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DY: Fachverband Dynamik und Statistische Physik

DY 22: Statistical Physics (general)

DY 22.3: Talk

Wednesday, March 13, 2013, 15:30–15:45, H48

Common features of simple water models — •Lotta Heckmann and Barbara Drossel — Institut für Festkörperphysik, TU Darmstadt, Germany

The rich phase diagram and the anomalies of water continue to inspire theoretical and numerical studies. Simplified models for water that do not aim at accurately describing molecular structure, but rather at matching general properties of water, have been successful at revealing the mechanisms and principles behind the special behaviour of this substance. In particular, the association of a lower local density with a stronger binding energy is an important ingredient in such models. Several models have been introduced that include this feature and that produce, among other transitions, phase transitions between a high-density and a low-density liquid phase. We compare three of these models, which are at first sight rather different, and investigate in particular the water anomalies and the phase transition line between the two liquid phases of these models. Our objective is to identify common characteristics and to extract the minimal ingredients required for a successful water model.