory (RMT) for quantum integrable models. A type-M family of integrable matrices consists of exactly N-M independent commuting N-by-N matrices linear in a real parameter. We first develop a rotationally invariant parametrization of such matrices, previously only constructed in a preferred basis. For example, an arbitrary choice of a vector and two commuting Hermitian matrices defines a type-1 family and vice versa. Higher types similarly involve a random vector and two matrices. The basis-independent formulation allows us to derive the joint probability density for integrable matrices, in a manner similar to the construction of Gaussian ensembles in the RMT.

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Emil A. Yuzbashyan, B. Sriram Shastry, Jasen A. Scaramazza. 2016-05-19. Rotationally invariant ensembles of integrable matrices. https://doi.org/10.1103/physreve.93.052114

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