title: Self-diffusion in granular gases
abstract: The coefficient of self-diffusion for a homogeneously cooling granular gas changes significantly if the impact-velocity dependence of the restitution coefficient epsilon is taken into account. For the case of a constant epsilon the particles spread logarithmically slowly with time, whereas a velocity-dependent coefficient yields a power law time dependence. The impact of the difference in these time dependences on the properties of a freely cooling granular gas is discussed.
authors.affiliation: Physics Department, Moscow State University, Moscow 119899, Russia and Humboldt-Universitat, Institut fur Physik, Invalidenstrasse 110, D-10115 Berlin, Germany.
authors.initials: NV
authors.lastname: Brilliantov
authors.initials: T
authors.lastname: Poschel