Long time behavior of stochastic hard ball systems
  We study the long time behavior of a system of $n=2,3$ Brownian hard balls, living in $\mathbb{R}^d$ for $d\ge2$, submitted to a mutual attraction and to elastic collisions. 
Patrick Cattiaux, Myriam Fradon, Alexei M. Kulik, Sylvie Roelly
math.ST math.PR stat.TH