Random walkers versus random crowds: diffusion of large matrices

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We briefly review the random matrix theory for large N by N matrices viewed as free random variables in a context of stochastic diffusion. We establish a surprising link between the spectral properties of matrix-valued multiplicative diffusion processes for hermitian and unitary ensembles.
8 pages, no figures, talk presented at the conference "Complex Systems: New Trends and Expectations", Santander, Spain, 5-9 June 2006

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