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DY: Fachverband Dynamik und Statistische Physik

DY 26: Focus Session: Slow Dynamics in Glasses and Granular Matter I (joint session DY/ CPP/ DF)

DY 26.1: Hauptvortrag

Donnerstag, 3. April 2014, 09:30–10:00, HÜL 186

The memory of sand — •Matthieu Wyart — New York University

Complex systems are characterized by an abundance of meta-stable states. To describe such systems statistically, one must understand how states are sampled, a difficult task in general when thermal equilibrium does not apply. This problem arises in various fields of science, and here I will focus on a simple example, sand. Sand can flow until one jammed configuration (among the exponentially many possible ones) is reached. I will argue that these dynamically-accessible configurations are atypical, implying that in its solid phase sand "remembers" that it was flowing just before it jammed. As a consequence, it is stable, but barely so. I will argue that this marginal stability answers long-standing questions both on the solids and liquid phase of granular materials, and will discuss tentatively the applicability of this idea to other systems.