Barycenters of measures transported by stochastic flows

Details Barycenters of measures transported by stochastic flows Barycenters of measures transported by stochastic flows

2005-07-22

arxiv.org/abs/math/0507460v1

Annals of Probability 2005, Vol. 33, No. 4, 1509-1543

Mathematics

Probability

Published at http://dx.doi.org/10.1214/009117905000000071 in the Annals of Probability (http://www.imstat.org/aop/) by the Ins

Scientific paper

10.1214/009117905000000071

We investigate the evolution of barycenters of masses transported by stochastic flows. The state spaces under consideration are smooth affine manifolds with certain convexity structure. Under suitable conditions on the flow and on the initial measure, the barycenter {Z_t} is shown to be a semimartingale and is described by a stochastic differential equation. For the hyperbolic space the barycenter of two independent Brownian particles is a martingale and its conditional law converges to that of a Brownian motion on the limiting geodesic. On the other hand for a large family of discrete measures on suitable Cartan-Hadamard manifolds, the barycenter of the measure carried by an unstable Brownian flow converges to the Busemann barycenter of the limiting measure.

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