Regensburg 2007 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 16: Poster Session I

BP 16.6: Poster

Dienstag, 27. März 2007, 17:00–19:30, Poster D

Fluctuation-dissipation relation for colloidal particles in shear flow — •Thomas Speck and Udo Seifert — II. Institut für Theoretische Physik, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart

In equilibrium, the well-known fluctuation-dissipation theorem (FDT) connects the response of an observable with its auto-correlation function. For driven systems, breaking of detailed balance leads to dissipation and to the breakdown of the FDT. We have shown recently how to quantify this violation in terms of velocity correlations and how to restore then the original form of the FDT [1]. We investigate the violation function in the case of two interacting colloidal particles driven by shear flow and illustrate our results with numerical calculations.

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