Abstract
The boundaries of a semi-simple Lie group G in this paper are slightly more general than Furstenberg's boundaries. The horizontal diffusion gt in G induces a stochastic flow on any boundary of G, whose one point motion is a Brownian motion. The global and local stability of the flow are established, using the limiting property of gt under the Iwasawa decomposition. The Lyapunov spectrum contains only negative exponents and the associated filtration are determined by the root space structure of G. In this way, we obtain many interesting examples of Lie group-valued stochastic flows on compact spaces, including the gradient flow and other finite dimensional flows on spheres
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