Abstract
We consider Gaussian elliptic random matrices X of a size \(N \times N\) with parameter \(\rho \), i.e., matrices whose pairs of entries \((X_{ij}, X_{ji})\) are mutually independent Gaussian vectors with \(\mathbb {E}\,X_{ij} = 0\), \(\mathbb {E}\,X^2_{ij} = 1\) and \(\mathbb {E}\,X_{ij} X_{ji} = \rho \). We are interested in the asymptotic distribution of eigenvalues of the matrix \(W =\frac{1}{N^2} X^2 X^{*2}\). We show that this distribution is determined by its moments, and we provide a recurrence relation for these moments. We prove that the (symmetrized) asymptotic distribution is determined by its free cumulants, which are Narayana polynomials of type B:
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Acknowledgments
The authors are grateful for fruitful discussions with Pavel Galashin and Mikhail Basok. The authors thank the anonymous reviewer for valuable comments, which helped in improving the quality of the paper.
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N. Alexeev has been supported by the Grant of Russian Scientific Foundation 14-11-00581. A. Tikhomirov has been supported by SFB 701 Spectral Structures and Topological Methods in Mathematics University of Bielefeld, by Russian Foundation for Basic Research Grant 14-01-00500 and by Program of Fundamental Research Ural Division of RAS, Project N15-16-1-3.
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Alexeev, N., Tikhomirov, A. Singular Values Distribution of Squares of Elliptic Random Matrices and Type B Narayana Polynomials. J Theor Probab 30, 1170–1190 (2017). https://doi.org/10.1007/s10959-016-0685-5
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DOI: https://doi.org/10.1007/s10959-016-0685-5