Multi-variable subordination distributions for free additive convolution

Details Multi-variable subordination distributions for free additive convolution Multi-variable subordination distributions for free additive convolution

2008-10-14

arxiv.org/abs/0810.2571v2

Mathematics

Operator Algebras

Minor modifications and reference added to 1st version. 34 pages, no figures

Scientific paper

Let k be a positive integer and let D_k denote the space of joint distributions for k-tuples of selfadjoint elements in C*-probability space. The paper studies the concept of "subordination distribution of \mu \boxplus \nu with respect to \nu" for \mu, \nu \in D_k, where \boxplus is the operation of free additive convolution on D_k. The main tools used in this study are combinatorial properties of R-transforms for joint distributions and a related operator model, with operators acting on the full Fock space Multi-variable subordination turns out to have nice relations to a process of evolution towards \boxplus-infinite divisibility on D_k that was recently found by Belinschi and Nica (arXiv:0711.3787). Most notably, one gets better insight into a connection which this process was known to have with free Brownian motion.

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