This book develops limit theorems for a natural class of long range random walks on finitely generated torsion free nilpotent groups. The limits in these limit theorems are Lévy processes on some simply connected nilpotent Lie groups. Both the limit Lévy process and the limit Lie group carrying this process are determined by and depend on the law of the original random walk. The book offers the first systematic study of such limit theorems involving stable-like random walks and stable limit Lévy processes in the context of (non-commutative) nilpotent groups.
Provides a systematic study of functional limit theorem for long-jump random walks on nilpotent groups Gives a companion local limit theorem relating the densities of of the associated processes Presents a new constructive characterization of symmetric Lévy processes on nilpotent groups
Zhen-Qing Chen
Long range random walk Nilpotent group Group dilation Weak convergence Lévy Process Dirichlet form Local limit theorem