Dresden 2006 – wissenschaftliches Programm

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PV: Plenarvorträge

PV VI

PV VI: Preisträgervortrag

Dienstag, 28. März 2006, 13:15–14:00, HSZ 04

Glassy Relaxation: a Paradigm for Condensed-Matter Dynamics — •W. Götze — Theoretische Physik, Fakultät für Physik, Technische Universität München, D-85747 Garching, Germany — Träger der Max-Planck-Medaille

Complex features of the correlation functions and spectra of glass-forming liquids have been identified during the past two decades by experimental and molecular-dynamics-simulation studies. In order to explain these findings, closed non-linear equations of motion have been motivated for a statistical description of the dynamics of strongly-interacting homogeneous matter, which treat density fluctuations and force fluctuation simultaneously. These equations exhibit bifurcations, which all belong to the class of cuspoid singularities. The basic fold bifurcation describes a transition from the dynamics of a liquid to one of an amorphous solid; it deals with an idealized glass transition. The interplay of non-linearities and diverging retardation effects leads to a scenario for a bifurcation dynamics, which has no analogy to the ones studied in other theories of non-linear motion. The basic features of the scenario will be described. Some examples will be shown, which demonstrate the relation between theory and observations made for cooled liquids, concentrated colloids, and dense polymer melts.