Abstract
We study several kinds of polynomial ensembles of derivative type which we propose to call Pólya ensembles. These ensembles are defined on the spaces of complex square, complex rectangular, Hermitian, Hermitian antisymmetric and Hermitian anti-self-dual matrices, and they have nice closure properties under the multiplicative convolution for the first class and under the additive convolution for the other classes. The cases of complex square matrices and Hermitian matrices were already studied in former works. One of our goals is to unify and generalize the ideas to the other classes of matrices. Here, we consider convolutions within the same class of Pólya ensembles as well as convolutions with the more general class of polynomial ensembles. Moreover, we derive some general identities for group integrals similar to the Harish–Chandra–Itzykson–Zuber integral, and we relate Pólya ensembles to Pólya frequency functions. For illustration, we give a number of explicit examples for our results.
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Acknowledgements
We want to thank Gernot Akemann, Friedrich Götze and Arno Kuijlaars for fruitful discussions on this topic. Moreover, we acknowledge support by CRC 701 “Spectral Structures and Topological Methods in Mathematics” as well as by grant AK35/2-1 “Products of Random Matrices”, both funded by Deutsche Forschungsgemeinschaft (DFG). The work of Yanik-Pascal Förster was formerly supported by Studienstiftung des deutschen Volkes.
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Förster, YP., Kieburg, M. & Kösters, H. Polynomial Ensembles and Pólya Frequency Functions. J Theor Probab 34, 1917–1950 (2021). https://doi.org/10.1007/s10959-020-01030-z
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DOI: https://doi.org/10.1007/s10959-020-01030-z
Keywords
- Probability measures on matrix spaces
- Sums and products of independent random matrices
- Polynomial ensembles
- Additive convolution
- Multiplicative convolution
- Pólya frequency functions
- Fourier transform
- Hankel transform
- Spherical transform