Geometric Ergodicity of a Hypoelliptic Diffusion Modelling The   Melt-Spinning Process of Nonwoven Materials
  We analyze the large time behavior of a stochastic model for the lay-down of fibers on a conveyor belt in the production process of nonwovens. It is shown, that under weak conditions this degenerate diffusion process is strong mixing, confirming a conjecture of Grothaus and Klar. Moreover, under some additional assumptions even geometric ergodicity is established using probabilistic tools -- described in the book of Meyn and Tweedie -- in combination with methods from stochastic analysis. 
Martin Kolb, Mladen Savov and Achim Wubker
math.PR math.AP math.SP