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DY: Fachverband Dynamik und Statistische Physik

DY 13: Granular Matter/ Contact Dynamics II

DY 13.1: Hauptvortrag

Mittwoch, 24. März 2010, 09:30–10:00, H47

Glass transition in driven granular fluids — •Annette Zippelius¹, Till Kranz¹, and Matthias Sperl² — ¹Institut für Theoretische Physik, Universität Göttingen, Friedrich-Hund Platz 1, 37077 Göttingen — ²Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt, 51170 Köln

We study a homogeneously driven granular fluid at high volume fractions. A mode-coupling theory is derived for the stationary, non-equilibrium state, which is reached, when dissipation due to inelastic collisions is balanced by the driving, which is applied to the bulk of the fluid. As the density is increased beyond a critical value n_c we observe a glass transition indicated by a time persistent part of the van Hove correlation function. The transition is qualitatively similar to the corresponding one in the elastic fluid with however different values for the critical density as well as the exponents which characterize the slow dynamics preceding structural arrest. We also present results of event driven simulations, which reveal a plateau in the mean square displacement and a strong decrease of the diffusion constant as the glass transition is approached.