The Lebesgue decomposition of the free additive convolution of two probability distributions

Details The Lebesgue decomposition of the free additive convolution of two probability distributions The Lebesgue decomposition of the free additive convolution of two probability distributions

2006-03-03

arxiv.org/abs/math/0603104v2

Mathematics

Operator Algebras

22 pages, latex. Numerous small changes, clarifications and corrections. To appear in Probab. Theory Related Fields

Scientific paper

We prove that the free additive convolution of two Borel probability measures supported on the real line can have a component that is singular continuous with respect to the Lebesgue measure on the real line only if one of the two measures is a point mass. The density of the absolutely continuous part with respect to the Lebesgue measure is shown to be analytic wherever positive and finite. The atoms of the free additive convolution of Borel probability measures on the real line have been described by Bercovici and Voiculescu in a previous paper.

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