Dresden 2006 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 27: Granular Matter and Contact Dynamics II

DY 27.6: Vortrag

Dienstag, 28. März 2006, 17:45–18:00, SCH 251

Wet granular matter: A two component non-Abelian sandpile model — •Christoph Kohlhammer and Michael Schulz — Universität Ulm, Abteilung Theoretische Physik, Albert Einstein-Allee 11, 89069 Ulm

We consider a two component non-Abelian sandpile model reflecting several important properties of wet granular matter. By introducing appropriate threshold conditions and consitent toppling rules we obtain a model with SOC behaviour. On the basis of fluctuations of the dissipative work we define a temperature of the granular system and show its connection to the avalanche size. In particular, we find that our temperature, defined above, characterizes the tension of the sandpile. These tensions are influenced by resonances leading to very sharp extrema and phase transitions. Computer simulations show a broken renormalisation exponent which can be shown to be equivalent to that of the well known Abelian sandpile models. The particle density as a system size independent variable delivers also indications of a phase transition as a function of the relation between wet and dry particles.