Memory effect in friction on a particle caused by a system of fixed or moving scatterers with power law potential.
The memory function for friction on a particle caused by a system of fixed or moving scatterers is evaluated for power law interaction. For a dilute system the study extends the steady-state calculation based on the Boltzmann equation to the case of frequency dependence due to the dynamics of the scattering process. For a dense gas an Enskog approximation can be used. The power law potential leads to scaling behavior of the dynamical friction coefficient as a function of reduced mass, coupling coefficient, and energy.
Institut fur Theoretische Physik A, RWTH Aachen, Templergraben 55, 52056 Aachen, Germany. ufelder@physik.rwth-aachen.de
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Vehns