The abstract of the paper "Propagation estimates for N-body Stark Hamiltonians"

By Tadayoshi Adachi
Annales de l'Institut Henri Poincare -- Physique Theorique 62 (1995), 409--428.

We prove some propagation estimates for N-body Stark Hamiltonians. These estimates imply that p--Et=o(t) and x--Et²/2=o(t²) along the time evolution.