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Wishart processes : mean-field limit, long time behavior, and free probability
Ezechiel Kahn · 2020-09-21 · via math.PR updates on arXiv.org

This paper is devoted to the study of the eigenvalues of the Wishart process which are the analogof the Dyson Brownian Motion for covariance matrices. Such processes were in particular studied byBru. The mean field convergence of the empirical measure of these eigenvalues was proved Malecki andPerez. In this paper, we provide a new approach to the mean field convergence problem using toolsfrom the free rectangular convolution theory developed by Benaych-Georges, which in particular allowsto compute explicitly the limit measure valued flow. We highlight the link with the integro-differentialequation related to the mean field limit and its translation into a complex Burgers partial differentialequation.

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