Regensburg 2007 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 6: Glass II (joint session with DY)

DF 6.9: Vortrag

Dienstag, 27. März 2007, 17:10–17:30, H23

Long-time behavior of the velocity autocorrelation function in the overlapping Lorentz model — •Thomas Franosch and Felix Höfling — Arnold-Sommerfeld-Center for Theoretical Physics, LMU München, Germany

The long-time behavior of transport coefficients in the overlapping Lorentz model in two and three dimensions is investigated by means of extensive Molecular Dynamics simulations. The behavior of the velocity auto-correlation function can be rationalized in terms of a competition of the critical relaxation due to the underlying percolation transition and the hydrodynamic power-law anomalies. In two dimensions and in the absence of a diffusive mode, another power law anomaly due to trapping is found with an exponent -3 instead of -2. Further, the logarithmic divergence of the super Burnett coefficient is corroborated in the dilute limit; at finite density, however, it is dominated by a linear divergence.