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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: POSTERS Driven Soft Matter

CPP 20.9: Poster

Wednesday, February 27, 2008, 16:00–18:30, Poster A

Fluctuation-dissipation theorem for soft matter systems in shear flow — •Thomas Speck and Udo Seifert — II. Institut für Theoretische Physik, Universität Stuttgart, Germany

In equilibrium, the fluctuation-dissipation theorem (FDT) connects the response of an observable with the time-derivative of the correlation function between this observable and its conjugate with respect to the external perturbation. If we drive the system into a nonequilibrium steady state then entropy will be produced on average and the FDT breaks down. We have shown how to quantify the breakdown of the FDT for a single particle through an additive violation function [1]. We will extend this result to soft matter systems composed of many particles like polymers and colloidal suspensions. As an illustration, we calculate analytically the violation function in the case of a Rouse polymer in simple shear flow.

[1] T. Speck and U. Seifert, Europhys. Lett. 74, 391 (2006).