Abstract
A one-dimensional Lorentz-type model is studied where a point particle is reflected with some given probability p off randomly located fixed scatterers. The diffusion constant is calculated exactly, and the velocity autocorrelation is shown to decay like t −3 2 , for 0< p<1. For finite times, there are oscillations superimposed on this power decay. For p → 1, these oscillations dominate the behaviour for all times.
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